/*
* 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: Metadata.java 888794 2009-12-09 13:21:04Z jeremias $ */
package org.apache.xmlgraphics.xmp;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
import org.xml.sax.ContentHandler;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.AttributesImpl;
import org.apache.xmlgraphics.util.QName;
import org.apache.xmlgraphics.util.XMLizable;
import org.apache.xmlgraphics.xmp.merge.MergeRuleSet;
import org.apache.xmlgraphics.xmp.merge.PropertyMerger;
/**
* This class represents the root of an XMP metadata tree. It's more or less equivalent to the
* x:xmpmeta element together with its nested rdf:RDF element.
*/
public class Metadata implements XMLizable, PropertyAccess {
private Map properties = new java.util.HashMap();
/** {@inheritDoc} */
public void setProperty(XMPProperty prop) {
properties.put(prop.getName(), prop);
}
/** {@inheritDoc} */
public XMPProperty getProperty(String uri, String localName) {
return getProperty(new QName(uri, localName));
}
/** {@inheritDoc} */
public XMPProperty getProperty(QName name) {
XMPProperty prop = (XMPProperty)properties.get(name);
return prop;
}
/** {@inheritDoc} */
public XMPProperty removeProperty(QName name) {
return (XMPProperty)properties.remove(name);
}
/** {@inheritDoc} */
public XMPProperty getValueProperty() {
return getProperty(XMPConstants.RDF_VALUE);
}
/** {@inheritDoc} */
public int getPropertyCount() {
return this.properties.size();
}
/** {@inheritDoc} */
public Iterator iterator() {
return this.properties.keySet().iterator();
}
/**
* Merges this metadata object into a given target metadata object. The merge rule set provided
* by each schema is used for the merge.
* @param target the target metadata to merge the local metadata into
*/
public void mergeInto(Metadata target) {
XMPSchemaRegistry registry = XMPSchemaRegistry.getInstance();
Iterator iter = properties.values().iterator();
while (iter.hasNext()) {
XMPProperty prop = (XMPProperty)iter.next();
XMPSchema schema = registry.getSchema(prop.getNamespace());
MergeRuleSet rules = schema.getDefaultMergeRuleSet();
PropertyMerger merger = rules.getPropertyMergerFor(prop);
merger.merge(prop, target);
}
}
/** {@inheritDoc} */
public void toSAX(ContentHandler handler) throws SAXException {
AttributesImpl atts = new AttributesImpl();
handler.startPrefixMapping("x", XMPConstants.XMP_NAMESPACE);
handler.startElement(XMPConstants.XMP_NAMESPACE, "xmpmeta", "x:xmpmeta", atts);
handler.startPrefixMapping("rdf", XMPConstants.RDF_NAMESPACE);
handler.startElement(XMPConstants.RDF_NAMESPACE, "RDF", "rdf:RDF", atts);
//Get all property namespaces
Set namespaces = new java.util.HashSet();
Iterator iter = properties.keySet().iterator();
while (iter.hasNext()) {
QName n = ((QName)iter.next());
namespaces.add(n.getNamespaceURI());
}
//One Description element per namespace
iter = namespaces.iterator();
while (iter.hasNext()) {
String ns = (String)iter.next();
XMPSchema schema = XMPSchemaRegistry.getInstance().getSchema(ns);
String prefix = (schema != null ? schema.getPreferredPrefix() : null);
boolean first = true;
boolean empty = true;
Iterator props = properties.values().iterator();
while (props.hasNext()) {
XMPProperty prop = (XMPProperty)props.next();
if (prop.getName().getNamespaceURI().equals(ns)) {
if (first) {
if (prefix == null) {
prefix = prop.getName().getPrefix();
}
atts.clear();
atts.addAttribute(XMPConstants.RDF_NAMESPACE,
"about", "rdf:about", "CDATA", "");
if (prefix != null) {
handler.startPrefixMapping(prefix, ns);
}
handler.startElement(XMPConstants.RDF_NAMESPACE,
"RDF", "rdf:Description", atts);
empty = false;
first = false;
}
prop.toSAX(handler);
}
}
if (!empty) {
handler.endElement(XMPConstants.RDF_NAMESPACE, "RDF", "rdf:Description");
if (prefix != null) {
handler.endPrefixMapping(prefix);
}
}
}
handler.endElement(XMPConstants.RDF_NAMESPACE, "RDF", "rdf:RDF");
handler.endPrefixMapping("rdf");
handler.endElement(XMPConstants.XMP_NAMESPACE, "xmpmeta", "x:xmpmeta");
handler.endPrefixMapping("x");
}
}