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/*
* 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: $ */
package org.apache.fop.render.afp;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.RandomAccessFile;
import java.util.Iterator;
import java.util.Map;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.fop.render.afp.modca.DataStream;
import org.apache.fop.render.afp.modca.Factory;
import org.apache.fop.render.afp.modca.ResourceGroup;
import org.apache.fop.render.afp.modca.StreamedResourceGroup;
/**
* Manages the streaming of the AFP output
*/
public class AFPStreamer implements Streamable {
/** Static logging instance */
private static final Log log = LogFactory.getLog(AFPStreamer.class);
private static final String AFPDATASTREAM_TEMP_FILE_PREFIX = "AFPDataStream_";
private static final int BUFFER_SIZE = 4096;
private static final String DEFAULT_EXTERNAL_RESOURCE_FILENAME = "resources.afp";
private final Factory factory;
/** A mapping of external resource destinations to resource groups */
private final Map/*<String,AFPExternalResourceGroup>*/pathResourceGroupMap
= new java.util.HashMap/*<String,AFPExternalResourceGroup>*/();
private StreamedResourceGroup printFileResourceGroup;
/** Sets the default resource group file path */
private String defaultResourceGroupFilePath = DEFAULT_EXTERNAL_RESOURCE_FILENAME;
private File tempFile;
/** temporary document outputstream */
private OutputStream documentOutputStream;
/** the final outputstream */
private OutputStream outputStream;
private RandomAccessFile documentFile;
private DataStream dataStream;
/**
* Main constructor
*
* @param factory a factory
*/
public AFPStreamer(Factory factory) {
this.factory = factory;
}
/**
* Creates a new DataStream
*
* @return a new {@link DataStream}
*/
public DataStream createDataStream() {
try {
this.tempFile = File.createTempFile(AFPDATASTREAM_TEMP_FILE_PREFIX, null);
this.documentFile = new RandomAccessFile(tempFile, "rw");
this.documentOutputStream = new BufferedOutputStream(
new FileOutputStream(documentFile.getFD()));
this.dataStream = factory.createDataStream(documentOutputStream);
} catch (IOException e) {
log.error(e.getMessage());
}
return dataStream;
}
/**
* Sets the default resource group file path
*
* @param filePath the default resource group file path
*/
public void setDefaultResourceGroupFilePath(String filePath) {
this.defaultResourceGroupFilePath = filePath;
}
/**
* Returns the resource group for a given resource info
*
* @param level a resource level
* @return a resource group for the given resource info
*/
public ResourceGroup getResourceGroup(AFPResourceLevel level) {
ResourceGroup resourceGroup = null;
if (level.isInline()) { // no resource group for inline level
return null;
}
if (level.isExternal()) {
String filePath = level.getExternalFilePath();
if (filePath == null) {
log.warn("No file path provided for external resource, using default.");
filePath = defaultResourceGroupFilePath;
}
resourceGroup = (ResourceGroup)pathResourceGroupMap.get(filePath);
if (resourceGroup == null) {
OutputStream os = null;
try {
os = new BufferedOutputStream(new FileOutputStream(filePath));
} catch (FileNotFoundException fnfe) {
log.error("Failed to create/open external resource group file '"
+ filePath + "'");
} finally {
if (os != null) {
resourceGroup = factory.createStreamedResourceGroup(os);
pathResourceGroupMap.put(filePath, resourceGroup);
}
}
}
} else if (level.isPrintFile()) {
if (printFileResourceGroup == null) {
// use final outputstream for print-file resource group
printFileResourceGroup = factory.createStreamedResourceGroup(outputStream);
}
resourceGroup = printFileResourceGroup;
} else {
// resource group in afp document datastream
resourceGroup = dataStream.getResourceGroup(level);
}
return resourceGroup;
}
/**
* Closes off the AFP stream writing the document stream
*
* @throws IOException if an an I/O exception of some sort has occurred
*/
public void close() throws IOException {
// write out any external resource groups
Iterator it = pathResourceGroupMap.entrySet().iterator();
while (it.hasNext()) {
StreamedResourceGroup resourceGroup = (StreamedResourceGroup)it.next();
resourceGroup.close();
}
// close any open print-file resource group
if (printFileResourceGroup != null) {
printFileResourceGroup.close();
}
// write out document
writeToStream(outputStream);
outputStream.close();
// delete temporary file
tempFile.delete();
}
/**
* Sets the final outputstream
*
* @param outputStream an outputstream
*/
public void setOutputStream(OutputStream outputStream) {
this.outputStream = outputStream;
}
/** {@inheritDoc} */
public void writeToStream(OutputStream os) throws IOException {
int len = (int)documentFile.length();
int numChunks = len / BUFFER_SIZE;
int remainingChunkSize = len % BUFFER_SIZE;
byte[] buffer;
documentFile.seek(0);
if (numChunks > 0) {
buffer = new byte[BUFFER_SIZE];
for (int i = 0; i < numChunks; i++) {
documentFile.read(buffer, 0, BUFFER_SIZE);
os.write(buffer, 0, BUFFER_SIZE);
}
} else {
buffer = new byte[remainingChunkSize];
}
if (remainingChunkSize > 0) {
documentFile.read(buffer, 0, remainingChunkSize);
os.write(buffer, 0, remainingChunkSize);
}
os.flush();
}
}
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