| /* AttributedFormatBuffer.java -- Implements an attributed FormatBuffer. |
| Copyright (C) 2004 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., 51 Franklin Street, Fifth Floor, Boston, MA |
| 02110-1301 USA. |
| |
| Linking this library statically or dynamically with other modules is |
| making a combined work based on this library. Thus, the terms and |
| conditions of the GNU General Public License cover the whole |
| combination. |
| |
| As a special exception, the copyright holders of this library give you |
| permission to link this library with independent modules to produce an |
| executable, regardless of the license terms of these independent |
| modules, and to copy and distribute the resulting executable under |
| terms of your choice, provided that you also meet, for each linked |
| independent module, the terms and conditions of the license of that |
| module. An independent module is a module which is not derived from |
| or based on this library. If you modify this library, you may extend |
| this exception to your version of the library, but you are not |
| obligated to do so. If you do not wish to do so, delete this |
| exception statement from your version. */ |
| package gnu.java.text; |
| |
| import java.text.AttributedCharacterIterator; |
| import java.util.ArrayList; |
| import java.util.HashMap; |
| |
| /** |
| * This class is an implementation of a FormatBuffer with attributes. |
| * |
| * @author Guilhem Lavaux <guilhem@kaffe.org> |
| * @date April 10, 2004 |
| */ |
| public class AttributedFormatBuffer implements FormatBuffer |
| { |
| private StringBuffer buffer; |
| private ArrayList ranges; |
| private ArrayList attributes; |
| private int[] a_ranges; |
| private HashMap[] a_attributes; |
| private int startingRange; |
| AttributedCharacterIterator.Attribute defaultAttr; |
| |
| /** |
| * This constructor accepts a StringBuffer. If the buffer contains |
| * already some characters they will not be attributed. |
| */ |
| public AttributedFormatBuffer(StringBuffer buffer) |
| { |
| this.buffer = buffer; |
| this.ranges = new ArrayList(); |
| this.attributes = new ArrayList(); |
| this.defaultAttr = null; |
| if (buffer.length() != 0) |
| { |
| this.startingRange = buffer.length(); |
| addAttribute(buffer.length(), null); |
| } |
| else |
| this.startingRange = -1; |
| } |
| |
| public AttributedFormatBuffer(int prebuffer) |
| { |
| this(new StringBuffer(prebuffer)); |
| } |
| |
| public AttributedFormatBuffer() |
| { |
| this(10); |
| } |
| |
| /** |
| * This method is a helper function for formatters. Given a set of ranges |
| * and attributes it adds exactly one attribute for the range of characters |
| * comprised between the last entry in 'ranges' and the specified new range. |
| * |
| * @param new_range A new range to insert in the list. |
| * @param new_attribute A new attribute to insert in the list. |
| */ |
| private final void addAttribute(int new_range, AttributedCharacterIterator.Attribute attr) |
| { |
| HashMap map; |
| |
| if (attr != null) |
| { |
| map = new HashMap(); |
| map.put(attr, attr); |
| attributes.add(map); |
| } |
| else |
| attributes.add(null); |
| |
| ranges.add(new Integer(new_range)); |
| } |
| |
| public void append(String s) |
| { |
| if (startingRange < 0) |
| startingRange = 0; |
| buffer.append(s); |
| } |
| |
| public void append(String s, AttributedCharacterIterator.Attribute attr) |
| { |
| setDefaultAttribute(attr); |
| startingRange = buffer.length(); |
| append(s); |
| setDefaultAttribute(null); |
| } |
| |
| public void append(String s, int[] ranges, HashMap[] attrs) |
| { |
| int curPos = buffer.length(); |
| |
| setDefaultAttribute(null); |
| if (ranges != null) |
| { |
| for (int i = 0; i < ranges.length; i++) |
| { |
| this.ranges.add(new Integer(ranges[i] + curPos)); |
| this.attributes.add(attrs[i]); |
| } |
| } |
| startingRange = buffer.length(); |
| buffer.append(s); |
| } |
| |
| public void append(char c) |
| { |
| if (startingRange < 0) |
| startingRange = buffer.length(); |
| buffer.append(c); |
| } |
| |
| public void append(char c, AttributedCharacterIterator.Attribute attr) |
| { |
| setDefaultAttribute(attr); |
| buffer.append(c); |
| setDefaultAttribute(null); |
| } |
| |
| public void setDefaultAttribute(AttributedCharacterIterator.Attribute attr) |
| { |
| if (attr == defaultAttr) |
| return; |
| |
| int currentPos = buffer.length(); |
| |
| if (startingRange != currentPos && startingRange >= 0) |
| { |
| addAttribute(currentPos, defaultAttr); |
| } |
| defaultAttr = attr; |
| startingRange = currentPos; |
| } |
| |
| public AttributedCharacterIterator.Attribute getDefaultAttribute() |
| { |
| return defaultAttr; |
| } |
| |
| public void cutTail(int length) |
| { |
| buffer.setLength(buffer.length()-length); |
| } |
| |
| public int length() |
| { |
| return buffer.length(); |
| } |
| |
| public void clear() |
| { |
| buffer.setLength(0); |
| ranges.clear(); |
| attributes.clear(); |
| defaultAttr = null; |
| startingRange = -1; |
| } |
| |
| /** |
| * This method synchronizes the state of the attribute array. |
| * After calling it you may call {@link #getDefaultAttribute()}. |
| */ |
| public void sync() |
| { |
| if (startingRange < 0 || startingRange == buffer.length()) |
| return; |
| |
| addAttribute(buffer.length(), defaultAttr); |
| |
| a_ranges = new int[ranges.size()]; |
| for (int i = 0; i < a_ranges.length; i++) |
| a_ranges[i] = ((Integer)(ranges.get (i))).intValue(); |
| |
| a_attributes = new HashMap[attributes.size()]; |
| System.arraycopy(attributes.toArray(), 0, a_attributes, 0, a_attributes.length); |
| } |
| |
| /** |
| * This method returns the internal StringBuffer describing |
| * the attributed string. |
| * |
| * @return An instance of StringBuffer which contains the string. |
| */ |
| public StringBuffer getBuffer() |
| { |
| return buffer; |
| } |
| |
| /** |
| * This method returns the ranges for the attributes. |
| * |
| * @return An array of int describing the ranges. |
| */ |
| public int[] getRanges() |
| { |
| return a_ranges; |
| } |
| |
| /** |
| * This method returns the array containing the map on the |
| * attributes. |
| * |
| * @return An array of {@link java.util.Map} containing the attributes. |
| */ |
| public HashMap[] getAttributes() |
| { |
| return a_attributes; |
| } |
| } |