src/org/hsqldb/ClientConnectionHTTP.java

/* Copyright (c) 2001-2010, The HSQL Development Group
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * Neither the name of the HSQL Development Group nor the names of its
 * contributors may be used to endorse or promote products derived from this
 * software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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 * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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package org.hsqldb;

import java.io.IOException;
import java.io.OutputStream;

import org.hsqldb.lib.InOutUtil;
import org.hsqldb.result.Result;

/**
 * HTTP protocol session proxy implementation. Uses the updated HSQLDB HTTP
 * sub protocol.
 *
 * @author Fred Toussi (fredt@users dot sourceforge.net)
 * @version 1.9.0
 * @since 1.7.2
 */
public class ClientConnectionHTTP extends ClientConnection {

    static final String ENCODING = "8859_1";
    static final int    IDLENGTH = 12;    // length of int + long for db and session IDs

    public ClientConnectionHTTP(String host, int port, String path,
                                String database, boolean isTLS, String user,
                                String password, int timeZoneSeconds) {
        super(host, port, path, database, isTLS, user, password,
              timeZoneSeconds);
    }

    protected void initConnection(String host, int port, boolean isTLS) {}

    public synchronized Result execute(Result r) {

        super.openConnection(host, port, isTLS);

        Result result = super.execute(r);

        super.closeConnection();

        return result;
    }

    protected void write(Result r) throws IOException, HsqlException {

        dataOutput.write("POST ".getBytes(ENCODING));
        dataOutput.write(path.getBytes(ENCODING));
        dataOutput.write(" HTTP/1.0\r\n".getBytes(ENCODING));
        dataOutput.write(
            "Content-Type: application/octet-stream\r\n".getBytes(ENCODING));
        dataOutput.write(("Content-Length: " + rowOut.size() + IDLENGTH
                          + "\r\n").getBytes(ENCODING));
        dataOutput.write("\r\n".getBytes(ENCODING));
        dataOutput.writeInt(r.getDatabaseId());
        dataOutput.writeLong(r.getSessionId());
        r.write(dataOutput, rowOut);
    }

    protected Result read() throws IOException, HsqlException {

        // fredt - for WebServer 4 lines should be skipped
        // for Servlet, number of lines depends on Servlet container
        // stop skipping after the blank line
        rowOut.reset();

        for (;;) {
            int count = InOutUtil.readLine(dataInput, (OutputStream) rowOut);

            if (count <= 2) {
                break;
            }
        }

        //
        Result result = Result.newResult(dataInput, rowIn);

        result.readAdditionalResults(this, dataInput, rowIn);

        return result;
    }

    protected void handshake() throws IOException {

        // We depend on the HTTP wrappings to assure end-to-end handshaking
    }
}