/*
* Copyright 2004-2005 The Apache Software Foundation or its licensors,
* as applicable.
*
* Licensed 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.jackrabbit.core.xml;
import org.apache.jackrabbit.name.IllegalNameException;
import org.apache.jackrabbit.name.NamespaceResolver;
import org.apache.jackrabbit.name.QName;
import org.apache.jackrabbit.name.UnknownPrefixException;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import javax.jcr.InvalidSerializedDataException;
import javax.jcr.PropertyType;
import javax.jcr.RepositoryException;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.Stack;
/**
* <code>SysViewImportHandler</code> ...
*/
class SysViewImportHandler extends TargetImportHandler {
/**
* stack of ImportState instances; an instance is pushed onto the stack
* in the startElement method every time a sv:node element is encountered;
* the same instance is popped from the stack in the endElement method
* when the corresponding sv:node element is encountered.
*/
private final Stack stack = new Stack();
/**
* fields used temporarily while processing sv:property and sv:value elements
*/
private QName currentPropName;
private int currentPropType = PropertyType.UNDEFINED;
// list of AppendableValue objects
private ArrayList currentPropValues = new ArrayList();
private AppendableValue currentPropValue;
/**
* Constructs a new <code>SysViewImportHandler</code>.
*
* @param importer
* @param nsContext
*/
SysViewImportHandler(Importer importer, NamespaceResolver nsContext) {
super(importer, nsContext);
}
private void processNode(ImportState state, boolean start, boolean end)
throws SAXException {
if (!start && !end) {
return;
}
Importer.NodeInfo node = new Importer.NodeInfo();
node.setName(state.nodeName);
node.setNodeTypeName(state.nodeTypeName);
if (state.mixinNames != null) {
QName[] mixins = (QName[]) state.mixinNames.toArray(new QName[state.mixinNames.size()]);
node.setMixinNames(mixins);
}
node.setUUID(state.uuid);
// call Importer
try {
if (start) {
importer.startNode(node, state.props, nsContext);
// dispose temporary property values
for (Iterator iter = state.props.iterator(); iter.hasNext();) {
Importer.PropInfo pi = (Importer.PropInfo) iter.next();
disposePropertyValues(pi);
}
}
if (end) {
importer.endNode(node);
}
} catch (RepositoryException re) {
throw new SAXException(re);
}
}
//-------------------------------------------------------< ContentHandler >
/**
* {@inheritDoc}
*/
public void startDocument() throws SAXException {
try {
importer.start();
} catch (RepositoryException re) {
throw new SAXException(re);
}
}
/**
* {@inheritDoc}
*/
public void startElement(String namespaceURI, String localName,
String qName, Attributes atts)
throws SAXException {
// check namespace
if (!QName.NS_SV_URI.equals(namespaceURI)) {
throw new SAXException(new InvalidSerializedDataException("invalid namespace for element in system view xml document: "
+ namespaceURI));
}
// check element name
if (SysViewSAXEventGenerator.NODE_ELEMENT.equals(localName)) {
// sv:node element
// node name (value of sv:name attribute)
String name = atts.getValue(SysViewSAXEventGenerator.PREFIXED_NAME_ATTRIBUTE);
if (name == null) {
throw new SAXException(new InvalidSerializedDataException(
"missing mandatory sv:name attribute of element sv:node"));
}
if (!stack.isEmpty()) {
// process current node first
ImportState current = (ImportState) stack.peek();
// need to start current node
if (!current.started) {
processNode(current, true, false);
current.started = true;
}
}
// push new ImportState instance onto the stack
ImportState state = new ImportState();
try {
state.nodeName = QName.fromJCRName(name, nsContext);
} catch (IllegalNameException ine) {
throw new SAXException(new InvalidSerializedDataException("illegal node name: " + name, ine));
} catch (UnknownPrefixException upe) {
throw new SAXException(new InvalidSerializedDataException("illegal node name: " + name, upe));
}
stack.push(state);
} else if (SysViewSAXEventGenerator.PROPERTY_ELEMENT.equals(localName)) {
// sv:property element
// reset temp fields
currentPropValues.clear();
// property name (value of sv:name attribute)
String name = atts.getValue(SysViewSAXEventGenerator.PREFIXED_NAME_ATTRIBUTE);
if (name == null) {
throw new SAXException(new InvalidSerializedDataException(
"missing mandatory sv:name attribute of element sv:property"));
}
try {
currentPropName = QName.fromJCRName(name, nsContext);
} catch (IllegalNameException ine) {
throw new SAXException(new InvalidSerializedDataException("illegal property name: " + name, ine));
} catch (UnknownPrefixException upe) {
throw new SAXException(new InvalidSerializedDataException("illegal property name: " + name, upe));
}
// property type (sv:type attribute)
String type = atts.getValue(SysViewSAXEventGenerator.PREFIXED_TYPE_ATTRIBUTE);
if (type == null) {
throw new SAXException(new InvalidSerializedDataException(
"missing mandatory sv:type attribute of element sv:property"));
}
currentPropType = PropertyType.valueFromName(type);
} else if (SysViewSAXEventGenerator.VALUE_ELEMENT.equals(localName)) {
// sv:value element
// reset temp fields
currentPropValue = new BufferedStringValue();
} else {
throw new SAXException(new InvalidSerializedDataException("unexpected element found in system view xml document: "
+ localName));
}
}
/**
* {@inheritDoc}
*/
public void characters(char[] ch, int start, int length)
throws SAXException {
if (currentPropValue != null) {
// property value (character data of sv:value element)
try {
currentPropValue.append(ch, start, length);
} catch (IOException ioe) {
throw new SAXException("error while processing property value",
ioe);
}
}
}
/**
* {@inheritDoc}
*/
public void ignorableWhitespace(char[] ch, int start, int length)
throws SAXException {
if (currentPropValue != null) {
// property value
// data reported by the ignorableWhitespace event within
// sv:value tags is considered part of the value
try {
currentPropValue.append(ch, start, length);
} catch (IOException ioe) {
throw new SAXException("error while processing property value",
ioe);
}
}
}
/**
* {@inheritDoc}
*/
public void endElement(String namespaceURI, String localName, String qName)
throws SAXException {
// check element name
ImportState state = (ImportState) stack.peek();
if (SysViewSAXEventGenerator.NODE_ELEMENT.equals(localName)) {
// sv:node element
if (!state.started) {
// need to start & end current node
processNode(state, true, true);
state.started = true;
} else {
// need to end current node
processNode(state, false, true);
}
// pop current state from stack
stack.pop();
} else if (SysViewSAXEventGenerator.PROPERTY_ELEMENT.equals(localName)) {
// sv:property element
// check if all system properties (jcr:primaryType, jcr:uuid etc.)
// have been collected and create node as necessary
if (currentPropName.equals(QName.JCR_PRIMARYTYPE)) {
AppendableValue val = (AppendableValue) currentPropValues.get(0);
String s = null;
try {
s = val.retrieve();
state.nodeTypeName = QName.fromJCRName(s, nsContext);
} catch (IOException ioe) {
throw new SAXException("error while retrieving value", ioe);
} catch (IllegalNameException ine) {
throw new SAXException(new InvalidSerializedDataException("illegal node type name: " + s, ine));
} catch (UnknownPrefixException upe) {
throw new SAXException(new InvalidSerializedDataException("illegal node type name: " + s, upe));
}
} else if (currentPropName.equals(QName.JCR_MIXINTYPES)) {
if (state.mixinNames == null) {
state.mixinNames = new ArrayList(currentPropValues.size());
}
for (int i = 0; i < currentPropValues.size(); i++) {
AppendableValue val =
(AppendableValue) currentPropValues.get(i);
String s = null;
try {
s = val.retrieve();
QName mixin = QName.fromJCRName(s, nsContext);
state.mixinNames.add(mixin);
} catch (IOException ioe) {
throw new SAXException("error while retrieving value", ioe);
} catch (IllegalNameException ine) {
throw new SAXException(new InvalidSerializedDataException("illegal mixin type name: " + s, ine));
} catch (UnknownPrefixException upe) {
throw new SAXException(new InvalidSerializedDataException("illegal mixin type name: " + s, upe));
}
}
} else if (currentPropName.equals(QName.JCR_UUID)) {
AppendableValue val = (AppendableValue) currentPropValues.get(0);
try {
state.uuid = val.retrieve();
} catch (IOException ioe) {
throw new SAXException("error while retrieving value", ioe);
}
} else {
Importer.PropInfo prop = new Importer.PropInfo();
prop.setName(currentPropName);
prop.setType(currentPropType);
prop.setValues((Importer.TextValue[])
currentPropValues.toArray(new Importer.TextValue[currentPropValues.size()]));
state.props.add(prop);
}
// reset temp fields
currentPropValues.clear();
} else if (SysViewSAXEventGenerator.VALUE_ELEMENT.equals(localName)) {
// sv:value element
currentPropValues.add(currentPropValue);
// reset temp fields
currentPropValue = null;
} else {
throw new SAXException(new InvalidSerializedDataException("invalid element in system view xml document: " + localName));
}
}
/**
* {@inheritDoc}
*/
public void endDocument() throws SAXException {
try {
importer.end();
} catch (RepositoryException re) {
throw new SAXException(re);
}
}
//--------------------------------------------------------< inner classes >
class ImportState {
/**
* name of current node
*/
QName nodeName;
/**
* primary type of current node
*/
QName nodeTypeName;
/**
* list of mixin types of current node
*/
ArrayList mixinNames;
/**
* uuid of current node
*/
String uuid;
/**
* list of PropInfo instances representing properties of current node
*/
ArrayList props = new ArrayList();
/**
* flag indicating whether startNode() has been called for current node
*/
boolean started = false;
}
}