org.apache.poi.POIXMLDocumentPart Maven / Gradle / Ivy
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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
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http://www.apache.org/licenses/LICENSE-2.0
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package org.apache.poi;
import java.io.IOException;
import java.net.URI;
import java.util.ArrayList;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.apache.poi.openxml4j.exceptions.InvalidFormatException;
import org.apache.poi.openxml4j.exceptions.OpenXML4JException;
import org.apache.poi.openxml4j.exceptions.PartAlreadyExistsException;
import org.apache.poi.openxml4j.opc.OPCPackage;
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.PackageRelationshipTypes;
import org.apache.poi.openxml4j.opc.PackagingURIHelper;
import org.apache.poi.openxml4j.opc.TargetMode;
import org.apache.poi.util.Internal;
import org.apache.poi.util.POILogFactory;
import org.apache.poi.util.POILogger;
import org.apache.poi.xssf.usermodel.XSSFRelation;
/**
* Represents an entry of a OOXML package.
*
*
* Each POIXMLDocumentPart keeps a reference to the underlying a {@link org.apache.poi.openxml4j.opc.PackagePart}.
*
*/
public class POIXMLDocumentPart {
private static final POILogger logger = POILogFactory.getLogger(POIXMLDocumentPart.class);
private String coreDocumentRel = PackageRelationshipTypes.CORE_DOCUMENT;
private PackagePart packagePart;
private POIXMLDocumentPart parent;
private Map relations = new LinkedHashMap();
/**
* The RelationPart is a cached relationship between the document, which contains the RelationPart,
* and one of its referenced child document parts.
* The child document parts may only belong to one parent, but it's often referenced by other
* parents too, having varying {@link PackageRelationship#getId() relationship ids} pointing to it.
*/
public static class RelationPart {
private final PackageRelationship relationship;
private final POIXMLDocumentPart documentPart;
RelationPart(PackageRelationship relationship, POIXMLDocumentPart documentPart) {
this.relationship = relationship;
this.documentPart = documentPart;
}
/**
* @return the cached relationship, which uniquely identifies this child document part within the parent
*/
public PackageRelationship getRelationship() {
return relationship;
}
/**
* @param the cast of the caller to a document sub class
*
* @return the child document part
*/
@SuppressWarnings("unchecked")
public T getDocumentPart() {
return (T)documentPart;
}
}
/**
* Counter that provides the amount of incoming relations from other parts
* to this part.
*/
private int relationCounter = 0;
int incrementRelationCounter() {
relationCounter++;
return relationCounter;
}
int decrementRelationCounter() {
relationCounter--;
return relationCounter;
}
int getRelationCounter() {
return relationCounter;
}
/**
* Construct POIXMLDocumentPart representing a "core document" package part.
*
* @param pkg the OPCPackage containing this document
*/
public POIXMLDocumentPart(OPCPackage pkg) {
this(pkg, PackageRelationshipTypes.CORE_DOCUMENT);
}
/**
* Construct POIXMLDocumentPart representing a custom "core document" package part.
*
* @param pkg the OPCPackage containing this document
* @param coreDocumentRel the relation type of this document
*/
public POIXMLDocumentPart(OPCPackage pkg, String coreDocumentRel) {
this(getPartFromOPCPackage(pkg, coreDocumentRel));
this.coreDocumentRel = coreDocumentRel;
}
/**
* Creates new POIXMLDocumentPart - called by client code to create new parts from scratch.
*
* @see #createRelationship(POIXMLRelation, POIXMLFactory, int, boolean)
*/
public POIXMLDocumentPart() {
}
/**
* Creates an POIXMLDocumentPart representing the given package part and relationship.
* Called by {@link #read(POIXMLFactory, java.util.Map)} when reading in an existing file.
*
* @param part - The package part that holds xml data representing this sheet.
* @see #read(POIXMLFactory, java.util.Map)
*
* @since POI 3.14-Beta1
*/
public POIXMLDocumentPart(PackagePart part) {
this(null, part);
}
/**
* Creates an POIXMLDocumentPart representing the given package part, relationship and parent
* Called by {@link #read(POIXMLFactory, java.util.Map)} when reading in an existing file.
*
* @param parent - Parent part
* @param part - The package part that holds xml data representing this sheet.
* @see #read(POIXMLFactory, java.util.Map)
*
* @since POI 3.14-Beta1
*/
public POIXMLDocumentPart(POIXMLDocumentPart parent, PackagePart part) {
this.packagePart = part;
this.parent = parent;
}
/**
* When you open something like a theme, call this to
* re-base the XML Document onto the core child of the
* current core document
*
* @param pkg the package to be rebased
*
* @throws InvalidFormatException if there was an error in the core document relation
* @throws IllegalStateException if there are more than one core document relations
*/
protected final void rebase(OPCPackage pkg) throws InvalidFormatException {
PackageRelationshipCollection cores =
packagePart.getRelationshipsByType(coreDocumentRel);
if(cores.size() != 1) {
throw new IllegalStateException(
"Tried to rebase using " + coreDocumentRel +
" but found " + cores.size() + " parts of the right type"
);
}
packagePart = packagePart.getRelatedPart(cores.getRelationship(0));
}
/**
* Provides access to the underlying PackagePart
*
* @return the underlying PackagePart
*/
public final PackagePart getPackagePart(){
return packagePart;
}
/**
* Returns the list of child relations for this POIXMLDocumentPart
*
* @return child relations
*/
public final List getRelations(){
List l = new ArrayList();
for (RelationPart rp : relations.values()) {
l.add(rp.getDocumentPart());
}
return Collections.unmodifiableList(l);
}
/**
* Returns the list of child relations for this POIXMLDocumentPart
*
* @return child relations
*/
public final List getRelationParts() {
List l = new ArrayList(relations.values());
return Collections.unmodifiableList(l);
}
/**
* Returns the target {@link POIXMLDocumentPart}, where a
* {@link PackageRelationship} is set from the {@link PackagePart} of this
* {@link POIXMLDocumentPart} to the {@link PackagePart} of the target
* {@link POIXMLDocumentPart} with a {@link PackageRelationship#getId()}
* matching the given parameter value.
*
* @param id
* The relation id to look for
* @return the target part of the relation, or null, if none exists
*/
public final POIXMLDocumentPart getRelationById(String id) {
RelationPart rp = relations.get(id);
return (rp == null) ? null : rp.getDocumentPart();
}
/**
* Returns the {@link PackageRelationship#getId()} of the
* {@link PackageRelationship}, that sources from the {@link PackagePart} of
* this {@link POIXMLDocumentPart} to the {@link PackagePart} of the given
* parameter value.
*
* @param part
* The {@link POIXMLDocumentPart} for which the according
* relation-id shall be found.
* @return The value of the {@link PackageRelationship#getId()} or null, if
* parts are not related.
*/
public final String getRelationId(POIXMLDocumentPart part) {
for (RelationPart rp : relations.values()) {
if (rp.getDocumentPart() == part) {
return rp.getRelationship().getId();
}
}
return null;
}
/**
* Add a new child POIXMLDocumentPart
*
* @param relId the preferred relation id, when null the next free relation id will be used
* @param relationshipType the package relationship type
* @param part the child to add
*
* @return the new RelationPart
*
* @since 3.14-Beta1
*/
public final RelationPart addRelation(String relId, POIXMLRelation relationshipType, POIXMLDocumentPart part) {
PackageRelationship pr = this.packagePart.findExistingRelation(part.getPackagePart());
if (pr == null) {
PackagePartName ppn = part.getPackagePart().getPartName();
String relType = relationshipType.getRelation();
pr = packagePart.addRelationship(ppn, TargetMode.INTERNAL, relType, relId);
}
addRelation(pr, part);
return new RelationPart(pr, part);
}
/**
* Add a new child POIXMLDocumentPart
*
* @param pr the relationship of the child
* @param part the child to add
*/
private void addRelation(PackageRelationship pr, POIXMLDocumentPart part) {
relations.put(pr.getId(), new RelationPart(pr,part));
part.incrementRelationCounter();
}
/**
* Remove the relation to the specified part in this package and remove the
* part, if it is no longer needed.
*
* @param part the part which relation is to be removed from this document
*/
protected final void removeRelation(POIXMLDocumentPart part){
removeRelation(part,true);
}
/**
* Remove the relation to the specified part in this package and remove the
* part, if it is no longer needed and flag is set to true.
*
* @param part
* The related part, to which the relation shall be removed.
* @param removeUnusedParts
* true, if the part shall be removed from the package if not
* needed any longer.
* @return true, if the relation was removed
*/
protected final boolean removeRelation(POIXMLDocumentPart part, boolean removeUnusedParts){
String id = getRelationId(part);
if (id == null) {
// part is not related with this POIXMLDocumentPart
return false;
}
/* decrement usage counter */
part.decrementRelationCounter();
/* remove packagepart relationship */
getPackagePart().removeRelationship(id);
/* remove POIXMLDocument from relations */
relations.remove(id);
if (removeUnusedParts) {
/* if last relation to target part was removed, delete according target part */
if (part.getRelationCounter() == 0) {
try {
part.onDocumentRemove();
} catch (IOException e) {
throw new POIXMLException(e);
}
getPackagePart().getPackage().removePart(part.getPackagePart());
}
}
return true;
}
/**
* Returns the parent POIXMLDocumentPart. All parts except root have not-null parent.
*
* @return the parent POIXMLDocumentPart or null for the root element.
*/
public final POIXMLDocumentPart getParent(){
return parent;
}
@Override
public String toString(){
return packagePart == null ? "" : packagePart.toString();
}
/**
* Save the content in the underlying package part.
* Default implementation is empty meaning that the package part is left unmodified.
*
* Sub-classes should override and add logic to marshal the "model" into Ooxml4J.
*
* For example, the code saving a generic XML entry may look as follows:
*
* protected void commit() throws IOException {
* PackagePart part = getPackagePart();
* OutputStream out = part.getOutputStream();
* XmlObject bean = getXmlBean(); //the "model" which holds changes in memory
* bean.save(out, DEFAULT_XML_OPTIONS);
* out.close();
* }
*
*
* @throws IOException a subclass may throw an IOException if the changes can't be committed
*/
protected void commit() throws IOException {
}
/**
* Save changes in the underlying OOXML package.
* Recursively fires {@link #commit()} for each package part
*
* @param alreadySaved context set containing already visited nodes
*
* @throws IOException a related part may throw an IOException if the changes can't be saved
*/
protected final void onSave(Set alreadySaved) throws IOException{
// this usually clears out previous content in the part...
prepareForCommit();
commit();
alreadySaved.add(this.getPackagePart());
for(RelationPart rp : relations.values()){
POIXMLDocumentPart p = rp.getDocumentPart();
if (!alreadySaved.contains(p.getPackagePart())) {
p.onSave(alreadySaved);
}
}
}
/**
* Ensure that a memory based package part does not have lingering data from previous
* commit() calls.
*
* Note: This is overwritten for some objects, as *PictureData seem to store the actual content
* in the part directly without keeping a copy like all others therefore we need to handle them differently.
*/
protected void prepareForCommit() {
PackagePart part = this.getPackagePart();
if(part != null) {
part.clear();
}
}
/**
* Create a new child POIXMLDocumentPart
*
* @param descriptor the part descriptor
* @param factory the factory that will create an instance of the requested relation
* @return the created child POIXMLDocumentPart
* @throws PartAlreadyExistsException
* If rule M1.12 is not verified : Packages shall not contain
* equivalent part names and package implementers shall neither
* create nor recognize packages with equivalent part names.
*/
public final POIXMLDocumentPart createRelationship(POIXMLRelation descriptor, POIXMLFactory factory){
return createRelationship(descriptor, factory, -1, false).getDocumentPart();
}
/**
* Create a new child POIXMLDocumentPart
*
* @param descriptor the part descriptor
* @param factory the factory that will create an instance of the requested relation
* @param idx part number
* @return the created child POIXMLDocumentPart
* @throws PartAlreadyExistsException
* If rule M1.12 is not verified : Packages shall not contain
* equivalent part names and package implementers shall neither
* create nor recognize packages with equivalent part names.
*/
public final POIXMLDocumentPart createRelationship(POIXMLRelation descriptor, POIXMLFactory factory, int idx){
return createRelationship(descriptor, factory, idx, false).getDocumentPart();
}
/**
* Identifies the next available part number for a part of the given type,
* if possible, otherwise -1 if none are available.
* The found (valid) index can then be safely given to
* {@link #createRelationship(POIXMLRelation, POIXMLFactory, int)} or
* {@link #createRelationship(POIXMLRelation, POIXMLFactory, int, boolean)}
* without naming clashes.
* If parts with other types are already claiming a name for this relationship
* type (eg a {@link XSSFRelation#CHART} using the drawing part namespace
* normally used by {@link XSSFRelation#DRAWINGS}), those will be considered
* when finding the next spare number.
*
* @param descriptor The relationship type to find the part number for
* @param minIdx The minimum free index to assign, use -1 for any
* @return The next free part number, or -1 if none available
*/
protected final int getNextPartNumber(POIXMLRelation descriptor, int minIdx) {
OPCPackage pkg = packagePart.getPackage();
try {
String name = descriptor.getDefaultFileName();
if (name.equals(descriptor.getFileName(9999))) {
// Non-index based, check if default is free
PackagePartName ppName = PackagingURIHelper.createPartName(name);
if (pkg.containPart(ppName)) {
// Default name already taken, not index based, nothing free
return -1;
} else {
// Default name free
return 0;
}
}
// Default to searching from 1, unless they asked for 0+
int idx = (minIdx < 0) ? 1 : minIdx;
int maxIdx = minIdx + pkg.getParts().size();
while (idx <= maxIdx) {
name = descriptor.getFileName(idx);
PackagePartName ppName = PackagingURIHelper.createPartName(name);
if (!pkg.containPart(ppName)) {
return idx;
}
idx++;
}
} catch (InvalidFormatException e) {
// Give a general wrapped exception for the problem
throw new POIXMLException(e);
}
return -1;
}
/**
* Create a new child POIXMLDocumentPart
*
* @param descriptor the part descriptor
* @param factory the factory that will create an instance of the requested relation
* @param idx part number
* @param noRelation if true, then no relationship is added.
* @return the created child POIXMLDocumentPart
* @throws PartAlreadyExistsException
* If rule M1.12 is not verified : Packages shall not contain
* equivalent part names and package implementers shall neither
* create nor recognize packages with equivalent part names.
*/
protected final RelationPart createRelationship(POIXMLRelation descriptor, POIXMLFactory factory, int idx, boolean noRelation){
try {
PackagePartName ppName = PackagingURIHelper.createPartName(descriptor.getFileName(idx));
PackageRelationship rel = null;
PackagePart part = packagePart.getPackage().createPart(ppName, descriptor.getContentType());
if(!noRelation) {
/* only add to relations, if according relationship is being created. */
rel = packagePart.addRelationship(ppName, TargetMode.INTERNAL, descriptor.getRelation());
}
POIXMLDocumentPart doc = factory.newDocumentPart(descriptor);
doc.packagePart = part;
doc.parent = this;
if (!noRelation) {
/* only add to relations, if according relationship is being created. */
addRelation(rel,doc);
}
return new RelationPart(rel,doc);
} catch (PartAlreadyExistsException pae) {
// Return the specific exception so the user knows
// that the name is already taken
throw pae;
} catch (Exception e){
// Give a general wrapped exception for the problem
throw new POIXMLException(e);
}
}
/**
* Iterate through the underlying PackagePart and create child POIXMLFactory instances
* using the specified factory
*
* @param factory the factory object that creates POIXMLFactory instances
* @param context context map containing already visited noted keyed by targetURI
*
* @throws OpenXML4JException thrown when a related part can't be read
*/
protected void read(POIXMLFactory factory, Map context) throws OpenXML4JException {
PackagePart pp = getPackagePart();
// add mapping a second time, in case of initial caller hasn't done so
POIXMLDocumentPart otherChild = context.put(pp, this);
if (otherChild != null && otherChild != this) {
throw new POIXMLException("Unique PackagePart-POIXMLDocumentPart relation broken!");
}
if (!pp.hasRelationships()) return;
PackageRelationshipCollection rels = packagePart.getRelationships();
List readLater = new ArrayList();
// scan breadth-first, so parent-relations are hopefully the shallowest element
for (PackageRelationship rel : rels) {
if(rel.getTargetMode() == TargetMode.INTERNAL){
URI uri = rel.getTargetURI();
// check for internal references (e.g. '#Sheet1!A1')
PackagePartName relName;
if(uri.getRawFragment() != null) {
relName = PackagingURIHelper.createPartName(uri.getPath());
} else {
relName = PackagingURIHelper.createPartName(uri);
}
final PackagePart p = packagePart.getPackage().getPart(relName);
if (p == null) {
logger.log(POILogger.ERROR, "Skipped invalid entry " + rel.getTargetURI());
continue;
}
POIXMLDocumentPart childPart = context.get(p);
if (childPart == null) {
childPart = factory.createDocumentPart(this, p);
childPart.parent = this;
// already add child to context, so other children can reference it
context.put(p, childPart);
readLater.add(childPart);
}
addRelation(rel,childPart);
}
}
for (POIXMLDocumentPart childPart : readLater) {
childPart.read(factory, context);
}
}
/**
* Get the PackagePart that is the target of a relationship from this Part.
*
* @param rel The relationship
* @return The target part
* @throws InvalidFormatException thrown if the related part has is erroneous
*/
protected PackagePart getTargetPart(PackageRelationship rel) throws InvalidFormatException {
return getPackagePart().getRelatedPart(rel);
}
/**
* Fired when a new package part is created
*
* @throws IOException a subclass may throw an IOException on document creation
*/
protected void onDocumentCreate() throws IOException {
}
/**
* Fired when a package part is read
*
* @throws IOException a subclass may throw an IOException when a document is read
*/
protected void onDocumentRead() throws IOException {
}
/**
* Fired when a package part is about to be removed from the package
*
* @throws IOException a subclass may throw an IOException when a document is removed
*/
protected void onDocumentRemove() throws IOException {
}
/**
* Internal method, do not use!
*
* This method only exists to allow access to protected {@link POIXMLDocumentPart#onDocumentRead()}
* from {@link org.apache.poi.xwpf.usermodel.XWPFDocument} without reflection. It should be removed.
*
* @param part the part which is to be read
*
* @throws IOException if the part can't be read
*/
@Internal @Deprecated
public static void _invokeOnDocumentRead(POIXMLDocumentPart part) throws IOException {
part.onDocumentRead();
}
/**
* Retrieves the core document part
*
* @since POI 3.14-Beta1
*/
private static PackagePart getPartFromOPCPackage(OPCPackage pkg, String coreDocumentRel) {
PackageRelationship coreRel = pkg.getRelationshipsByType(coreDocumentRel).getRelationship(0);
if (coreRel != null) {
PackagePart pp = pkg.getPart(coreRel);
if (pp == null) {
throw new POIXMLException("OOXML file structure broken/invalid - core document '"+coreRel.getTargetURI()+"' not found.");
}
return pp;
}
coreRel = pkg.getRelationshipsByType(PackageRelationshipTypes.STRICT_CORE_DOCUMENT).getRelationship(0);
if (coreRel != null) {
throw new POIXMLException("Strict OOXML isn't currently supported, please see bug #57699");
}
throw new POIXMLException("OOXML file structure broken/invalid - no core document found!");
}
}