/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 org.apache.jmeter.protocol.http.util;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.InetAddress;
import java.net.Socket;
import java.net.UnknownHostException;

/*
 * Socket that reads back from the output
 */
public class LoopbackHTTPSocket extends Socket {

	// get access to buffer
	static class LoopbackOutputStream extends ByteArrayOutputStream{
		byte [] getBuffer() {
			return buf;
		}
	}

	// wrap read() methods to track output buffer
	static class LoopBackInputStream extends ByteArrayInputStream{
		LoopbackOutputStream os;
		public synchronized int read() {
			buf=os.getBuffer();   // make sure buffer details
			count=buf.length; // track the output
			return super.read();
		}
		public synchronized int read(byte[] b, int off, int len) {
			buf=os.getBuffer();
			count=buf.length;
			return super.read(b, off, len);
		}
		
		public LoopBackInputStream(LoopbackOutputStream _os) {
			super(_os.getBuffer());
			os=_os;
		}		
	}
	
	private final LoopbackOutputStream os;
	
	private LoopbackHTTPSocket() throws IOException{
		os=new LoopbackOutputStream();
		// Preload the output so that can be read back as HTTP
		os.write("HTTP/1.1 200 OK\r\nContent-Type: text/plain\r\n\r\n".getBytes());
	}
	
    public LoopbackHTTPSocket(String host, int port, InetAddress localAddress, int localPort, int timeout) throws IOException {
    	this();
	}

    public LoopbackHTTPSocket(String host, int port, InetAddress localAddr, int localPort) throws IOException {
    	this();
    }

    public LoopbackHTTPSocket(String host, int port) throws UnknownHostException, IOException {
    	this();
    }

	// Override so we can intercept the stream
    public OutputStream getOutputStream() throws IOException {
        return os;
    }
    
    // Override so we can intercept the stream
    public InputStream getInputStream() throws IOException {
        return new LoopBackInputStream(os);
    }
}