/*
* Copyright 2002-2017 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 org.springframework.util.ClassUtils;
/**
* Simple factory to provide {@linkplain JsonObjectMapper}
* instances dependently of jackson-databind or boon libs in the classpath.
* If there are both libs in the classpath, it prefers Jackson 2 JSON-processor implementation.
* If there is not any of them, {@linkplain IllegalStateException} will be thrown.
*
* @author Artem Bilan
* @author Gary Russell
* @since 3.0
*
* @see Jackson2JsonObjectMapper
* @see org.springframework.integration.support.json.BoonJsonObjectMapper
*/
public final class JsonObjectMapperProvider {
private static final ClassLoader classLoader = JsonObjectMapperProvider.class.getClassLoader();
private static final boolean boonPresent =
ClassUtils.isPresent("org.boon.json.ObjectMapper", classLoader);
private JsonObjectMapperProvider() {
super();
}
/**
* Return an object mapper if available.
* @return the mapper.
* @throws IllegalStateException if an implementation is not available.
*/
public static JsonObjectMapper<?, ?> newInstance() {
if (JacksonPresent.isJackson2Present()) {
return new Jackson2JsonObjectMapper();
}
else if (boonPresent) {
return new BoonJsonObjectMapper();
}
else {
throw new IllegalStateException("Neither jackson-databind.jar, nor boon.jar is present in the classpath.");
}
}
/**
* Returns true if a supported JSON implementation is on the class path.
* @return true if {@link #newInstance()} will return a mapper.
* @since 4.2.7
*/
public static boolean jsonAvailable() {
return JacksonPresent.isJackson2Present() || boonPresent;
}
}