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/*
 * Copyright (C) 2006-2010 Alfresco Software Limited.
 *
 * This file is part of Alfresco
 *
 * Alfresco is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Alfresco 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with Alfresco. If not, see .
 */

package org.filesys.smb.dcerpc;

/**
 * Policy Handle Class
 *
 * @author gkspencer
 */
public class PolicyHandle {

    //	Length of a policy handle
    public static final int POLICY_HANDLE_SIZE = 20;

    //	Policy handle bytes
    private byte[] m_handle;

    //	Handle name
    private String m_name;

    /**
     * Default constructor
     */
    public PolicyHandle() {
        setName("");
    }

    /**
     * Class constructor
     *
     * @param buf byte[]
     * @param off int
     */
    public PolicyHandle(byte[] buf, int off) {
        initialize(buf, off);
        setName("");
    }

    /**
     * Class constructor
     *
     * @param name String
     * @param buf  byte[]
     * @param off  int
     */
    public PolicyHandle(String name, byte[] buf, int off) {
        initialize(buf, off);
        setName(name);
    }

    /**
     * Determine if the policy handle is valid
     *
     * @return boolean
     */
    public final boolean isValid() {
        return m_handle != null ? true : false;
    }

    /**
     * Return the policy handle bytes
     *
     * @return byte[]
     */
    public final byte[] getBytes() {
        return m_handle;
    }

    /**
     * Return the policy handle name
     *
     * @return String
     */
    public final String getName() {
        return m_name;
    }

    /**
     * Set the policy handle name
     *
     * @param name String
     */
    public final void setName(String name) {
        m_name = name;
    }

    /**
     * Store the policy handle into the specified buffer
     *
     * @param buf byte[]
     * @param off int
     * @return int
     */
    public final int storePolicyHandle(byte[] buf, int off) {

        //	Check if the policy handle is valid
        if (isValid() == false)
            return -1;

        //	Copy the policy handle bytes to the user buffer
        for (int i = 0; i < POLICY_HANDLE_SIZE; i++)
            buf[off + i] = m_handle[i];

        //	Return the new buffer position
        return off + POLICY_HANDLE_SIZE;
    }

    /**
     * Load the policy handle from the specified buffer
     *
     * @param buf byte[]
     * @param off int
     * @return int
     */
    public final int loadPolicyHandle(byte[] buf, int off) {

        //	Load the policy handle from the buffer
        initialize(buf, off);
        return off + POLICY_HANDLE_SIZE;
    }

    /**
     * Clear the handle
     */
    protected final void clearHandle() {
        m_handle = null;
    }

    /**
     * Initialize the policy handle
     *
     * @param buf byte[]
     * @param off int
     */
    private final void initialize(byte[] buf, int off) {

        //	Copy the policy handle bytes
        if ((off + POLICY_HANDLE_SIZE) <= buf.length) {

            //	Allocate the policy handle buffer
            m_handle = new byte[POLICY_HANDLE_SIZE];

            //	Copy the policy handle
            for (int i = 0; i < POLICY_HANDLE_SIZE; i++)
                m_handle[i] = buf[off + i];
        }
    }

    /**
     * Return the policy handle as a string
     *
     * @return String
     */
    public String toString() {
        StringBuffer str = new StringBuffer();

        str.append("[");

        if (getName() != null)
            str.append(getName());
        str.append(":");

        if (isValid()) {
            for (int i = 0; i < POLICY_HANDLE_SIZE; i++) {
                int val = (m_handle[i] & 0xFF);
                if (val <= 16)
                    str.append("0");
                str.append(Integer.toHexString(val).toUpperCase());
                str.append("-");
            }
            str.setLength(str.length() - 1);
            str.append("]");
        }

        return str.toString();
    }
}