/*
* Copyright 2012-2014 Brian Campbell
*
* 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.jose4j.json;
import org.jose4j.json.internal.json_simple.parser.ContainerFactory;
import org.jose4j.json.internal.json_simple.parser.JSONParser;
import org.jose4j.json.internal.json_simple.JSONValue;
import org.jose4j.json.internal.json_simple.parser.ParseException;
import org.jose4j.lang.JoseException;
import java.io.IOException;
import java.io.Writer;
import java.util.*;
/**
* This class should be the point of contact for JSON processing.
*
* The code in the internal.json_simple package was originally taken from the Apache 2.0 licensed json-simple
* source code (changing the package). I'm a little uneasy about it. But json-simple hasn't changed much in years
* and jose4j only needs fairly basic JSON processing. Doing this lets me remove one more dependency
* and avoid any potential dependency conflicts. It also will let me to make changes to the JSON processing
* like not escaping forward slashes. There’s some risk in this but moving to a new/different processor
* in the future isn’t really made particularly more difficult by this (as long as this class is the touch point
* for JSON processing).
*/
public class JsonUtil
{
private static final ContainerFactory CONTAINER_FACTORY = new ContainerFactory()
{
public List creatArrayContainer()
{
return new ArrayList<Object>();
}
public Map createObjectContainer()
{
return new DupeKeyDisallowingLinkedHashMap();
}
};
public static Map<String,Object> parseJson(String jsonString) throws JoseException
{
try
{
JSONParser parser = new JSONParser();
return (DupeKeyDisallowingLinkedHashMap)parser.parse(jsonString, CONTAINER_FACTORY);
}
catch (ParseException | IllegalArgumentException e)
{
throw new JoseException("Parsing error: " + e, e);
}
}
public static String toJson(Map<String,?> map)
{
return JSONValue.toJSONString(map);
}
public static void writeJson(Map<String,?> map, Writer w) throws IOException
{
JSONValue.writeJSONString(map, w);
}
static class DupeKeyDisallowingLinkedHashMap extends LinkedHashMap<String,Object>
{
@Override
public Object put(String key, Object value)
{
if (this.containsKey(key))
{
throw new IllegalArgumentException("An entry for '" + key + "' already exists. Parameter names must be unique.");
}
return super.put(key, value);
}
}
}