org.azolla.model.XmlConfigures.java Source code

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Here is the source code for org.azolla.model.XmlConfigures.java

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/*
 * @(#)ModelHelper.java      Created at 2013-2-24
 * 
 * Copyright (c) 2011-2013 azolla.org All rights reserved.
 * Azolla PROPRIETARY/CONFIDENTIAL. Use is subject to license terms. 
 */
package org.azolla.model;

import java.io.File;
import java.util.concurrent.ExecutionException;

import javax.xml.bind.JAXBContext;

import org.azolla.exception.AzollaException;
import org.azolla.exception.code.AzollaCode;

import com.google.common.base.Strings;
import com.google.common.cache.CacheBuilder;
import com.google.common.cache.CacheLoader;
import com.google.common.cache.LoadingCache;

/**
 * Help for model
 *
 * @author    sk@azolla.org
 * @version 1.0.0
 * @since    ADK1.0
 */
public class XmlConfigures {
    private static final LoadingCache<Class<?>, JAXBContext> CACHE = CacheBuilder.newBuilder().softValues()
            .build(new ModelLoader());

    private static class ModelLoader extends CacheLoader<Class<?>, JAXBContext> {

        /**
         * @see com.google.common.cache.CacheLoader#load(java.lang.Object)
         * @param key
         * @return
         * @throws ExceptionF
         */
        @Override
        public JAXBContext load(Class<?> key) throws Exception {
            return JAXBContext.newInstance(key);
        }
    }

    private static JAXBContext getJAXBContext(Class<?> clazz) throws ExecutionException {
        return CACHE.get(clazz);
    }

    @SuppressWarnings("unchecked")
    public static <T> T unmarshal(Class<T> clazz, String filePath) {
        try {
            return (T) getJAXBContext(clazz).createUnmarshaller()
                    .unmarshal(new File(Strings.nullToEmpty(filePath)));
        } catch (Exception e) {
            return null;
        }
    }

    public static <T> void marshal(T t, String filePath) {
        try {
            getJAXBContext(t.getClass()).createMarshaller().marshal(t, new File(Strings.nullToEmpty(filePath)));
        } catch (Exception e) {
            throw new AzollaException(AzollaCode.MODELHELPER_MARSHAL, e).set("t", t).set("filePath", filePath);
        }
    }
}