JaxbUnmarshaller.java

/*
 * 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 com.github.rmannibucau.featuredmock.mock.unmarshaller.jaxb;

import com.github.rmannibucau.featuredmock.mock.unmarshaller.Unmarshaller;

import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBElement;
import javax.xml.bind.JAXBException;
import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.Type;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;

public class JaxbUnmarshaller implements Unmarshaller {
    private static final ConcurrentMap<Type, JAXBContext> CACHE = new ConcurrentHashMap<Type, JAXBContext>();

    @Override
    public Object unmarshall(final Type clazz, final InputStream is) throws IOException {
        try {
            JAXBContext ctx = CACHE.get(clazz);
            if (ctx == null) {
                ctx = JAXBContext.newInstance(Class.class.cast(clazz));
                CACHE.putIfAbsent(clazz, ctx);
            }

            final Object obj = ctx.createUnmarshaller().unmarshal(is);
            if (JAXBElement.class.isInstance(obj)) {
                return JAXBElement.class.cast(obj).getValue();
            }
            return obj;
        } catch (final JAXBException e) {
            e.printStackTrace();
            return null;
        }
    }

    @Override
    public boolean accept(final String extension) {
        return ".xml".equals(extension);
    }
}