net.sf.jasperreports.engine.util.BreakIteratorSplitCharacter.java Source code

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Here is the source code for net.sf.jasperreports.engine.util.BreakIteratorSplitCharacter.java

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/*
 * ============================================================================
 * GNU Lesser General Public License
 * ============================================================================
 *
 * JasperReports - Free Java report-generating library.
 * Copyright (C) 2001-2006 JasperSoft Corporation http://www.jaspersoft.com
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 * 
 * This library 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
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307, USA.
 * 
 * JasperSoft Corporation
 * 303 Second Street, Suite 450 North
 * San Francisco, CA 94107
 * http://www.jaspersoft.com
 */
package net.sf.jasperreports.engine.util;

import java.text.BreakIterator;
import java.text.CharacterIterator;
import java.text.StringCharacterIterator;

import net.sf.jasperreports.engine.JRRuntimeException;

import com.lowagie.text.SplitCharacter;
import com.lowagie.text.pdf.PdfChunk;

/**
 * Implementation of {@link com.lowagie.text.SplitCharacter SplitCharacter} that
 * uses the same logic as AWT to break texts into lines.
 * 
 * @author Lucian Chirita (lucianc@users.sourceforge.net)
 * @version $Id: BreakIteratorSplitCharacter.java 1571 2007-01-29 13:41:53Z lucianc $
 * 
 * @see net.sf.jasperreports.engine.export.JRPdfExporterParameter#FORCE_LINEBREAK_POLICY
 * @see net.sf.jasperreports.engine.util.JRProperties#PDF_FORCE_LINEBREAK_POLICY
 */
public class BreakIteratorSplitCharacter implements SplitCharacter {

    private char[] chars;
    private int start, end;
    private boolean[] boundary;
    private int lastBoundary;
    private final BreakIterator breakIter;

    public BreakIteratorSplitCharacter() {
        this(BreakIterator.getLineInstance());
    }

    public BreakIteratorSplitCharacter(BreakIterator breakIter) {
        this.breakIter = breakIter;
    }

    public boolean isSplitCharacter(int startIdx, int current, int endIdx, char[] cc, PdfChunk[] ck) {
        ++current;
        if (current == endIdx) {
            return false;
        }

        if (!(chars == cc && this.start == startIdx && this.end == endIdx)) {
            chars = cc;
            this.start = startIdx;
            this.end = endIdx;

            breakIter.setText(new ArrayCharIterator(cc, startIdx, endIdx));

            boundary = new boolean[endIdx - startIdx + 1];

            lastBoundary = breakIter.first();
            if (lastBoundary != BreakIterator.DONE) {
                boundary[lastBoundary - startIdx] = true;
            }
        }

        while (current > lastBoundary) {
            lastBoundary = breakIter.next();

            if (lastBoundary == BreakIterator.DONE) {
                lastBoundary = Integer.MAX_VALUE;
            } else {
                boundary[lastBoundary - startIdx] = true;
            }
        }

        return boundary[current - startIdx];
    }

    protected static class ArrayCharIterator implements CharacterIterator {

        private char[] chars;
        private int start;
        private int end;
        private int curr;

        public ArrayCharIterator(char[] chars, int start, int end) {
            this.chars = chars;
            this.start = start;
            this.end = end;
        }

        public char first() {
            curr = start;
            return current();
        }

        public char last() {
            if (end == start) {
                curr = end;
            } else {
                curr = end - 1;
            }
            return current();
        }

        public char setIndex(int position) {
            if (position < start || position > end) {
                throw new JRRuntimeException(
                        "Invalid index " + position + " (start = " + start + ", end = " + end + ")");
            }
            curr = position;
            return current();
        }

        public char current() {
            if (curr < start || curr >= end) {
                return DONE;
            }
            return chars[curr];
        }

        public char next() {
            if (curr >= end - 1) {
                curr = end;
                return DONE;
            }
            curr++;
            return chars[curr];
        }

        public char previous() {
            if (curr <= start) {
                return DONE;
            }
            curr--;
            return chars[curr];
        }

        public int getBeginIndex() {
            return start;
        }

        public int getEndIndex() {
            return end;
        }

        public int getIndex() {
            return curr;
        }

        public Object clone() {
            try {
                StringCharacterIterator other = (StringCharacterIterator) super.clone();
                return other;
            } catch (CloneNotSupportedException e) {
                throw new InternalError();
            }
        }
    }

}