/*
* Copyright 2004-2008 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.grails.web.converters.marshaller.json;
import grails.converters.JSON;
import groovy.lang.GroovySystem;
import groovy.lang.MetaClass;
import groovy.lang.MetaMethod;
import org.codehaus.groovy.grails.web.json.JSONWriter;
import org.grails.web.converters.exceptions.ConverterException;
import org.grails.web.converters.marshaller.ObjectMarshaller;
/**
* @author Siegfried Puchbauer
* @since 1.1
*/
public class InstanceMethodBasedMarshaller implements ObjectMarshaller<JSON> {
public boolean supports(Object object) {
return getToJSONMethod(object) != null;
}
public void marshalObject(Object object, JSON converter) throws ConverterException {
MetaMethod method = getToJSONMethod(object);
try {
Object result = method.invoke(object, new Object[]{ converter });
if (result != null && !(result instanceof JSON) && !(result instanceof JSONWriter)) {
converter.convertAnother(result);
}
}
catch(Throwable e) {
throw e instanceof ConverterException ? (ConverterException)e :
new ConverterException("Error invoking toJSON method of object with class " + object.getClass().getName(),e);
}
}
protected MetaMethod getToJSONMethod(Object object) {
MetaClass mc = GroovySystem.getMetaClassRegistry().getMetaClass(object.getClass());
if (mc != null) {
return mc.getMetaMethod("toJSON", new Object[] { JSON.class });
}
return null;
}
}