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607 lines
17 KiB
Java
607 lines
17 KiB
Java
// AttributesImpl.java - default implementation of Attributes.
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// Written by David Megginson, sax@megginson.com
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// NO WARRANTY! This class is in the public domain.
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// $Id: AttributesImpl.java,v 1.2 2001/05/31 16:03:17 garyp Exp $
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package org.xml.sax.helpers;
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import org.xml.sax.Attributes;
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/**
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* Default implementation of the Attributes interface.
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*
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* <blockquote>
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* <em>This module, both source code and documentation, is in the
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* Public Domain, and comes with <strong>NO WARRANTY</strong>.</em>
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* </blockquote>
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*
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* <p>This class provides a default implementation of the SAX2
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* {@link org.xml.sax.Attributes Attributes} interface, with the
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* addition of manipulators so that the list can be modified or
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* reused.</p>
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*
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* <p>There are two typical uses of this class:</p>
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*
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* <ol>
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* <li>to take a persistent snapshot of an Attributes object
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* in a {@link org.xml.sax.ContentHandler#startElement startElement} event; or</li>
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* <li>to construct or modify an Attributes object in a SAX2 driver or filter.</li>
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* </ol>
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*
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* <p>This class replaces the now-deprecated SAX1 {@link
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* org.xml.sax.helpers.AttributeListImpl AttributeListImpl}
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* class; in addition to supporting the updated Attributes
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* interface rather than the deprecated {@link org.xml.sax.AttributeList
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* AttributeList} interface, it also includes a much more efficient
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* implementation using a single array rather than a set of Vectors.</p>
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*
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* @since SAX 2.0
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* @author David Megginson,
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* <a href="mailto:sax@megginson.com">sax@megginson.com</a>
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* @version 2.0
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*/
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public class AttributesImpl implements Attributes
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{
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////////////////////////////////////////////////////////////////////
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// Constructors.
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////////////////////////////////////////////////////////////////////
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/**
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* Construct a new, empty AttributesImpl object.
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*/
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public AttributesImpl ()
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{
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length = 0;
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data = null;
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}
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/**
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* Copy an existing Attributes object.
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*
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* <p>This constructor is especially useful inside a
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* {@link org.xml.sax.ContentHandler#startElement startElement} event.</p>
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*
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* @param atts The existing Attributes object.
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*/
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public AttributesImpl (Attributes atts)
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{
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setAttributes(atts);
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}
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////////////////////////////////////////////////////////////////////
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// Implementation of org.xml.sax.Attributes.
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////////////////////////////////////////////////////////////////////
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/**
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* Return the number of attributes in the list.
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*
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* @return The number of attributes in the list.
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* @see org.xml.sax.Attributes#getLength
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*/
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public int getLength ()
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{
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return length;
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}
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/**
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* Return an attribute's Namespace URI.
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*
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* @param index The attribute's index (zero-based).
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* @return The Namespace URI, the empty string if none is
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* available, or null if the index is out of range.
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* @see org.xml.sax.Attributes#getURI
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*/
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public String getURI (int index)
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{
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if (index >= 0 && index < length) {
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return data[index*5];
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} else {
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return null;
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}
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}
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/**
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* Return an attribute's local name.
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*
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* @param index The attribute's index (zero-based).
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* @return The attribute's local name, the empty string if
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* none is available, or null if the index if out of range.
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* @see org.xml.sax.Attributes#getLocalName
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*/
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public String getLocalName (int index)
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{
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if (index >= 0 && index < length) {
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return data[index*5+1];
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} else {
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return null;
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}
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}
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/**
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* Return an attribute's qualified (prefixed) name.
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*
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* @param index The attribute's index (zero-based).
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* @return The attribute's qualified name, the empty string if
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* none is available, or null if the index is out of bounds.
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* @see org.xml.sax.Attributes#getQName
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*/
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public String getQName (int index)
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{
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if (index >= 0 && index < length) {
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return data[index*5+2];
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} else {
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return null;
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}
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}
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/**
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* Return an attribute's type by index.
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*
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* @param index The attribute's index (zero-based).
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* @return The attribute's type, "CDATA" if the type is unknown, or null
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* if the index is out of bounds.
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* @see org.xml.sax.Attributes#getType(int)
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*/
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public String getType (int index)
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{
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if (index >= 0 && index < length) {
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return data[index*5+3];
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} else {
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return null;
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}
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}
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/**
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* Return an attribute's value by index.
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*
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* @param index The attribute's index (zero-based).
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* @return The attribute's value or null if the index is out of bounds.
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* @see org.xml.sax.Attributes#getValue(int)
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*/
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public String getValue (int index)
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{
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if (index >= 0 && index < length) {
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return data[index*5+4];
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} else {
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return null;
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}
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}
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/**
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* Look up an attribute's index by Namespace name.
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*
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* <p>In many cases, it will be more efficient to look up the name once and
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* use the index query methods rather than using the name query methods
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* repeatedly.</p>
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*
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* @param uri The attribute's Namespace URI, or the empty
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* string if none is available.
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* @param localName The attribute's local name.
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* @return The attribute's index, or -1 if none matches.
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* @see org.xml.sax.Attributes#getIndex(java.lang.String,java.lang.String)
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*/
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public int getIndex (String uri, String localName)
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{
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int max = length * 5;
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for (int i = 0; i < max; i += 5) {
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if (data[i].equals(uri) && data[i+1].equals(localName)) {
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return i / 5;
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}
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}
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return -1;
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}
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/**
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* Look up an attribute's index by qualified (prefixed) name.
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*
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* @param qName The qualified name.
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* @return The attribute's index, or -1 if none matches.
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* @see org.xml.sax.Attributes#getIndex(java.lang.String)
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*/
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public int getIndex (String qName)
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{
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int max = length * 5;
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for (int i = 0; i < max; i += 5) {
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if (data[i+2].equals(qName)) {
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return i / 5;
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}
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}
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return -1;
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}
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/**
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* Look up an attribute's type by Namespace-qualified name.
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*
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* @param uri The Namespace URI, or the empty string for a name
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* with no explicit Namespace URI.
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* @param localName The local name.
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* @return The attribute's type, or null if there is no
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* matching attribute.
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* @see org.xml.sax.Attributes#getType(java.lang.String,java.lang.String)
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*/
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public String getType (String uri, String localName)
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{
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int max = length * 5;
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for (int i = 0; i < max; i += 5) {
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if (data[i].equals(uri) && data[i+1].equals(localName)) {
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return data[i+3];
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}
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}
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return null;
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}
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/**
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* Look up an attribute's type by qualified (prefixed) name.
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*
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* @param qName The qualified name.
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* @return The attribute's type, or null if there is no
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* matching attribute.
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* @see org.xml.sax.Attributes#getType(java.lang.String)
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*/
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public String getType (String qName)
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{
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int max = length * 5;
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for (int i = 0; i < max; i += 5) {
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if (data[i+2].equals(qName)) {
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return data[i+3];
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}
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}
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return null;
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}
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/**
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* Look up an attribute's value by Namespace-qualified name.
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*
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* @param uri The Namespace URI, or the empty string for a name
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* with no explicit Namespace URI.
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* @param localName The local name.
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* @return The attribute's value, or null if there is no
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* matching attribute.
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* @see org.xml.sax.Attributes#getValue(java.lang.String,java.lang.String)
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*/
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public String getValue (String uri, String localName)
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{
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int max = length * 5;
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for (int i = 0; i < max; i += 5) {
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if (data[i].equals(uri) && data[i+1].equals(localName)) {
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return data[i+4];
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}
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}
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return null;
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}
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/**
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* Look up an attribute's value by qualified (prefixed) name.
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*
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* @param qName The qualified name.
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* @return The attribute's value, or null if there is no
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* matching attribute.
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* @see org.xml.sax.Attributes#getValue(java.lang.String)
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*/
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public String getValue (String qName)
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{
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int max = length * 5;
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for (int i = 0; i < max; i += 5) {
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if (data[i+2].equals(qName)) {
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return data[i+4];
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}
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}
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return null;
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}
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////////////////////////////////////////////////////////////////////
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// Manipulators.
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////////////////////////////////////////////////////////////////////
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/**
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* Clear the attribute list for reuse.
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*
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* <p>Note that no memory is actually freed by this call:
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* the current arrays are kept so that they can be
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* reused.</p>
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*/
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public void clear ()
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{
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length = 0;
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}
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/**
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* Copy an entire Attributes object.
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*
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* <p>It may be more efficient to reuse an existing object
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* rather than constantly allocating new ones.</p>
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*
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* @param atts The attributes to copy.
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*/
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public void setAttributes (Attributes atts)
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{
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clear();
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length = atts.getLength();
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data = new String[length*5];
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for (int i = 0; i < length; i++) {
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data[i*5] = atts.getURI(i);
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data[i*5+1] = atts.getLocalName(i);
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data[i*5+2] = atts.getQName(i);
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data[i*5+3] = atts.getType(i);
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data[i*5+4] = atts.getValue(i);
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}
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}
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/**
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* Add an attribute to the end of the list.
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*
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* <p>For the sake of speed, this method does no checking
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* to see if the attribute is already in the list: that is
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* the responsibility of the application.</p>
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*
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* @param uri The Namespace URI, or the empty string if
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* none is available or Namespace processing is not
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* being performed.
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* @param localName The local name, or the empty string if
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* Namespace processing is not being performed.
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* @param qName The qualified (prefixed) name, or the empty string
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* if qualified names are not available.
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* @param type The attribute type as a string.
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* @param value The attribute value.
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*/
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public void addAttribute (String uri, String localName, String qName,
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String type, String value)
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{
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ensureCapacity(length+1);
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data[length*5] = uri;
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data[length*5+1] = localName;
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data[length*5+2] = qName;
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data[length*5+3] = type;
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data[length*5+4] = value;
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length++;
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}
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/**
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* Set an attribute in the list.
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*
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* <p>For the sake of speed, this method does no checking
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* for name conflicts or well-formedness: such checks are the
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* responsibility of the application.</p>
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*
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* @param index The index of the attribute (zero-based).
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* @param uri The Namespace URI, or the empty string if
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* none is available or Namespace processing is not
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* being performed.
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* @param localName The local name, or the empty string if
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* Namespace processing is not being performed.
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* @param qName The qualified name, or the empty string
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* if qualified names are not available.
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* @param type The attribute type as a string.
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* @param value The attribute value.
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* @exception java.lang.ArrayIndexOutOfBoundsException When the
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* supplied index does not point to an attribute
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* in the list.
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*/
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public void setAttribute (int index, String uri, String localName,
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String qName, String type, String value)
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{
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if (index >= 0 && index < length) {
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data[index*5] = uri;
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data[index*5+1] = localName;
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data[index*5+2] = qName;
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data[index*5+3] = type;
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data[index*5+4] = value;
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} else {
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badIndex(index);
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}
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}
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/**
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* Remove an attribute from the list.
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*
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* @param index The index of the attribute (zero-based).
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* @exception java.lang.ArrayIndexOutOfBoundsException When the
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* supplied index does not point to an attribute
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* in the list.
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*/
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public void removeAttribute (int index)
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{
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if (index >= 0 && index < length) {
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data[index*5] = null;
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data[index*5+1] = null;
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data[index*5+2] = null;
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data[index*5+3] = null;
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data[index*5+4] = null;
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if (index < length - 1) {
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System.arraycopy(data, (index+1)*5, data, index*5,
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(length-index-1)*5);
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}
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length--;
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} else {
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badIndex(index);
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}
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}
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/**
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* Set the Namespace URI of a specific attribute.
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*
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* @param index The index of the attribute (zero-based).
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* @param uri The attribute's Namespace URI, or the empty
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* string for none.
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* @exception java.lang.ArrayIndexOutOfBoundsException When the
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* supplied index does not point to an attribute
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* in the list.
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*/
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public void setURI (int index, String uri)
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{
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if (index >= 0 && index < length) {
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data[index*5] = uri;
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} else {
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badIndex(index);
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}
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}
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/**
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* Set the local name of a specific attribute.
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*
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* @param index The index of the attribute (zero-based).
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* @param localName The attribute's local name, or the empty
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* string for none.
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* @exception java.lang.ArrayIndexOutOfBoundsException When the
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* supplied index does not point to an attribute
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* in the list.
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*/
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public void setLocalName (int index, String localName)
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{
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if (index >= 0 && index < length) {
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data[index*5+1] = localName;
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} else {
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badIndex(index);
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}
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}
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/**
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* Set the qualified name of a specific attribute.
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*
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* @param index The index of the attribute (zero-based).
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* @param qName The attribute's qualified name, or the empty
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* string for none.
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* @exception java.lang.ArrayIndexOutOfBoundsException When the
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* supplied index does not point to an attribute
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* in the list.
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*/
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public void setQName (int index, String qName)
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{
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if (index >= 0 && index < length) {
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data[index*5+2] = qName;
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} else {
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badIndex(index);
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}
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}
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/**
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* Set the type of a specific attribute.
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*
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* @param index The index of the attribute (zero-based).
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* @param type The attribute's type.
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* @exception java.lang.ArrayIndexOutOfBoundsException When the
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* supplied index does not point to an attribute
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* in the list.
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*/
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public void setType (int index, String type)
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{
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if (index >= 0 && index < length) {
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data[index*5+3] = type;
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} else {
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badIndex(index);
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}
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}
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/**
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* Set the value of a specific attribute.
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*
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* @param index The index of the attribute (zero-based).
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* @param value The attribute's value.
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* @exception java.lang.ArrayIndexOutOfBoundsException When the
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* supplied index does not point to an attribute
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* in the list.
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*/
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public void setValue (int index, String value)
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{
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if (index >= 0 && index < length) {
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data[index*5+4] = value;
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} else {
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badIndex(index);
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}
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}
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////////////////////////////////////////////////////////////////////
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// Internal methods.
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////////////////////////////////////////////////////////////////////
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/**
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* Ensure the internal array's capacity.
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*
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* @param n The minimum number of attributes that the array must
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* be able to hold.
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*/
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private void ensureCapacity (int n)
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{
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if (n > 0 && data == null) {
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data = new String[25];
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}
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int max = data.length;
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if (max >= n * 5) {
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return;
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}
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while (max < n * 5) {
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max *= 2;
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}
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String newData[] = new String[max];
|
||
System.arraycopy(data, 0, newData, 0, length*5);
|
||
data = newData;
|
||
}
|
||
|
||
|
||
/**
|
||
* Report a bad array index in a manipulator.
|
||
*
|
||
* @param index The index to report.
|
||
* @exception java.lang.ArrayIndexOutOfBoundsException Always.
|
||
*/
|
||
private void badIndex (int index)
|
||
throws ArrayIndexOutOfBoundsException
|
||
{
|
||
String msg =
|
||
"Attempt to modify attribute at illegal index: " + index;
|
||
throw new ArrayIndexOutOfBoundsException(msg);
|
||
}
|
||
|
||
|
||
|
||
////////////////////////////////////////////////////////////////////
|
||
// Internal state.
|
||
////////////////////////////////////////////////////////////////////
|
||
|
||
int length;
|
||
String data [];
|
||
|
||
}
|
||
|
||
// end of AttributesImpl.java
|
||
|