/*
* Copyright 2013-2016 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.springframework.integration.support.json;
import java.io.Writer;
import java.lang.reflect.Type;
import java.util.Collection;
import java.util.Map;
import org.springframework.integration.mapping.support.JsonHeaders;
/**
* Simple {@linkplain JsonObjectMapper} adapter implementation, if there is no need
* to provide entire operations implementation.
*
* @author Artem Bilan
* @author Gary Russell
* @since 3.0
*/
public abstract class JsonObjectMapperAdapter<N, P> implements JsonObjectMapper<N, P> {
@Override
public String toJson(Object value) throws Exception {
return null;
}
@Override
public void toJson(Object value, Writer writer) throws Exception {
}
@Override
public N toJsonNode(Object value) throws Exception {
return null;
}
@Override
public <T> T fromJson(Object json, Class<T> valueType) throws Exception {
return null;
}
@Override
public <T> T fromJson(P parser, Type valueType) throws Exception {
return null;
}
@Override
public <T> T fromJson(Object json, Map<String, Object> javaTypes) throws Exception {
return null;
}
@Override
public void populateJavaTypes(Map<String, Object> map, Object object) {
map.put(JsonHeaders.TYPE_ID, object.getClass());
if (object instanceof Collection && !((Collection<?>) object).isEmpty()) {
Object firstElement = ((Collection<?>) object).iterator().next();
map.put(JsonHeaders.CONTENT_TYPE_ID, firstElement != null ? firstElement.getClass() : Object.class);
}
if (object instanceof Map && !((Map<?, ?>) object).isEmpty()) {
Object firstValue = ((Map<?, ?>) object).values().iterator().next();
map.put(JsonHeaders.CONTENT_TYPE_ID, firstValue != null ? firstValue.getClass() : Object.class);
Object firstKey = ((Map<?, ?>) object).keySet().iterator().next();
map.put(JsonHeaders.KEY_TYPE_ID, firstKey != null ? firstKey.getClass() : Object.class);
}
}
}