net.sf.jasperreports.engine.util.text.LegacyTextLayoutAssessor Maven / Gradle / Ivy
/*
* JasperReports - Free Java Reporting Library.
* Copyright (C) 2001 - 2023 Cloud Software Group, Inc. All rights reserved.
* http://www.jaspersoft.com
*
* Unless you have purchased a commercial license agreement from Jaspersoft,
* the following license terms apply:
*
* This program is part of JasperReports.
*
* JasperReports 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 3 of the License, or
* (at your option) any later version.
*
* JasperReports 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 JasperReports. If not, see .
*/
package net.sf.jasperreports.engine.util.text;
import java.lang.Character.UnicodeBlock;
import java.util.HashSet;
import java.util.Set;
/**
* Legacy complex text layout implementation.
*
* @author Lucian Chirita ([email protected])
*/
public class LegacyTextLayoutAssessor implements TextLayoutAssessor
{
protected static final int COMPEX_LAYOUT_START_CHAR = 0x0300;// got this from sun.font.FontUtilities
protected static final int COMPEX_LAYOUT_END_CHAR = 0x206F;// got this from sun.font.FontUtilities
protected static final Set simpleLayoutBlocks;
static
{
// white list of Unicode blocks that have simple text layout
simpleLayoutBlocks = new HashSet<>();
// got these from sun.font.FontUtilities, but the list is not exhaustive
simpleLayoutBlocks.add(Character.UnicodeBlock.GREEK);
simpleLayoutBlocks.add(Character.UnicodeBlock.CYRILLIC);
simpleLayoutBlocks.add(Character.UnicodeBlock.CYRILLIC_SUPPLEMENTARY);
simpleLayoutBlocks.add(Character.UnicodeBlock.ARMENIAN);
simpleLayoutBlocks.add(Character.UnicodeBlock.SYRIAC);
simpleLayoutBlocks.add(Character.UnicodeBlock.THAANA);
simpleLayoutBlocks.add(Character.UnicodeBlock.MYANMAR);
simpleLayoutBlocks.add(Character.UnicodeBlock.GEORGIAN);
simpleLayoutBlocks.add(Character.UnicodeBlock.ETHIOPIC);
simpleLayoutBlocks.add(Character.UnicodeBlock.TAGALOG);
simpleLayoutBlocks.add(Character.UnicodeBlock.MONGOLIAN);
simpleLayoutBlocks.add(Character.UnicodeBlock.LATIN_EXTENDED_ADDITIONAL);
simpleLayoutBlocks.add(Character.UnicodeBlock.GREEK_EXTENDED);
}
@Override
public boolean hasComplexLayout(char[] chars)
{
UnicodeBlock prevBlock = null;
for (int i = 0; i < chars.length; i++)
{
char ch = chars[i];
if (ch >= COMPEX_LAYOUT_START_CHAR && ch <= COMPEX_LAYOUT_END_CHAR)
{
//FIXME use icu4j or CharPredicateCache
UnicodeBlock chBlock = Character.UnicodeBlock.of(ch);
if (chBlock == null)
{
// being conservative
return true;
}
// if the same block as the previous block, avoid going to the hash set
// this could offer some speed improvement
if (prevBlock != chBlock)
{
prevBlock = chBlock;
if (!simpleLayoutBlocks.contains(chBlock))
{
return true;
}
}
}
}
return false;
}
}