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eXist-db NoSQL Database Core
/*
* eXist-db Open Source Native XML Database
* Copyright (C) 2001 The eXist-db Authors
*
* [email protected]
* http://www.exist-db.org
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
package org.exist.xquery;
import java.net.URISyntaxException;
import java.util.List;
import org.exist.dom.persistent.AVLTreeNodeSet;
import org.exist.dom.persistent.DocumentImpl;
import org.exist.dom.persistent.NodeProxy;
import org.exist.dom.memtree.DocumentBuilderReceiver;
import org.exist.dom.memtree.MemTreeBuilder;
import org.exist.dom.memtree.NodeImpl;
import org.exist.numbering.NodeId;
import org.exist.security.PermissionDeniedException;
import org.exist.storage.DBBroker;
import org.apache.commons.io.input.UnsynchronizedByteArrayInputStream;
import org.exist.util.serializer.DOMStreamer;
import org.exist.util.serializer.SerializerPool;
import org.exist.xmldb.LocalXMLResource;
import org.exist.xmldb.RemoteXMLResource;
import org.exist.xmldb.XmldbURI;
import org.exist.xquery.value.*;
import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;
import org.xmldb.api.base.ResourceIterator;
import org.xmldb.api.base.ResourceSet;
import org.xmldb.api.base.XMLDBException;
import org.xmldb.api.modules.XMLResource;
public class XPathUtil {
/**
* Convert Java object to an XQuery sequence. Objects of type Sequence are
* directly returned, other objects are converted into the corresponding
* internal types.
*
* @param obj The java object
* @param context XQuery context
* @return XQuery sequence
* @throws XPathException in case of an error
*/
public final static Sequence javaObjectToXPath(Object obj, XQueryContext context)
throws XPathException {
return javaObjectToXPath(obj, context, true);
}
public final static Sequence javaObjectToXPath(Object obj, XQueryContext context,
boolean expandChars) throws XPathException {
if (obj == null) {
//return Sequence.EMPTY_SEQUENCE;
return null;
} else if (obj instanceof Sequence) {
return (Sequence) obj;
} else if (obj instanceof String) {
final StringValue v = new StringValue((String) obj);
return (expandChars ? v.expand() : v);
} else if (obj instanceof Boolean) {
return BooleanValue.valueOf(((Boolean) obj));
} else if (obj instanceof Float) {
return new FloatValue(((Float) obj));
} else if (obj instanceof Double) {
return new DoubleValue(((Double) obj));
} else if (obj instanceof Short) {
return new IntegerValue(((Short) obj), Type.SHORT);
} else if (obj instanceof Integer) {
return new IntegerValue(((Integer) obj), Type.INT);
} else if (obj instanceof Long) {
return new IntegerValue(((Long) obj), Type.LONG);
} else if (obj instanceof byte[]) {
return BinaryValueFromInputStream.getInstance(context, new Base64BinaryValueType(), new UnsynchronizedByteArrayInputStream((byte[]) obj));
} else if (obj instanceof ResourceSet) {
final Sequence seq = new AVLTreeNodeSet();
try {
final DBBroker broker = context.getBroker();
for (final ResourceIterator it = ((ResourceSet) obj).getIterator(); it.hasMoreResources();) {
seq.add(getNode(broker, (XMLResource) it.nextResource()));
}
} catch (final XMLDBException xe) {
throw new XPathException("Failed to convert ResourceSet to node: " + xe.getMessage());
}
return seq;
} else if (obj instanceof XMLResource) {
return getNode(context.getBroker(), (XMLResource) obj);
} else if (obj instanceof Node) {
context.pushDocumentContext();
final DOMStreamer streamer = (DOMStreamer) SerializerPool.getInstance().borrowObject(DOMStreamer.class);
try {
final MemTreeBuilder builder = context.getDocumentBuilder();
builder.startDocument();
final DocumentBuilderReceiver receiver = new DocumentBuilderReceiver(builder);
streamer.setContentHandler(receiver);
streamer.serialize((Node) obj, false);
if(obj instanceof Document) {
return builder.getDocument();
} else {
return builder.getDocument().getNode(1);
}
} catch (final SAXException e) {
throw new XPathException(
"Failed to transform node into internal model: "
+ e.getMessage());
} finally {
context.popDocumentContext();
SerializerPool.getInstance().returnObject(streamer);
}
} else if (obj instanceof List) {
boolean createNodeSequence = true;
for (Object next : ((List) obj)) {
if (!(next instanceof NodeProxy)) {
createNodeSequence = false;
break;
}
}
Sequence seq = createNodeSequence ? new AVLTreeNodeSet() : new ValueSequence();
for (Object o : ((List) obj)) {
seq.add((Item) javaObjectToXPath(o, context, expandChars));
}
return seq;
} else if (obj instanceof NodeList) {
context.pushDocumentContext();
final DOMStreamer streamer = (DOMStreamer) SerializerPool.getInstance().borrowObject(DOMStreamer.class);
try {
final MemTreeBuilder builder = context.getDocumentBuilder();
builder.startDocument();
final DocumentBuilderReceiver receiver = new DocumentBuilderReceiver(builder);
streamer.setContentHandler(receiver);
final ValueSequence seq = new ValueSequence();
final NodeList nl = (NodeList) obj;
int last = builder.getDocument().getLastNode();
for (int i = 0; i < nl.getLength(); i++) {
final Node n = nl.item(i);
streamer.serialize(n, false);
final NodeImpl created = builder.getDocument().getNode(last + 1);
seq.add(created);
last = builder.getDocument().getLastNode();
}
return seq;
} catch (final SAXException e) {
throw new XPathException(
"Failed to transform node into internal model: "
+ e.getMessage());
} finally {
context.popDocumentContext();
SerializerPool.getInstance().returnObject(streamer);
}
} else if (obj instanceof Object[]) {
boolean createNodeSequence = true;
final Object[] array = (Object[]) obj;
for (Object arrayItem : array) {
if (!(arrayItem instanceof NodeProxy)) {
createNodeSequence = false;
break;
}
}
Sequence seq = createNodeSequence ? new AVLTreeNodeSet() : new ValueSequence();
for (Object arrayItem : array) {
seq.add((Item) javaObjectToXPath(arrayItem, context, expandChars));
}
return seq;
} else {
return new JavaObjectValue(obj);
}
}
public final static int javaClassToXPath(Class clazz) {
if (clazz == String.class) {
return Type.STRING;
} else if (clazz == Boolean.class || clazz == boolean.class) {
return Type.BOOLEAN;
} else if (clazz == Integer.class || clazz == int.class
|| clazz == Long.class || clazz == long.class
|| clazz == Short.class || clazz == short.class
|| clazz == Byte.class || clazz == byte.class) {
return Type.INTEGER;
} else if (clazz == Double.class || clazz == double.class) {
return Type.DOUBLE;
} else if (clazz == Float.class || clazz == float.class) {
return Type.FLOAT;
} else if (clazz.isAssignableFrom(Node.class)) {
return Type.NODE;
} else {
return Type.JAVA_OBJECT;
}
}
/**
* Converts an XMLResource into a NodeProxy.
*
* @param broker The DBBroker to use to access the database
* @param xres The XMLResource to convert
* @return A NodeProxy for accessing the content represented by xres
* @throws XPathException if an XMLDBException is encountered
*/
public static final NodeProxy getNode(DBBroker broker, XMLResource xres) throws XPathException {
if (xres instanceof LocalXMLResource) {
final LocalXMLResource lres = (LocalXMLResource) xres;
try {
return lres.getNode();
} catch (final XMLDBException xe) {
throw new XPathException("Failed to convert LocalXMLResource to node: " + xe.getMessage());
}
}
DocumentImpl document;
try {
document = broker.getCollection(XmldbURI.xmldbUriFor(xres.getParentCollection().getName())).getDocument(broker, XmldbURI.xmldbUriFor(xres.getDocumentId()));
} catch (final URISyntaxException xe) {
throw new XPathException(xe);
} catch (final XMLDBException xe) {
throw new XPathException("Failed to get document for RemoteXMLResource: " + xe.getMessage());
} catch (final PermissionDeniedException pde) {
throw new XPathException("Failed to get document: " + pde.getMessage());
}
final NodeId nodeId = broker.getBrokerPool().getNodeFactory().createFromString(((RemoteXMLResource) xres).getNodeId());
return new NodeProxy(document, nodeId);
}
}
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