/*
 * Copyright (c) 2002-2012 Alibaba Group Holding Limited.
 * All rights reserved.
 *
 * 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 com.alibaba.antx.config.props;

import java.io.File;
import java.net.URI;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
import java.util.TreeSet;

import com.alibaba.antx.config.generator.PropertiesLoader;
import com.alibaba.antx.config.resource.Resource;
import com.alibaba.antx.config.resource.ResourceManager;
import com.alibaba.antx.config.resource.ResourceURI;

/**
 * 代表一个props文件。
 *
 * @author Michael Zhou
 */
public class PropertiesFile extends PropertiesResource {
    protected Set keys;
    protected Map props;

    protected PropertiesFile(ResourceManager manager) {
        super(manager);
    }

    public PropertiesFile(ResourceManager manager, String file) {
        super(manager);
        setURI(ResourceURI.guessURI(file));
    }

    public PropertiesFile(ResourceManager manager, File file) {
        super(manager);
        setURI(file);
    }

    public PropertiesFile(ResourceManager manager, URI uri) {
        super(manager);
        setURI(uri);
    }

    public PropertiesFile(ResourceManager manager, Resource res) {
        super(manager);
        setResource(res);
        setURI(res.getURI().getURI());
    }

    public Set getKeys() {
        load();
        return keys;
    }

    public Map getProperties() {
        load();
        return props;
    }

    @Override
    protected void onLoad() {
        Map propsFromFile = PropertiesLoader.loadPropertiesFile(getResource().getInputStream(), getCharset(), getURI()
                .toString());

        keys = new TreeSet(propsFromFile.keySet());
        props = new HashMap();

        PropertiesLoader.mergeProperties(props, propsFromFile);
    }

    @Override
    protected void onError() {
        keys = new TreeSet();
        props = new HashMap();
    }
}