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443 lines
14 KiB
Java
443 lines
14 KiB
Java
/* AttributedString.java -- Models text with attributes
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Copyright (C) 1998, 1999 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package java.text;
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import java.util.Iterator;
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import java.util.Hashtable;
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import java.util.HashSet;
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import java.util.Map;
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import java.util.Set;
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/**
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* This class models a <code>String</code> with attributes over various
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* subranges of the string. It allows applications to access this
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* information via the <code>AttributedCharcterIterator</code> interface.
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*
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* @version 0.0
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*
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* @author Aaron M. Renn (arenn@urbanophile.com)
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*/
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public class AttributedString
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{
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/*************************************************************************/
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/*
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* Inner Classes
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*/
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/**
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* This class contains the attributes and ranges of text over which
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* that attributes apply.
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*/
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final class AttributeRange
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{
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/*
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* Instance Variables
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*/
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/**
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* A Map of the attributes
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*/
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Map attribs;
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/**
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* The beginning index of the attributes
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*/
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int begin_index;
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/**
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* The ending index of the attributes
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*/
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int end_index;
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/*************************************************************************/
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/*
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* Constructors
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*/
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AttributeRange(Map attribs, int begin_index, int end_index)
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{
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this.attribs = attribs;
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this.begin_index = begin_index;
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this.end_index = end_index;
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}
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} // Inner class AttributeRange
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/*************************************************************************/
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/*
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* Instance Variables
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*/
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/**
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* This object holds the string we are representing.
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*/
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private StringCharacterIterator sci;
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/**
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* This is the attribute information
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*/
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private AttributeRange[] attribs;
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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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* This method initializes a new instance of <code>AttributedString</code>
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* that represents the specified <code>String</code> with no attributes.
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*
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* @param str The <code>String</code> to be attributed.
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*/
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public
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AttributedString(String str)
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{
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sci = new StringCharacterIterator(str);
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attribs = new AttributeRange[0];
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}
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/*************************************************************************/
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/**
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* This method initializes a new instance of <code>AttributedString</code>
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* that represents that specified <code>String</code> with the specified
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* attributes over the entire length of the <code>String</code>.
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*
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* @param str The <code>String</code> to be attributed.
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* @param attributes The attribute list.
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*/
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public
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AttributedString(String str, Map attributes)
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{
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this(str);
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attribs = new AttributeRange[1];
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attribs[0] = new AttributeRange(attributes, 0, str.length());
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}
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/*************************************************************************/
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/**
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* This method initializes a new instance of <code>AttributedString</code>
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* that will use the text and attribute information from the specified
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* <code>AttributedCharacterIterator</code>.
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*
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* @param aci The <code>AttributedCharacterIterator</code> containing the text and attribute information.
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*/
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public
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AttributedString(AttributedCharacterIterator aci)
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{
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this(aci, aci.getBeginIndex(), aci.getEndIndex(), null);
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}
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/*************************************************************************/
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/**
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* This method initializes a new instance of <code>AttributedString</code>
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* that will use the text and attribute information from the specified
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* subrange of the specified <code>AttributedCharacterIterator</code>.
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*
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* @param aci The <code>AttributedCharacterIterator</code> containing the text and attribute information.
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* @param begin_index The beginning index of the text subrange.
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* @param end_index The ending index of the text subrange.
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*/
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public
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AttributedString(AttributedCharacterIterator aci, int begin_index,
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int end_index)
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{
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this(aci, begin_index, end_index, null);
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}
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/*************************************************************************/
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/**
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* This method initializes a new instance of <code>AttributedString</code>
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* that will use the text and attribute information from the specified
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* subrange of the specified <code>AttributedCharacterIterator</code>.
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* Only attributes from the source iterator that are present in the
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* specified array of attributes will be included in the attribute list
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* for this object.
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*
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* @param aci The <code>AttributedCharacterIterator</code> containing the text and attribute information.
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* @param begin_index The beginning index of the text subrange.
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* @param end_index The ending index of the text subrange.
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* @param attributes A list of attributes to include from the iterator, or <code>null</code> to include all attributes.
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*/
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public
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AttributedString(AttributedCharacterIterator aci, int begin_index,
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int end_index, AttributedCharacterIterator.Attribute[] attributes)
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{
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// Validate some arguments
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if ((begin_index < 0) || (end_index < begin_index))
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throw new IllegalArgumentException("Bad index values");
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StringBuffer sb = new StringBuffer("");
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// Get the valid attribute list
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Set all_attribs = aci.getAllAttributeKeys();
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if (attributes != null)
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{
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Set valid_attribs = new HashSet();
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Iterator iter = all_attribs.iterator();
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while (iter.hasNext())
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{
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Object obj = iter.next();
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int i;
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for (i = 0; i < attributes.length; i++)
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if (obj.equals(attributes[0]))
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break;
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if (i == attributes.length)
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continue;
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valid_attribs.add(obj);
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}
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all_attribs = valid_attribs;
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}
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// Loop through and extract the attributes
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char c = aci.setIndex(begin_index);
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do
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{
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sb.append(c);
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Iterator iter = all_attribs.iterator();
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while(iter.hasNext())
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{
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Object obj = iter.next();
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// What should we do if this is not true?
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if (!(obj instanceof AttributedCharacterIterator.Attribute))
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continue;
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AttributedCharacterIterator.Attribute attrib =
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(AttributedCharacterIterator.Attribute)obj;
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// Make sure the attribute is defined.
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int rl = aci.getRunLimit(attrib);
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if (rl == -1)
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continue;
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if (rl > end_index)
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rl = end_index;
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rl -= begin_index;
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// Check to see if we already processed this one
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int rs = aci.getRunStart(attrib);
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if ((rs < aci.getIndex()) && (aci.getIndex() != begin_index))
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continue;
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// If the attribute run starts before the beginning index, we
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// need to junk it if it is an Annotation.
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Object attrib_obj = aci.getAttribute(attrib);
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if (rs < begin_index)
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{
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if (attrib_obj instanceof Annotation)
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continue;
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rs = begin_index;
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}
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else
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{
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rs -= begin_index;
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}
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// Create a map object. Yes this will only contain one attribute
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Map new_map = new Hashtable();
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new_map.put(attrib, attrib_obj);
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// Add it to the attribute list. Yes this is a bad way to do things.
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AttributeRange[] new_list = new AttributeRange[attribs.length + 1];
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System.arraycopy(attribs, 0, new_list, 0, attribs.length);
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attribs = new_list;
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attribs[attribs.length - 1] = new AttributeRange(new_map, rs, rl);
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}
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c = aci.next();
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}
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while(c != CharacterIterator.DONE);
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sci = new StringCharacterIterator(sb.toString());
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}
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/*************************************************************************/
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/*
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* Instance Methods
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*/
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/**
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* This method adds a new attribute that will cover the entire string.
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*
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* @param attrib The attribute to add.
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* @param value The value of the attribute.
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*/
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public void
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addAttribute(AttributedCharacterIterator.Attribute attrib, Object value)
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{
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addAttribute(attrib, value, 0, sci.getEndIndex() - 1);
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}
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/*************************************************************************/
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/**
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* This method adds a new attribute that will cover the specified subrange
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* of the string.
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*
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* @param attrib The attribute to add.
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* @param value The value of the attribute.
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* @param begin_index The beginning index of the subrange.
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* @param end_index The ending index of the subrange.
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*
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* @exception IllegalArgumentException If attribute is <code>null</code> or the subrange is not valid.
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*/
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public void
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addAttribute(AttributedCharacterIterator.Attribute attrib, Object value,
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int begin_index, int end_index)
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{
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if (attrib == null)
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throw new IllegalArgumentException("null attribute");
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Hashtable ht = new Hashtable();
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ht.put(attrib, value);
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addAttributes(ht, begin_index, end_index);
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}
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/*************************************************************************/
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/**
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* This method adds all of the attributes in the specified list to the
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* specified subrange of the string.
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*
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* @param attributes The list of attributes.
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* @param begin_index The beginning index.
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* @param end_index The ending index
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*
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* @param IllegalArgumentException If the list is <code>null</code> or the subrange is not valid.
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*/
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public void
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addAttributes(Map attributes, int begin_index, int end_index)
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{
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if (attributes == null)
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throw new IllegalArgumentException("null attribute");
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if ((begin_index < 0) || (end_index > sci.getEndIndex()) ||
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(end_index < begin_index))
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throw new IllegalArgumentException("bad range");
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AttributeRange[] new_list = new AttributeRange[attribs.length + 1];
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System.arraycopy(attribs, 0, new_list, 0, attribs.length);
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attribs = new_list;
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attribs[attribs.length - 1] = new AttributeRange(attributes, begin_index,
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end_index);
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}
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/*************************************************************************/
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/**
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* This method returns an <code>AttributedCharacterIterator</code> that
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* will iterate over the entire string.
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*
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* @return An <code>AttributedCharacterIterator</code> for the entire string.
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*/
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public AttributedCharacterIterator
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getIterator()
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{
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return(new AttributedStringIterator(sci, attribs, 0, sci.getEndIndex() - 1,
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null));
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}
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/*************************************************************************/
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/**
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* This method returns an <code>AttributedCharacterIterator</code> that
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* will iterate over the entire string. This iterator will return information
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* about the list of attributes in the specified array. Attributes not in
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* the array may or may not be returned by the iterator. If the specified
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* array is <code>null</code>, all attributes will be returned.
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*
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* @param attributes A list of attributes to include in the returned iterator.
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*
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* @return An <code>AttributedCharacterIterator</code> for this string.
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*/
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public AttributedCharacterIterator
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getIterator(AttributedCharacterIterator.Attribute[] attributes)
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{
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return(getIterator(attributes, 0, sci.getEndIndex() - 1));
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}
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/*************************************************************************/
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/**
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* This method returns an <code>AttributedCharacterIterator</code> that
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* will iterate over the specified subrange. This iterator will return information
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* about the list of attributes in the specified array. Attributes not in
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* the array may or may not be returned by the iterator. If the specified
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* array is <code>null</code>, all attributes will be returned.
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*
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* @param attributes A list of attributes to include in the returned iterator.
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* @param begin_index The beginning index of the subrange.
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* @param end_index The ending index of the subrange.
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*
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* @return An <code>AttributedCharacterIterator</code> for this string.
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*/
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public AttributedCharacterIterator
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getIterator(AttributedCharacterIterator.Attribute[] attributes,
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int begin_index, int end_index)
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{
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if ((begin_index < 0) || (end_index > sci.getEndIndex()) ||
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(end_index < begin_index))
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throw new IllegalArgumentException("bad range");
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return(new AttributedStringIterator(sci, attribs, begin_index, end_index,
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attributes));
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}
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} // class AttributedString
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