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Azolla.org Core Library for Java
There is a newer version: 2.0.3
/*
 * @(#)Cfg0.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.l.ling.cfg;

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

import javax.annotation.Nullable;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.Marshaller;

import org.azolla.l.ling.io.Encoding0;
import org.azolla.l.ling.text.Fmt0;
import org.azolla.l.ling.util.KV;
import org.azolla.l.ling.util.Log0;

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

/**
 * Cfg0
 *
 * @author [email protected]
 * @since ADK1.0
 */
public final class Cfg0
{
    private static final LoadingCache, JAXBContext> CACHE = CacheBuilder.newBuilder().softValues().build(ConfigLoader.single());

    private static class ConfigLoader extends CacheLoader, JAXBContext>
    {
        private static ConfigLoader instance;

        private ConfigLoader()
        {

        }

        public static ConfigLoader single()
        {
            return null == instance ? new ConfigLoader() : instance;
        }

        @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 unmarshal(Class clazz, File file)
    {
        T rtnT = null;

        try
        {
            rtnT = (T) getJAXBContext(clazz).createUnmarshaller().unmarshal(file);
        }
        catch (Exception e)
        {
            Log0.error(Cfg0.class, Fmt0.LOG_P, KV.ins("clazz", clazz).put("filePath", file), e);
            rtnT = null;
        }

        return rtnT;
    }

    public static  boolean marshal(T t, File file)
    {
        return marshal(t, file, Encoding0.UTF_8);
    }

    //encoding [null to {@code Encoding#UTF8}]
    public static  boolean marshal(T t, File file, @Nullable String encoding)
    {
        boolean rtnBoolean = true;
        encoding = Strings.isNullOrEmpty(encoding) ? Encoding0.UTF_8 : encoding;
        try
        {
            Marshaller m = getJAXBContext(t.getClass()).createMarshaller();
            m.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
            m.setProperty(Marshaller.JAXB_ENCODING, encoding);
            m.marshal(t, file);
        }
        catch (Exception e)
        {
            Log0.error(Cfg0.class, Fmt0.LOG_P, KV.ins("t", t).put("file", file).put("encoding", encoding), e);
            rtnBoolean = false;
        }

        return rtnBoolean;
    }
}