org.apache.jackrabbit.oak.plugins.document.rdb.RDBJSONSupport Maven / Gradle / Ivy
/*
* 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.oak.plugins.document.rdb;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.TreeMap;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import org.apache.jackrabbit.oak.commons.json.JsopBuilder;
import org.apache.jackrabbit.oak.commons.json.JsopReader;
import org.apache.jackrabbit.oak.commons.json.JsopTokenizer;
import org.apache.jackrabbit.oak.plugins.document.DocumentNodeStore;
import org.apache.jackrabbit.oak.plugins.document.Revision;
import org.apache.jackrabbit.oak.plugins.document.StableRevisionComparator;
/**
* Utilities that provide JSON support on top of the existing
* {@link JsopTokenizer} support in oak-commons.
*
* The result of parsing uses the simplest possible Java representation of the
* JSON values (see Section 3 of RFC 7159), thus
*
* - {@code null}, {@link Boolean#TRUE}, {@link Boolean#FALSE}, {@link Number}
* , or {@link String}, or
*
- a {@link List} of representations, or
*
- a {@link Map}, mapping member names to representations.
*
*
* The boolean parameter of the constructor ({link
* {@link #RDBJSONSupport(boolean)}) allows changing the default for the maps to
* use sorted maps using {@link Revision}s as keys, as used internally be the
* {@link DocumentNodeStore}.
*/
public class RDBJSONSupport {
private final boolean useRevisionMaps;
/**
* @param useRevisionMaps
* whether to use revision maps instead of regular
* {@link Map}s.
*/
public RDBJSONSupport(boolean useRevisionMaps) {
this.useRevisionMaps = useRevisionMaps;
}
/**
* Parses the supplied JSON.
*/
@Nullable
public Object parse(@Nonnull String json) {
return parse(new JsopTokenizer(json));
}
/**
* Parses the supplied JSON.
*/
@Nullable
public Object parse(@Nonnull JsopTokenizer json) {
switch (json.read()) {
case JsopReader.NULL:
return null;
case JsopReader.TRUE:
return Boolean.TRUE;
case JsopReader.FALSE:
return Boolean.FALSE;
case JsopReader.NUMBER:
String t = json.getToken();
try {
return Long.parseLong(t);
}
catch (NumberFormatException ex) {
return Double.parseDouble(t);
}
case JsopReader.STRING:
return json.getToken();
case '{':
if (useRevisionMaps) {
Map map = new TreeMap(StableRevisionComparator.REVERSE);
while (true) {
if (json.matches('}')) {
break;
}
String k = json.readString();
if (k == null) {
throw new IllegalArgumentException("unexpected null revision");
}
json.read(':');
map.put(Revision.fromString(k), parse(json));
json.matches(',');
}
return map;
} else {
Map map = new HashMap();
while (true) {
if (json.matches('}')) {
break;
}
String k = json.readString();
if (k == null) {
throw new IllegalArgumentException("unexpected null key");
}
json.read(':');
map.put(k, parse(json));
json.matches(',');
}
return map;
}
case '[':
List