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322 lines
9.4 KiB
Java
322 lines
9.4 KiB
Java
// SAX input source.
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// No warranty; no copyright -- use this as you will.
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// $Id: InputSource.java,v 1.1 2000/10/02 02:43:17 sboag Exp $
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package org.xml.sax;
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import java.io.Reader;
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import java.io.InputStream;
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/**
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* A single input source for an XML entity.
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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 allows a SAX application to encapsulate information
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* about an input source in a single object, which may include
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* a public identifier, a system identifier, a byte stream (possibly
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* with a specified encoding), and/or a character stream.</p>
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*
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* <p>There are two places that the application will deliver this
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* input source to the parser: as the argument to the Parser.parse
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* method, or as the return value of the EntityResolver.resolveEntity
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* method.</p>
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*
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* <p>The SAX parser will use the InputSource object to determine how
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* to read XML input. If there is a character stream available, the
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* parser will read that stream directly; if not, the parser will use
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* a byte stream, if available; if neither a character stream nor a
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* byte stream is available, the parser will attempt to open a URI
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* connection to the resource identified by the system
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* identifier.</p>
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*
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* <p>An InputSource object belongs to the application: the SAX parser
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* shall never modify it in any way (it may modify a copy if
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* necessary).</p>
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*
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* @since SAX 1.0
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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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* @see org.xml.sax.Parser#parse
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* @see org.xml.sax.EntityResolver#resolveEntity
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* @see java.io.InputStream
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* @see java.io.Reader
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*/
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public class InputSource {
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/**
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* Zero-argument default constructor.
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*
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* @see #setPublicId
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* @see #setSystemId
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* @see #setByteStream
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* @see #setCharacterStream
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* @see #setEncoding
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*/
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public InputSource ()
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{
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}
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/**
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* Create a new input source with a system identifier.
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*
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* <p>Applications may use setPublicId to include a
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* public identifier as well, or setEncoding to specify
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* the character encoding, if known.</p>
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*
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* <p>If the system identifier is a URL, it must be full resolved.</p>
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*
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* @param systemId The system identifier (URI).
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* @see #setPublicId
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* @see #setSystemId
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* @see #setByteStream
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* @see #setEncoding
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* @see #setCharacterStream
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*/
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public InputSource (String systemId)
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{
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setSystemId(systemId);
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}
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/**
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* Create a new input source with a byte stream.
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*
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* <p>Application writers may use setSystemId to provide a base
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* for resolving relative URIs, setPublicId to include a
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* public identifier, and/or setEncoding to specify the object's
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* character encoding.</p>
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*
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* @param byteStream The raw byte stream containing the document.
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* @see #setPublicId
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* @see #setSystemId
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* @see #setEncoding
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* @see #setByteStream
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* @see #setCharacterStream
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*/
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public InputSource (InputStream byteStream)
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{
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setByteStream(byteStream);
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}
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/**
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* Create a new input source with a character stream.
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*
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* <p>Application writers may use setSystemId() to provide a base
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* for resolving relative URIs, and setPublicId to include a
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* public identifier.</p>
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*
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* <p>The character stream shall not include a byte order mark.</p>
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*
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* @see #setPublicId
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* @see #setSystemId
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* @see #setByteStream
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* @see #setCharacterStream
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*/
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public InputSource (Reader characterStream)
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{
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setCharacterStream(characterStream);
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}
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/**
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* Set the public identifier for this input source.
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*
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* <p>The public identifier is always optional: if the application
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* writer includes one, it will be provided as part of the
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* location information.</p>
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*
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* @param publicId The public identifier as a string.
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* @see #getPublicId
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* @see org.xml.sax.Locator#getPublicId
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* @see org.xml.sax.SAXParseException#getPublicId
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*/
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public void setPublicId (String publicId)
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{
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this.publicId = publicId;
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}
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/**
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* Get the public identifier for this input source.
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*
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* @return The public identifier, or null if none was supplied.
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* @see #setPublicId
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*/
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public String getPublicId ()
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{
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return publicId;
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}
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/**
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* Set the system identifier for this input source.
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*
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* <p>The system identifier is optional if there is a byte stream
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* or a character stream, but it is still useful to provide one,
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* since the application can use it to resolve relative URIs
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* and can include it in error messages and warnings (the parser
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* will attempt to open a connection to the URI only if
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* there is no byte stream or character stream specified).</p>
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*
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* <p>If the application knows the character encoding of the
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* object pointed to by the system identifier, it can register
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* the encoding using the setEncoding method.</p>
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*
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* <p>If the system ID is a URL, it must be fully resolved.</p>
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*
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* @param systemId The system identifier as a string.
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* @see #setEncoding
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* @see #getSystemId
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* @see org.xml.sax.Locator#getSystemId
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* @see org.xml.sax.SAXParseException#getSystemId
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*/
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public void setSystemId (String systemId)
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{
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this.systemId = systemId;
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}
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/**
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* Get the system identifier for this input source.
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*
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* <p>The getEncoding method will return the character encoding
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* of the object pointed to, or null if unknown.</p>
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*
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* <p>If the system ID is a URL, it will be fully resolved.</p>
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*
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* @return The system identifier.
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* @see #setSystemId
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* @see #getEncoding
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*/
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public String getSystemId ()
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{
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return systemId;
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}
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/**
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* Set the byte stream for this input source.
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*
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* <p>The SAX parser will ignore this if there is also a character
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* stream specified, but it will use a byte stream in preference
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* to opening a URI connection itself.</p>
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*
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* <p>If the application knows the character encoding of the
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* byte stream, it should set it with the setEncoding method.</p>
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*
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* @param byteStream A byte stream containing an XML document or
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* other entity.
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* @see #setEncoding
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* @see #getByteStream
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* @see #getEncoding
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* @see java.io.InputStream
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*/
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public void setByteStream (InputStream byteStream)
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{
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this.byteStream = byteStream;
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}
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/**
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* Get the byte stream for this input source.
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*
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* <p>The getEncoding method will return the character
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* encoding for this byte stream, or null if unknown.</p>
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*
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* @return The byte stream, or null if none was supplied.
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* @see #getEncoding
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* @see #setByteStream
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*/
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public InputStream getByteStream ()
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{
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return byteStream;
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}
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/**
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* Set the character encoding, if known.
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*
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* <p>The encoding must be a string acceptable for an
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* XML encoding declaration (see section 4.3.3 of the XML 1.0
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* recommendation).</p>
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*
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* <p>This method has no effect when the application provides a
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* character stream.</p>
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*
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* @param encoding A string describing the character encoding.
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* @see #setSystemId
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* @see #setByteStream
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* @see #getEncoding
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*/
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public void setEncoding (String encoding)
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{
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this.encoding = encoding;
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}
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/**
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* Get the character encoding for a byte stream or URI.
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*
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* @return The encoding, or null if none was supplied.
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* @see #setByteStream
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* @see #getSystemId
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* @see #getByteStream
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*/
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public String getEncoding ()
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{
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return encoding;
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}
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/**
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* Set the character stream for this input source.
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*
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* <p>If there is a character stream specified, the SAX parser
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* will ignore any byte stream and will not attempt to open
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* a URI connection to the system identifier.</p>
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*
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* @param characterStream The character stream containing the
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* XML document or other entity.
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* @see #getCharacterStream
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* @see java.io.Reader
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*/
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public void setCharacterStream (Reader characterStream)
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{
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this.characterStream = characterStream;
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}
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/**
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* Get the character stream for this input source.
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*
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* @return The character stream, or null if none was supplied.
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* @see #setCharacterStream
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*/
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public Reader getCharacterStream ()
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{
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return characterStream;
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}
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////////////////////////////////////////////////////////////////////
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// Internal state.
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////////////////////////////////////////////////////////////////////
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private String publicId;
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private String systemId;
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private InputStream byteStream;
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private String encoding;
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private Reader characterStream;
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}
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// end of InputSource.java
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