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/*
* 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.tuscany.sca.databinding.json;
import java.beans.BeanInfo;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.lang.reflect.Array;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.Comparator;
import org.apache.tuscany.sca.databinding.PullTransformer;
import org.apache.tuscany.sca.databinding.SimpleTypeMapper;
import org.apache.tuscany.sca.databinding.TransformationContext;
import org.apache.tuscany.sca.databinding.TransformationException;
import org.apache.tuscany.sca.databinding.impl.BaseTransformer;
import org.apache.tuscany.sca.databinding.impl.SimpleTypeMapperImpl;
import org.apache.tuscany.sca.databinding.javabeans.JavaBeansDataBinding;
import org.apache.tuscany.sca.interfacedef.util.TypeInfo;
import org.codehaus.jettison.json.JSONArray;
import org.codehaus.jettison.json.JSONObject;
public class JavaBean2JSONObject extends BaseTransformer<Object, Object> implements PullTransformer<Object, Object> {
private static final SimpleTypeMapper SIMPLE_TYPE_MAPPER = new SimpleTypeMapperImpl();
private static final Comparator<PropertyDescriptor> COMPARATOR = new Comparator<PropertyDescriptor>() {
public int compare(PropertyDescriptor o1, PropertyDescriptor o2) {
return o1.getName().compareTo(o2.getName());
}
};
private static final SimpleTypeMapperImpl MAPPER = new SimpleTypeMapperImpl();
private static final Object[] NULL = null;
private static String getStringValue(Object o) {
if (o == null) {
return null;
}
TypeInfo info = SIMPLE_TYPE_MAPPER.getXMLType(o.getClass());
if (info != null) {
return MAPPER.toXMLLiteral(info.getQName(), o, null);
} else {
return String.valueOf(o);
}
}
private static boolean isSimpleType(Class<?> javaType) {
return SIMPLE_TYPE_MAPPER.getXMLType(javaType) != null;
}
public JavaBean2JSONObject() {
}
@Override
public String getSourceDataBinding() {
return JavaBeansDataBinding.NAME;
}
@Override
protected Class<Object> getSourceType() {
return Object.class;
}
@Override
public String getTargetDataBinding() {
return JSONDataBinding.NAME;
}
@Override
protected Class<Object> getTargetType() {
return Object.class;
}
public Object toJSON(Object source) throws Exception {
if (source == null) {
return JSONObject.NULL;
}
Class<?> type = source.getClass();
if (isSimpleType(type)) {
return source;
} else if (type.isArray()) {
JSONArray array = new JSONArray();
int i1 = Array.getLength(source);
for (int j = 0; j < i1; j++) {
Object o = Array.get(source, j);
array.put(toJSON(o));
}
return array;
} else if (Collection.class.isAssignableFrom(type)) {
Collection c = (Collection)source;
JSONArray array = new JSONArray();
for (Object element : c) {
array.put(toJSON(element));
}
return array;
}
JSONObject json = new JSONObject();
BeanInfo beanInfo = Introspector.getBeanInfo(type);
PropertyDescriptor[] propDescs = beanInfo.getPropertyDescriptors();
Collections.sort(Arrays.asList(propDescs), COMPARATOR);
for (int i = 0; i < propDescs.length; i++) {
PropertyDescriptor propDesc = propDescs[i];
Class<?> pType = propDesc.getPropertyType();
if ("class".equals(propDesc.getName())) {
continue;
}
Object pValue = propDesc.getReadMethod().invoke(source, NULL);
json.put(propDesc.getName(), toJSON(pValue));
}
return json;
}
public Object transform(Object source, TransformationContext context) {
try {
return toJSON(source);
} catch (Exception e) {
throw new TransformationException(e);
}
}
}
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