com.azaptree.services.commons.xml.jaxb.JAXBContextCache.java Source code

Introduction

Here is the source code for com.azaptree.services.commons.xml.jaxb.JAXBContextCache.java

Source

package com.azaptree.services.commons.xml.jaxb;

/*
 * #%L
 * AZAPTREE-SERVICES-COMMONS
 * %%
 * Copyright (C) 2012 - 2013 AZAPTREE.COM
 * %%
 * 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.
 * #L%
 */

import java.util.HashMap;
import java.util.Map;

import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;

import org.slf4j.LoggerFactory;
import org.springframework.util.Assert;

/**
 * Used to cache JAXBContexts at the JVM level
 * 
 * @author alfio
 * 
 */
public abstract class JAXBContextCache {

    private static final Map<String /* JAXB context path */, JAXBContext> jaxbContexts = new HashMap<>();

    /**
     * If the JAXBContext is not cached, then it will create a new instance and cache it.
     * 
     * @param contextPath
     *            REQUIRED
     * @return
     */
    public static JAXBContext get(final String contextPath) {
        Assert.hasText(contextPath, "contextPath is required");
        JAXBContext ctx = jaxbContexts.get(contextPath);
        if (ctx == null) {
            try {
                ctx = JAXBContext.newInstance(contextPath);
            } catch (final JAXBException e) {
                throw new IllegalArgumentException(
                        "Failed to create JAXBContext - invalid JAXB context path: " + contextPath, e);
            }
            jaxbContexts.put(contextPath, ctx);
            LoggerFactory.getLogger(JAXBContextCache.class).info("cached : {}", contextPath);
        }
        return ctx;
    }

}