/*

 * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package com.oracle.java.testlibrary.dcmd;

import java.io.File;

import java.io.IOException;

import java.io.PrintWriter;

import java.util.Arrays;

import java.util.List;

/**

 * Executes Diagnostic Commands on the target VM (specified by pid) using the jcmd tool and its ability to read

 *          Diagnostic Commands from a file.

 */

public class FileJcmdExecutor extends PidJcmdExecutor {

    /**

     * Instantiates a new FileJcmdExecutor targeting the current VM

     */

    public FileJcmdExecutor() {

        super();

    }

    /**

     * Instantiates a new FileJcmdExecutor targeting the VM indicated by the given pid

     *

     * @param target Pid of the target VM

     */

    public FileJcmdExecutor(String target) {

        super(target);

    }

    protected List<String> createCommandLine(String cmd) throws CommandExecutorException {

        File cmdFile = createTempFile();

        writeCommandToTemporaryFile(cmd, cmdFile);

        return Arrays.asList(jcmdBinary, Integer.toString(pid),

                "-f", cmdFile.getAbsolutePath());

    }

    private void writeCommandToTemporaryFile(String cmd, File cmdFile) {

        try (PrintWriter pw = new PrintWriter(cmdFile)) {

            pw.println(cmd);

        } catch (IOException e) {

            String message = "Could not write to file: " + cmdFile.getAbsolutePath();

            throw new CommandExecutorException(message, e);

        }

    }

    private File createTempFile() {

        try {

            File cmdFile = File.createTempFile("input", "jcmd");

            cmdFile.deleteOnExit();

            return cmdFile;

        } catch (IOException e) {

            throw new CommandExecutorException("Could not create temporary file", e);

        }

    }

}