/*
* 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.
*/
package org.apache.sling.installer.provider.jcr.impl;
import java.io.ByteArrayOutputStream;
import java.io.ObjectOutputStream;
import java.lang.reflect.Array;
import java.math.BigInteger;
import java.security.MessageDigest;
import java.util.Dictionary;
import java.util.Enumeration;
import java.util.Hashtable;
import java.util.SortedSet;
import java.util.TreeSet;
import javax.jcr.Node;
import javax.jcr.Property;
import javax.jcr.PropertyIterator;
import javax.jcr.PropertyType;
import javax.jcr.RepositoryException;
import javax.jcr.Value;
import org.apache.sling.installer.api.InstallableResource;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/** Converts configuration nodes to InstallableData */
class ConfigNodeConverter implements JcrInstaller.NodeConverter {
public static final String CONFIG_NODE_TYPE = "sling:OsgiConfig";
private final Logger log = LoggerFactory.getLogger(getClass());
/** Convert n to an InstallableData, or return null
* if we don't know how to convert it.
*/
public InstallableResource convertNode(final Node n,
final int priority)
throws RepositoryException {
InstallableResource result = null;
// We only consider CONFIG_NODE_TYPE nodes
if(n.isNodeType(CONFIG_NODE_TYPE)) {
final Dictionary<String, Object> dict = load(n);
result = new InstallableResource(n.getPath(), null, dict, computeDigest(dict), null, priority);
log.debug("Converted node {} to {}", n.getPath(), result);
} else {
log.debug("Node is not a {} node, ignored:{}", CONFIG_NODE_TYPE, n.getPath());
}
return result;
}
/** Load config from node n */
protected Dictionary<String, Object> load(Node n) throws RepositoryException {
Dictionary<String, Object> result = new Hashtable<String, Object>();
log.debug("Loading config from Node {}", n.getPath());
// load default values from node itself
log.debug("Loading {} properties", n.getPath());
loadProperties(result, n);
return result;
}
/** Load properties of n into d */
protected void loadProperties(Dictionary<String, Object> d, Node n) throws RepositoryException {
final PropertyIterator pi = n.getProperties();
while(pi.hasNext()) {
final Property p = pi.nextProperty();
final String name = p.getName();
// ignore jcr: and similar properties
if(name.contains(":")) {
continue;
}
if (p.getDefinition().isMultiple()) {
Object [] data = null;
final Value [] values = p.getValues();
int i = 0;
for (Value v : values) {
Object o = convertValue(v);
if (i == 0) {
data = (Object[])Array.newInstance(o.getClass(), values.length);
}
data[i++] = o;
}
// create empty array in case no value is specified
if ( data == null ) {
data = new String[0];
}
d.put(name, data);
} else {
final Object o = convertValue(p.getValue());
if (o != null) {
d.put(name, o);
}
}
}
}
/**
* Convert v according to its type.
*/
protected Object convertValue(Value v) throws RepositoryException {
switch(v.getType()) {
case PropertyType.STRING:
return v.getString();
case PropertyType.DATE:
return v.getDate();
case PropertyType.DOUBLE:
return v.getDouble();
case PropertyType.LONG:
return v.getLong();
case PropertyType.BOOLEAN:
return v.getBoolean();
}
log.debug("Value of type {} ignored", v.getType());
return null;
}
/** convert digest to readable string (http://www.javalobby.org/java/forums/t84420.html) */
private static String digestToString(MessageDigest d) {
final BigInteger bigInt = new BigInteger(1, d.digest());
return new String(bigInt.toString(16));
}
/** Digest is needed to detect changes in data, and must not depend on dictionary ordering */
private static String computeDigest(Dictionary<String, Object> data) {
try {
final MessageDigest d = MessageDigest.getInstance("MD5");
final ByteArrayOutputStream bos = new ByteArrayOutputStream();
final ObjectOutputStream oos = new ObjectOutputStream(bos);
final SortedSet<String> sortedKeys = new TreeSet<String>();
if(data != null) {
for(Enumeration<String> e = data.keys(); e.hasMoreElements(); ) {
final String key = e.nextElement();
sortedKeys.add(key);
}
}
for(String key : sortedKeys) {
oos.writeObject(key);
oos.writeObject(data.get(key));
}
bos.flush();
d.update(bos.toByteArray());
return digestToString(d);
} catch (Exception ignore) {
return data.toString();
}
}
}