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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.afp;
-
- import java.io.BufferedOutputStream;
- import java.io.IOException;
- import java.io.InputStream;
- import java.io.OutputStream;
- import java.net.URI;
- import java.util.HashMap;
- import java.util.Iterator;
- import java.util.Map;
-
- import org.apache.commons.io.IOUtils;
- import org.apache.commons.logging.Log;
- import org.apache.commons.logging.LogFactory;
-
- import org.apache.fop.afp.modca.ResourceGroup;
- import org.apache.fop.afp.modca.StreamedResourceGroup;
- import org.apache.fop.apps.io.InternalResourceResolver;
- import org.apache.fop.apps.io.TempResourceURIGenerator;
-
- /**
- * 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 DEFAULT_EXTERNAL_RESOURCE_FILENAME = "resources.afp";
-
- private static final TempResourceURIGenerator TEMP_URI_GENERATOR
- = new TempResourceURIGenerator("AFPDataStream_");
-
- private final Factory factory;
-
- private final InternalResourceResolver resourceResolver;
-
- /** A mapping of external resource destinations to resource groups */
- private final Map<URI, ResourceGroup> pathResourceGroupMap = new HashMap<URI, ResourceGroup>();
-
- private StreamedResourceGroup printFileResourceGroup;
-
- /** Sets the default resource group file path */
- private URI defaultResourceGroupUri;
-
- private final URI tempUri;
-
- /** temporary document outputstream */
- private OutputStream tempOutputStream;
-
- /** the final outputstream */
- private OutputStream outputStream;
-
- private DataStream dataStream;
-
- /**
- * Main constructor
- *
- * @param factory a factory
- * @param resourceResolver resource resolver
- */
- public AFPStreamer(Factory factory, InternalResourceResolver resourceResolver) {
- this.factory = factory;
- this.resourceResolver = resourceResolver;
- this.tempUri = TEMP_URI_GENERATOR.generate();
- defaultResourceGroupUri = URI.create(DEFAULT_EXTERNAL_RESOURCE_FILENAME);
-
- }
-
- /**
- * Creates a new DataStream
- *
- * @param paintingState the AFP painting state
- * @return a new {@link DataStream}
- * @throws IOException thrown if an I/O exception of some sort has occurred
- */
- public DataStream createDataStream(AFPPaintingState paintingState) throws IOException {
- this.tempOutputStream = new BufferedOutputStream(resourceResolver.getOutputStream(tempUri));
- this.dataStream = factory.createDataStream(paintingState, tempOutputStream);
- return dataStream;
- }
-
- /**
- * Sets the default resource group file path
- *
- * @param filePath the default resource group file path
- */
- public void setDefaultResourceGroupUri(URI uri) {
- this.defaultResourceGroupUri = uri;
- }
-
- /**
- * 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()) {
- URI uri = level.getExternalURI();
- if (uri == null) {
- LOG.warn("No file path provided for external resource, using default.");
- uri = defaultResourceGroupUri;
- }
- resourceGroup = pathResourceGroupMap.get(uri);
- if (resourceGroup == null) {
- OutputStream os = null;
- try {
- os = new BufferedOutputStream(resourceResolver.getOutputStream(uri));
- } catch (IOException ioe) {
- LOG.error("Failed to create/open external resource group for uri '"
- + uri + "'");
- } finally {
- if (os != null) {
- resourceGroup = factory.createStreamedResourceGroup(os);
- pathResourceGroupMap.put(uri, 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
- */
- // write out any external resource groups
- public void close() throws IOException {
- Iterator it = pathResourceGroupMap.values().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();
- }
-
- /**
- * Sets the final outputstream
- *
- * @param outputStream an outputstream
- */
- public void setOutputStream(OutputStream outputStream) {
- this.outputStream = outputStream;
- }
-
- /** {@inheritDoc} */
- public void writeToStream(OutputStream os) throws IOException {
- tempOutputStream.close();
- InputStream tempInputStream = resourceResolver.getResource(tempUri);
- IOUtils.copy(tempInputStream, os);
- //TODO this should notify the stream provider that it is safe to delete the temp data
- tempInputStream.close();
- os.flush();
- }
- }
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