/*
* 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.jackrabbit.mongomk.impl.builder;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import org.apache.jackrabbit.mongomk.api.model.Node;
import org.apache.jackrabbit.mongomk.impl.json.JsonUtil;
import org.apache.jackrabbit.mongomk.impl.model.NodeImpl;
import org.apache.jackrabbit.oak.commons.PathUtils;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
/**
* A builder to create {@link Node}s from <a hred="http://en.wikipedia.org/wiki/JavaScript_Object_Notation">JSON</a>
* strings.
*
* @author <a href="mailto:pmarx@adobe.com>Philipp Marx</a>
*/
public class NodeBuilder {
/**
* Creates {@link Node} from the given {@code json} and an empty path as root path.
*
* @param json The {@code json}.
* @return The {@code Node}.
* @throws Exception If an error occurred while creating.
* @see #build(String, String)
*/
public static Node build(String json) throws Exception {
return build(json, "");
}
/**
* Creates {@link Node} from the given {@code json} and an empty path as root path.
*
* @param json The {@code json}.
* @param path The root path of the nodes.
* @return The {@code Node}.
* @throws Exception If an error occurred while creating.
* @see #build(String, String)
*/
public static Node build(String json, String path) throws Exception {
NodeBuilder nodeBuilder = new NodeBuilder();
return nodeBuilder.doBuild(json, path);
}
private NodeBuilder() {
// only private construction
}
private Node doBuild(String json, String path) throws Exception {
try {
JSONObject jsonObject = new JSONObject(json);
JSONArray names = jsonObject.names();
if (names.length() != 1) {
throw new IllegalArgumentException("JSON must contain exactly 1 root node");
}
String name = names.getString(0);
JSONObject value = jsonObject.getJSONObject(name);
return parseNode(PathUtils.concat(path, name), value);
} catch (JSONException e) {
throw new Exception(e);
}
}
private Node parseNode(String path, JSONObject jsonObject) throws Exception {
String realPath = path;
String revisionId = null;
int index = path.lastIndexOf('#');
if (index != -1) {
realPath = path.substring(0, index);
revisionId = path.substring(index + 1);
}
NodeImpl node = new NodeImpl(realPath);
node.setRevisionId(revisionId);
Map<String, Object> properties = null;
for (@SuppressWarnings("rawtypes")
Iterator iterator = jsonObject.keys(); iterator.hasNext();) {
String key = (String) iterator.next();
Object value = jsonObject.get(key);
if (value instanceof JSONObject) {
String childPath = PathUtils.concat(realPath, key);
Node childNode = parseNode(childPath, (JSONObject) value);
node.addChild(childNode);
} else {
if (properties == null) {
properties = new HashMap<String, Object>();
}
Object converted = JsonUtil.convertJsonValue(value.toString());
properties.put(key, converted);
}
}
node.setProperties(properties);
return node;
}
}