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Apache POI - Java API To Access Microsoft Format Files
/* ====================================================================
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.ooxml;
import java.lang.reflect.InvocationTargetException;
import org.apache.poi.openxml4j.exceptions.InvalidFormatException;
import org.apache.poi.openxml4j.opc.PackagePart;
import org.apache.poi.openxml4j.opc.PackageRelationship;
import org.apache.poi.util.POILogFactory;
import org.apache.poi.util.POILogger;
/**
* Defines a factory API that enables sub-classes to create instances of POIXMLDocumentPart
*/
public abstract class POIXMLFactory {
private static final POILogger LOGGER = POILogFactory.getLogger(POIXMLFactory.class);
private static final Class[] PARENT_PART = {POIXMLDocumentPart.class, PackagePart.class};
private static final Class[] ORPHAN_PART = {PackagePart.class};
/**
* Create a POIXMLDocumentPart from existing package part and relation. This method is called
* from {@link POIXMLDocument#load(POIXMLFactory)} when parsing a document
*
* @param parent parent part
* @param part the PackagePart representing the created instance
* @return A new instance of a POIXMLDocumentPart.
*
* @since by POI 3.14-Beta1
*/
public POIXMLDocumentPart createDocumentPart(POIXMLDocumentPart parent, PackagePart part) {
final PackageRelationship rel = getPackageRelationship(parent, part);
final String relType = rel.getRelationshipType();
final POIXMLRelation descriptor = getDescriptor(relType);
// don't parse the document parts, if its class can't be determined
// or if it's a package relation of another embedded resource
if (descriptor == null || descriptor.getRelationClass() == null || POIXMLDocument.PACK_OBJECT_REL_TYPE.equals(relType)) {
LOGGER.log(POILogger.DEBUG, "using default POIXMLDocumentPart for " + rel.getRelationshipType());
return new POIXMLDocumentPart(parent, part);
}
Class cls = descriptor.getRelationClass();
try {
try {
return createDocumentPart(cls, PARENT_PART, new Object[]{parent, part});
} catch (NoSuchMethodException e) {
return createDocumentPart(cls, ORPHAN_PART, new Object[]{part});
}
} catch (Exception e) {
throw new POIXMLException((e.getCause() != null ? e.getCause() : e).getMessage(), e);
}
}
/**
* Need to delegate instantiation to sub class because of constructor visibility
*
* @param cls the document class to be instantiated
* @param classes the classes of the constructor arguments
* @param values the values of the constructor arguments
* @return the new document / part
* @throws SecurityException thrown if the object can't be instantiated
* @throws NoSuchMethodException thrown if there is no constructor found for the given arguments
* @throws InstantiationException thrown if the object can't be instantiated
* @throws IllegalAccessException thrown if the object can't be instantiated
* @throws InvocationTargetException thrown if the object can't be instantiated
*
* @since POI 3.14-Beta1
*/
protected abstract POIXMLDocumentPart createDocumentPart
(Class cls, Class[] classes, Object[] values)
throws SecurityException, NoSuchMethodException, InstantiationException, IllegalAccessException, InvocationTargetException;
/**
* returns the descriptor for the given relationship type
*
* @param relationshipType the relationship type of the descriptor
* @return the descriptor or null if type is unknown
*
* @since POI 3.14-Beta1
*/
protected abstract POIXMLRelation getDescriptor(String relationshipType);
/**
* Create a new POIXMLDocumentPart using the supplied descriptor. This method is used when adding new parts
* to a document, for example, when adding a sheet to a workbook, slide to a presentation, etc.
*
* @param descriptor describes the object to create
* @return A new instance of a POIXMLDocumentPart.
*/
public POIXMLDocumentPart newDocumentPart(POIXMLRelation descriptor) {
Class cls = descriptor.getRelationClass();
try {
return createDocumentPart(cls, null, null);
} catch (Exception e) {
throw new POIXMLException(e);
}
}
/**
* Retrieves the package relationship of the child part within the parent
*
* @param parent the parent to search for the part
* @param part the part to look for
*
* @return the relationship
*
* @throws POIXMLException if the relations are erroneous or the part is not related
*
* @since POI 3.14-Beta1
*/
protected PackageRelationship getPackageRelationship(POIXMLDocumentPart parent, PackagePart part) {
try {
String partName = part.getPartName().getName();
for (PackageRelationship pr : parent.getPackagePart().getRelationships()) {
String packName = pr.getTargetURI().toASCIIString();
if (packName.equalsIgnoreCase(partName)) {
return pr;
}
}
} catch (InvalidFormatException e) {
throw new POIXMLException("error while determining package relations", e);
}
throw new POIXMLException("package part isn't a child of the parent document.");
}
}