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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.pdf;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Date;
import javax.xml.transform.TransformerConfigurationException;
import org.apache.xmlgraphics.xmp.Metadata;
import org.apache.xmlgraphics.xmp.XMPSerializer;
import org.apache.xmlgraphics.xmp.schemas.DublinCoreAdapter;
import org.apache.xmlgraphics.xmp.schemas.DublinCoreSchema;
import org.apache.xmlgraphics.xmp.schemas.XMPBasicAdapter;
import org.apache.xmlgraphics.xmp.schemas.XMPBasicSchema;
import org.apache.xmlgraphics.xmp.schemas.pdf.AdobePDFAdapter;
import org.apache.xmlgraphics.xmp.schemas.pdf.AdobePDFSchema;
import org.apache.xmlgraphics.xmp.schemas.pdf.PDFAAdapter;
import org.apache.xmlgraphics.xmp.schemas.pdf.PDFAXMPSchema;
import org.xml.sax.SAXException;
/**
* Special PDFStream for Metadata.
* @since PDF 1.4
*/
public class PDFMetadata extends PDFStream {
private Metadata xmpMetadata;
private boolean readOnly = true;
/** @see org.apache.fop.pdf.PDFObject#PDFObject() */
public PDFMetadata(Metadata xmp, boolean readOnly) {
super();
if (xmp == null) {
throw new NullPointerException(
"The parameter for the XMP Document must not be null");
}
this.xmpMetadata = xmp;
this.readOnly = readOnly;
}
/** @see org.apache.fop.pdf.AbstractPDFStream#setupFilterList() */
protected void setupFilterList() {
if (!getFilterList().isInitialized()) {
getFilterList().addDefaultFilters(
getDocumentSafely().getFilterMap(),
PDFFilterList.METADATA_FILTER);
}
super.setupFilterList();
}
/**
* @return the XMP metadata
*/
public Metadata getMetadata() {
return this.xmpMetadata;
}
/**
* overload the base object method so we don't have to copy
* byte arrays around so much
* @see org.apache.fop.pdf.PDFObject#output(OutputStream)
*/
protected int output(java.io.OutputStream stream)
throws java.io.IOException {
int length = super.output(stream);
this.xmpMetadata = null; //Release DOM when it's not used anymore
return length;
}
/** @see org.apache.fop.pdf.AbstractPDFStream#outputRawStreamData(java.io.OutputStream) */
protected void outputRawStreamData(OutputStream out) throws IOException {
try {
XMPSerializer.writeXMPPacket(xmpMetadata, out, this.readOnly);
} catch (TransformerConfigurationException tce) {
throw new IOException("Error setting up Transformer for XMP stream serialization: "
+ tce.getMessage());
} catch (SAXException saxe) {
throw new IOException("Error while serializing XMP stream: "
+ saxe.getMessage());
}
}
/** @see org.apache.fop.pdf.AbstractPDFStream#buildStreamDict(String) */
protected String buildStreamDict(String lengthEntry) {
final String filterEntry = getFilterList().buildFilterDictEntries();
if (getDocumentSafely().getProfile().getPDFAMode().isPDFA1LevelB()
&& filterEntry != null && filterEntry.length() > 0) {
throw new PDFConformanceException(
"The Filter key is prohibited when PDF/A-1 is active");
}
final StringBuffer sb = new StringBuffer(128);
sb.append(getObjectID());
sb.append("<< ");
sb.append("/Type /Metadata");
sb.append("\n/Subtype /XML");
sb.append("\n/Length " + lengthEntry);
sb.append("\n" + filterEntry);
sb.append("\n>>\n");
return sb.toString();
}
/**
* Creates an XMP document based on the settings on the PDF Document.
* @param pdfDoc the PDF Document
* @return the requested XMP metadata
*/
public static Metadata createXMPFromUserAgent(PDFDocument pdfDoc) {
Metadata meta = new Metadata();
PDFInfo info = pdfDoc.getInfo();
//Set creation date if not available, yet
if (info.getCreationDate() == null) {
Date d = new Date();
info.setCreationDate(d);
}
//Important: Acrobat 7's preflight check for PDF/A-1b wants the creation date in the Info
//object and in the XMP metadata to have the same timezone or else it shows a validation
//error even if the times are essentially equal.
//Dublin Core
DublinCoreAdapter dc = DublinCoreSchema.getAdapter(meta);
if (info.getAuthor() != null) {
dc.addCreator(info.getAuthor());
}
if (info.getTitle() != null) {
dc.setTitle(info.getTitle());
}
if (info.getSubject() != null) {
//Subject maps to dc:description["x-default"] as per ISO-19005-1:2005/Cor.1:2007
dc.setDescription(null, info.getSubject());
}
dc.addDate(info.getCreationDate());
//PDF/A identification
PDFAMode pdfaMode = pdfDoc.getProfile().getPDFAMode();
if (pdfaMode.isPDFA1LevelB()) {
PDFAAdapter pdfa = PDFAXMPSchema.getAdapter(meta);
pdfa.setPart(1);
if (pdfaMode == PDFAMode.PDFA_1A) {
pdfa.setConformance("A"); //PDF/A-1a
} else {
pdfa.setConformance("B"); //PDF/A-1b
}
}
//XMP Basic Schema
XMPBasicAdapter xmpBasic = XMPBasicSchema.getAdapter(meta);
xmpBasic.setCreateDate(info.getCreationDate());
PDFProfile profile = pdfDoc.getProfile();
if (info.getModDate() != null) {
xmpBasic.setModifyDate(info.getModDate());
} else if (profile.isModDateRequired()) {
//if modify date is needed but none is in the Info object, use creation date
xmpBasic.setModifyDate(info.getCreationDate());
}
if (info.getCreator() != null) {
xmpBasic.setCreatorTool(info.getCreator());
}
AdobePDFAdapter adobePDF = AdobePDFSchema.getAdapter(meta);
if (info.getKeywords() != null) {
adobePDF.setKeywords(info.getKeywords());
}
if (info.getProducer() != null) {
adobePDF.setProducer(info.getProducer());
}
adobePDF.setPDFVersion(pdfDoc.getPDFVersionString());
return meta;
}
/**
* Updates the values in the Info object from the XMP metadata according to the rules defined
* in PDF/A-1 (ISO 19005-1:2005)
* @param meta the metadata
* @param info the Info object
*/
public static void updateInfoFromMetadata(Metadata meta, PDFInfo info) {
DublinCoreAdapter dc = DublinCoreSchema.getAdapter(meta);
info.setTitle(dc.getTitle());
String[] creators = dc.getCreators();
if (creators != null && creators.length > 0) {
info.setAuthor(creators[0]);
} else {
info.setAuthor(null);
}
//dc:description["x-default"] maps to Subject as per ISO-19005-1:2005/Cor.1:2007
info.setSubject(dc.getDescription());
AdobePDFAdapter pdf = AdobePDFSchema.getAdapter(meta);
info.setKeywords(pdf.getKeywords());
info.setProducer(pdf.getProducer());
XMPBasicAdapter xmpBasic = XMPBasicSchema.getAdapter(meta);
info.setCreator(xmpBasic.getCreatorTool());
Date d;
d = xmpBasic.getCreateDate();
xmpBasic.setCreateDate(d); //To make Adobe Acrobat happy (bug filed with Adobe)
//Adobe Acrobat doesn't like it when the xmp:CreateDate has a different timezone
//than Info/CreationDate
info.setCreationDate(d);
d = xmpBasic.getModifyDate();
if (d != null) { //ModifyDate is only required for PDF/X
xmpBasic.setModifyDate(d);
info.setModDate(d);
}
}
}
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