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