/* ====================================================================
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.
==================================================================== */
package org.apache.poi.openxml4j.opc.internal.marshallers;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URI;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;
import org.apache.poi.openxml4j.exceptions.OpenXML4JException;
import org.apache.poi.openxml4j.opc.PackageNamespaces;
import org.apache.poi.openxml4j.opc.PackagePart;
import org.apache.poi.openxml4j.opc.PackagePartName;
import org.apache.poi.openxml4j.opc.PackageRelationship;
import org.apache.poi.openxml4j.opc.PackageRelationshipCollection;
import org.apache.poi.openxml4j.opc.PackagingURIHelper;
import org.apache.poi.openxml4j.opc.StreamHelper;
import org.apache.poi.openxml4j.opc.TargetMode;
import org.apache.poi.openxml4j.opc.internal.PartMarshaller;
import org.apache.poi.openxml4j.opc.internal.ZipHelper;
import org.apache.poi.util.DocumentHelper;
import org.apache.poi.util.POILogFactory;
import org.apache.poi.util.POILogger;
import org.apache.poi.xssf.usermodel.XSSFRelation;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
/**
* Zip part marshaller. This marshaller is use to save any part in a zip stream.
*/
public final class ZipPartMarshaller implements PartMarshaller {
private final static POILogger logger = POILogFactory.getLogger(ZipPartMarshaller.class);
/**
* Save the specified part.
*
* @throws OpenXML4JException
* Throws if an internal exception is thrown.
*/
@Override
public boolean marshall(PackagePart part, OutputStream os)
throws OpenXML4JException {
if (!(os instanceof ZipOutputStream)) {
logger.log(POILogger.ERROR,"Unexpected class " + os.getClass().getName());
throw new OpenXML4JException("ZipOutputStream expected !");
// Normally should happen only in developement phase, so just throw
// exception
}
// check if there is anything to save for some parts. We don't do this for all parts as some code
// might depend on empty parts being saved, e.g. some unit tests verify this currently.
if(part.getSize() == 0 && part.getPartName().getName().equals(XSSFRelation.SHARED_STRINGS.getDefaultFileName())) {
return true;
}
ZipOutputStream zos = (ZipOutputStream) os;
ZipEntry partEntry = new ZipEntry(ZipHelper
.getZipItemNameFromOPCName(part.getPartName().getURI()
.getPath()));
try {
// Create next zip entry
zos.putNextEntry(partEntry);
// Saving data in the ZIP file
InputStream ins = part.getInputStream();
byte[] buff = new byte[ZipHelper.READ_WRITE_FILE_BUFFER_SIZE];
while (ins.available() > 0) {
int resultRead = ins.read(buff);
if (resultRead == -1) {
// End of file reached
break;
}
zos.write(buff, 0, resultRead);
}
zos.closeEntry();
} catch (IOException ioe) {
logger.log(POILogger.ERROR,"Cannot write: " + part.getPartName() + ": in ZIP",
ioe);
return false;
}
// Saving relationship part
if (part.hasRelationships()) {
PackagePartName relationshipPartName = PackagingURIHelper
.getRelationshipPartName(part.getPartName());
marshallRelationshipPart(part.getRelationships(),
relationshipPartName, zos);
}
return true;
}
/**
* Save relationships into the part.
*
* @param rels
* The relationships collection to marshall.
* @param relPartName
* Part name of the relationship part to marshall.
* @param zos
* Zip output stream in which to save the XML content of the
* relationships serialization.
*/
public static boolean marshallRelationshipPart(
PackageRelationshipCollection rels, PackagePartName relPartName,
ZipOutputStream zos) {
// Building xml
Document xmlOutDoc = DocumentHelper.createDocument();
// make something like <Relationships
// xmlns="http://schemas.openxmlformats.org/package/2006/relationships">
Element root = xmlOutDoc.createElementNS(PackageNamespaces.RELATIONSHIPS, PackageRelationship.RELATIONSHIPS_TAG_NAME);
xmlOutDoc.appendChild(root);
// <Relationship
// TargetMode="External"
// Id="rIdx"
// Target="http://www.custom.com/images/pic1.jpg"
// Type="http://www.custom.com/external-resource"/>
URI sourcePartURI = PackagingURIHelper
.getSourcePartUriFromRelationshipPartUri(relPartName.getURI());
for (PackageRelationship rel : rels) {
// the relationship element
Element relElem = xmlOutDoc.createElementNS(PackageNamespaces.RELATIONSHIPS, PackageRelationship.RELATIONSHIP_TAG_NAME);
root.appendChild(relElem);
// the relationship ID
relElem.setAttribute(PackageRelationship.ID_ATTRIBUTE_NAME, rel.getId());
// the relationship Type
relElem.setAttribute(PackageRelationship.TYPE_ATTRIBUTE_NAME, rel.getRelationshipType());
// the relationship Target
String targetValue;
URI uri = rel.getTargetURI();
if (rel.getTargetMode() == TargetMode.EXTERNAL) {
// Save the target as-is - we don't need to validate it,
// alter it etc
targetValue = uri.toString();
// add TargetMode attribute (as it is external link external)
relElem.setAttribute(PackageRelationship.TARGET_MODE_ATTRIBUTE_NAME, "External");
} else {
URI targetURI = rel.getTargetURI();
targetValue = PackagingURIHelper.relativizeURI(
sourcePartURI, targetURI, true).toString();
}
relElem.setAttribute(PackageRelationship.TARGET_ATTRIBUTE_NAME, targetValue);
}
xmlOutDoc.normalize();
// String schemaFilename = Configuration.getPathForXmlSchema()+
// File.separator + "opc-relationships.xsd";
// Save part in zip
ZipEntry ctEntry = new ZipEntry(ZipHelper.getZipURIFromOPCName(
relPartName.getURI().toASCIIString()).getPath());
try {
zos.putNextEntry(ctEntry);
if (!StreamHelper.saveXmlInStream(xmlOutDoc, zos)) {
return false;
}
zos.closeEntry();
} catch (IOException e) {
logger.log(POILogger.ERROR,"Cannot create zip entry " + relPartName, e);
return false;
}
return true; // success
}
}