/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/* $Id: ColorSpaceCache.java 679326 2008-07-24 09:35:34Z vhennebert $ */
package org.apache.fop.util;
import java.awt.color.ColorSpace;
import java.awt.color.ICC_ColorSpace;
import java.awt.color.ICC_Profile;
import java.util.Collections;
import java.util.Map;
import javax.xml.transform.Source;
import javax.xml.transform.URIResolver;
import javax.xml.transform.stream.StreamSource;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
/**
* Map with cached ICC based ColorSpace objects.
*/
public class ColorSpaceCache {
/** logger instance */
private static Log log = LogFactory.getLog(ColorSpaceCache.class);
private URIResolver resolver;
private Map colorSpaceMap = Collections.synchronizedMap(new java.util.HashMap());
/**
* Default constructor
* @param resolver uri resolver
*/
public ColorSpaceCache(URIResolver resolver) {
this.resolver = resolver;
}
/**
* Create (if needed) and return an ICC ColorSpace instance.
*
* The ICC profile source is taken from the src attribute of the color-profile FO element.
* If the ICC ColorSpace is not yet in the cache a new one is created and stored in the cache.
*
* The FOP URI resolver is used to try and locate the ICC file.
* If that fails null is returned.
*
* @param base a base URI to resolve relative URIs
* @param iccProfileSrc ICC Profile source to return a ColorSpace for
* @return ICC ColorSpace object or null if ColorSpace could not be created
*/
public ColorSpace get(String base, String iccProfileSrc) {
ColorSpace colorSpace = null;
if (!colorSpaceMap.containsKey(base + iccProfileSrc)) {
try {
ICC_Profile iccProfile = null;
// First attempt to use the FOP URI resolver to locate the ICC
// profile
Source src = resolver.resolve(iccProfileSrc, base);
if (src != null && src instanceof StreamSource) {
// FOP URI resolver found ICC profile - create ICC profile
// from the Source
iccProfile = ICC_Profile.getInstance(((StreamSource) src)
.getInputStream());
} else {
// TODO - Would it make sense to fall back on VM ICC
// resolution
// Problem is the cache might be more difficult to maintain
//
// FOP URI resolver did not find ICC profile - perhaps the
// Java VM can find it?
// iccProfile = ICC_Profile.getInstance(iccProfileSrc);
}
if (iccProfile != null) {
colorSpace = new ICC_ColorSpace(iccProfile);
}
} catch (Exception e) {
// Ignore exception - will be logged a bit further down
// (colorSpace == null case)
}
if (colorSpace != null) {
// Put in cache (not when VM resolved it as we can't control
colorSpaceMap.put(base + iccProfileSrc, colorSpace);
} else {
// TODO To avoid an excessive amount of warnings perhaps
// register a null ColorMap in the colorSpaceMap
log.warn("Color profile '" + iccProfileSrc + "' not found.");
}
} else {
colorSpace = (ColorSpace)colorSpaceMap.get(base
+ iccProfileSrc);
}
return colorSpace;
}
}