org.apache.xmlgraphics.image.loader.impl.DefaultImageSessionContext Maven / Gradle / Ivy
/*
* 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: DefaultImageSessionContext.java 750418 2009-03-05 11:03:54Z vhennebert $ */
package org.apache.xmlgraphics.image.loader.impl;
import java.io.File;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import javax.xml.transform.Source;
import javax.xml.transform.stream.StreamSource;
import org.apache.xmlgraphics.image.loader.ImageContext;
/**
* Very simple implementation of the ImageSessionContext interface. It works for absolute URLs
* and local filenames only. Consider writing your own implementation of the ImageSessionContext
* if you need more sophisticated functionality.
*/
public class DefaultImageSessionContext extends AbstractImageSessionContext {
private ImageContext context;
private File baseDir;
/**
* Main constructor.
* @param context the parent image context
* @param baseDir the base directory for resolving relative filenames
*/
public DefaultImageSessionContext(ImageContext context, File baseDir) {
this.context = context;
this.baseDir = baseDir;
}
/** {@inheritDoc} */
public ImageContext getParentContext() {
return this.context;
}
/**
* Returns the base directory for resolving relative filenames.
* @return the base directory
*/
public File getBaseDir() {
return this.baseDir;
}
/** {@inheritDoc} */
protected Source resolveURI(String uri) {
try {
URL url = new URL(uri);
return new StreamSource(url.openStream(), url.toExternalForm());
} catch (MalformedURLException e) {
File f = new File(baseDir, uri);
if (f.isFile()) {
return new StreamSource(f);
} else {
return null;
}
} catch (IOException ioe) {
return null;
}
}
/** {@inheritDoc} */
public float getTargetResolution() {
return getParentContext().getSourceResolution(); //same as source resolution
}
}