/*
* 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.json;
import org.apache.jackrabbit.mk.json.JsopBuilder;
import org.apache.jackrabbit.mk.model.tree.ChildNode;
import org.apache.jackrabbit.mk.model.tree.NodeState;
import org.apache.jackrabbit.mk.model.tree.PropertyState;
import org.apache.jackrabbit.mk.util.NameFilter;
import org.apache.jackrabbit.mk.util.NodeFilter;
import org.apache.jackrabbit.mongomk.util.MongoUtil;
import org.json.JSONArray;
import org.json.JSONObject;
import com.mongodb.BasicDBList;
/**
* JSON related utility class.
*/
public class JsonUtil {
public static Object toJsonValue(String jsonValue) throws Exception {
if (jsonValue == null) {
return null;
}
JSONObject jsonObject = new JSONObject("{dummy : " + jsonValue + "}");
Object obj = jsonObject.get("dummy");
return convertJsonValue(obj);
}
private static Object convertJsonValue(Object jsonObject) throws Exception {
if (jsonObject == JSONObject.NULL) {
return null;
}
if (jsonObject instanceof JSONArray) {
// DBList is needed in order to cache node properties correctly.
BasicDBList elements = new BasicDBList();
JSONArray dummyArray = (JSONArray) jsonObject;
for (int i = 0; i < dummyArray.length(); ++i) {
Object raw = dummyArray.get(i);
Object parsed = convertJsonValue(raw);
elements.add(parsed);
}
return elements;
}
return jsonObject;
}
// Most of this method borrowed from MicroKernelImpl#toJson. It'd be nice if
// this somehow consolidated with MicroKernelImpl#toJson.
public static void toJson(JsopBuilder builder, NodeState node, int depth,
int offset, int maxChildNodes, boolean inclVirtualProps, NodeFilter filter) {
for (PropertyState property : node.getProperties()) {
if (filter == null || filter.includeProperty(property.getName())) {
String propertyName = property.getName();
builder.key(MongoUtil.fromMongoPropertyKey(propertyName)).encodedValue(property.getEncodedValue());
}
}
long childCount = node.getChildNodeCount();
if (inclVirtualProps) {
if (filter == null || filter.includeProperty(":childNodeCount")) {
// :childNodeCount is by default always included
// unless it is explicitly excluded in the filter
builder.key(":childNodeCount").value(childCount);
}
}
if (childCount <= 0 || depth < 0) {
return;
}
if (filter != null) {
NameFilter childFilter = filter.getChildNodeFilter();
if (childFilter != null && !childFilter.containsWildcard()) {
// Optimization for large child node lists:
// no need to iterate over the entire child node list if the filter
// does not include wildcards
int count = maxChildNodes == -1 ? Integer.MAX_VALUE : maxChildNodes;
for (String name : childFilter.getInclusionPatterns()) {
NodeState child = node.getChildNode(name);
if (child != null) {
boolean incl = true;
for (String exclName : childFilter.getExclusionPatterns()) {
if (name.equals(exclName)) {
incl = false;
break;
}
}
if (incl) {
if (count-- <= 0) {
break;
}
builder.key(name).object();
if (depth > 0) {
toJson(builder, child, depth - 1, 0, maxChildNodes, inclVirtualProps, filter);
}
builder.endObject();
}
}
}
return;
}
}
int count = maxChildNodes;
if (count != -1 && filter != null && filter.getChildNodeFilter() != null) {
// Specific maxChildNodes limit and child node filter
count = -1;
}
int numSiblings = 0;
for (ChildNode entry : node.getChildNodeEntries(offset, count)) {
if (filter == null || filter.includeNode(entry.getName())) {
if (maxChildNodes != -1 && ++numSiblings > maxChildNodes) {
break;
}
builder.key(entry.getName()).object();
if (depth > 0) {
toJson(builder, entry.getNode(), depth - 1, 0, maxChildNodes, inclVirtualProps, filter);
}
builder.endObject();
}
}
}
}