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package com.jchanghong.core.io.resource;

import com.jchanghong.core.io.IORuntimeException;
import com.jchanghong.core.io.IoUtil;

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.Serializable;
import java.net.URL;
import java.nio.charset.Charset;

/**
 * 基于{@link InputStream}的资源获取器

 * 注意：此对象中getUrl方法始终返回null
 * 
 * @author looly
 * @since 4.0.9
 */
public class InputStreamResource implements Resource, Serializable {
	private static final long serialVersionUID = 1L;

	private final InputStream in;
	private final String name;

	/**
	 * 构造
	 * 
	 * @param in {@link InputStream}
	 */
	public InputStreamResource(InputStream in) {
		this(in, null);
	}
	
	/**
	 * 构造
	 * 
	 * @param in {@link InputStream}
	 * @param name 资源名称
	 */
	public InputStreamResource(InputStream in, String name) {
		this.in = in;
		this.name = name;
	}
	
	@Override
	public String getName() {
		return this.name;
	}

	@Override
	public URL getUrl() {
		return null;
	}

	@Override
	public InputStream getStream() {
		return this.in;
	}

	@Override
	public BufferedReader getReader(Charset charset) {
		return IoUtil.getReader(this.in, charset);
	}

	@Override
	public String readStr(Charset charset) throws IORuntimeException {
		BufferedReader reader = null;
		try {
			reader = getReader(charset);
			return IoUtil.read(reader);
		} finally {
			IoUtil.close(reader);
		}
	}

	@Override
	public byte[] readBytes() throws IORuntimeException {
		InputStream in = null;
		try {
			in = getStream();
			return IoUtil.readBytes(in);
		} finally {
			IoUtil.close(in);
		}
	}

}