/*
 * Copyright 2011-2013 HTTL Team.
 *  
 * 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 httl.spi.loaders.resources;

import httl.Engine;
import httl.Resource;
import httl.util.IOUtils;

import java.io.IOException;
import java.io.Serializable;
import java.util.Locale;

/**
 * AbstractResource. (SPI, Prototype, ThreadSafe)
 *
 * @author Liang Fei (liangfei0201 AT gmail DOT com)
 * @see httl.spi.loaders.AbstractLoader#load(String, Locale, String)
 */
public abstract class AbstractResource implements Resource, Serializable {

    private static final long serialVersionUID = 6834431114838915042L;

    private final transient Engine engine;

    private final String name;

    private final String encoding;

    private final Locale locale;

    private final long lastModified;

    public AbstractResource(Engine engine, String name, Locale locale, String encoding) {
        this(engine, name, locale, encoding, -1);
    }

    public AbstractResource(Engine engine, String name, Locale locale, String encoding, long lastModified) {
        this.engine = engine;
        this.name = name;
        this.encoding = encoding;
        this.locale = locale;
        this.lastModified = lastModified;
    }

    public Engine getEngine() {
        return engine;
    }

    public String getName() {
        return name;
    }

    public String getEncoding() {
        return encoding;
    }

    public Locale getLocale() {
        return locale;
    }

    public long getLastModified() {
        return lastModified;
    }

    public long getLength() {
        return -1;
    }

    public String getSource() throws IOException {
        try {
            return IOUtils.readToString(openReader());
        } catch (IOException e) {
            throw new IllegalStateException(e.getMessage(), e);
        }
    }

    @Override
    public String toString() {
        return getName();
    }

}