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/*
* This program is free software; you can redistribute it and/or modify it under the
* terms of the GNU Lesser General Public License, version 2.1 as published by the Free Software
* Foundation.
*
* You should have received a copy of the GNU Lesser General Public License along with this
* program; if not, you can obtain a copy at http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
* or from the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* This program 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.
*
* Copyright (c) 2006 - 2009 Pentaho Corporation and Contributors. All rights reserved.
*/
package org.pentaho.reporting.libraries.fonts.cache;
import java.util.HashMap;
import org.pentaho.reporting.libraries.fonts.registry.FontKey;
import org.pentaho.reporting.libraries.fonts.registry.FontMetrics;
/**
* The first level font cache is always a perfect cache. It holds all fonts used by the current storage in
* memory. Once finished, the cache-contents are pushed downwards into the second level cache.
*
* @author : Thomas Morgner
*/
public class FirstLevelFontCache implements FontCache
{
private HashMap backend;
private FontCache secondLevelCache;
public FirstLevelFontCache(final FontCache secondLevelCache)
{
this.secondLevelCache = secondLevelCache;
backend = new HashMap();
}
public FontMetrics getFontMetrics(final FontKey fontKey)
{
final FontMetrics metrics = (FontMetrics) backend.get(fontKey);
if (metrics != null)
{
return metrics;
}
if (secondLevelCache == null)
{
return null;
}
final FontMetrics fromSecondLevel = secondLevelCache.getFontMetrics(fontKey);
if (fromSecondLevel != null)
{
backend.put(fontKey.clone(), fromSecondLevel);
return fromSecondLevel;
}
return null;
}
public void putFontMetrics(final FontKey key, final FontMetrics fontMetrics)
{
backend.put(key, fontMetrics);
if (secondLevelCache != null)
{
secondLevelCache.putFontMetrics(key, fontMetrics);
}
}
public void commit()
{
backend.clear();
secondLevelCache = null;
}
}
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