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/*
* Copyright (c) 2008-2014 the original author or authors.
*
* 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.cometd.common;
import java.io.IOException;
import java.io.InputStream;
import java.io.Reader;
import java.text.ParseException;
import org.codehaus.jackson.map.ObjectMapper;
import org.codehaus.jackson.type.JavaType;
import org.cometd.bayeux.Message;
public abstract class JacksonJSONContext
{
private final ObjectMapper objectMapper = new ObjectMapper();
private final JavaType rootArrayType;
protected JacksonJSONContext()
{
rootArrayType = objectMapper.constructType(rootArrayClass());
}
public ObjectMapper getObjectMapper()
{
return objectMapper;
}
protected abstract Class rootArrayClass();
public T[] parse(InputStream stream) throws ParseException
{
try
{
return getObjectMapper().readValue(stream, rootArrayType);
}
catch (IOException x)
{
throw (ParseException)new ParseException("", -1).initCause(x);
}
}
public T[] parse(Reader reader) throws ParseException
{
try
{
return getObjectMapper().readValue(reader, rootArrayType);
}
catch (IOException x)
{
throw (ParseException)new ParseException("", -1).initCause(x);
}
}
public T[] parse(String json) throws ParseException
{
try
{
return getObjectMapper().readValue(json, rootArrayType);
}
catch (IOException x)
{
throw (ParseException)new ParseException(json, -1).initCause(x);
}
}
public String generate(T message)
{
try
{
return getObjectMapper().writeValueAsString(message);
}
catch (IOException x)
{
throw new RuntimeException(x);
}
}
public String generate(T[] messages)
{
try
{
return getObjectMapper().writeValueAsString(messages);
}
catch (IOException x)
{
throw new RuntimeException(x);
}
}
public JSONContext.Parser getParser()
{
return new ObjectMapperParser();
}
public JSONContext.Generator getGenerator()
{
return new ObjectMapperGenerator();
}
private class ObjectMapperParser implements JSONContext.Parser
{
public T parse(Reader reader, Class type) throws ParseException
{
try
{
return getObjectMapper().readValue(reader, type);
}
catch (IOException x)
{
throw (ParseException)new ParseException("", -1).initCause(x);
}
}
}
private class ObjectMapperGenerator implements JSONContext.Generator
{
public String generate(Object object)
{
try
{
return getObjectMapper().writeValueAsString(object);
}
catch (IOException x)
{
throw new RuntimeException(x);
}
}
}
}
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