cmsresource.java

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/*
 * File   : $Source: /usr/local/cvs/opencms/src/org/opencms/file/CmsResource.java,v $
 * Date   : $Date: 2007-08-24 13:20:51 $
 * Version: $Revision: 1.48 $
 *
 * This library is part of OpenCms -
 * the Open Source Content Management System
 *
 * Copyright (c) 2002 - 2007 Alkacon Software GmbH (http://www.alkacon.com)
 *
 * This library 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 2.1 of the License, or (at your option) any later version.
 *
 * This library 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.
 *
 * For further information about Alkacon Software GmbH, please see the
 * company website: http://www.alkacon.com
 *
 * For further information about OpenCms, please see the
 * project website: http://www.opencms.org
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package org.opencms.file;

import org.opencms.db.CmsResourceState;
import org.opencms.main.CmsIllegalArgumentException;
import org.opencms.util.A_CmsModeIntEnumeration;
import org.opencms.util.CmsStringUtil;
import org.opencms.util.CmsUUID;

import java.io.Serializable;
import java.util.Comparator;

/**
 * Base class for all OpenCms VFS resources like <code>{@link CmsFile}</code> or <code>{@link CmsFolder}</code>.<p>
 *
 * The OpenCms VFS resource is an important object for using the OpenCms API. 
 * Basically, all entries in the OpenCms VFS are considered to be "resources". 
 * Currently, only two types of resources exists:<ul>
 * <li>Files, which are represented by the subclass {@link CmsFile}.
 * <li>Folders (also called Directories), which are represented by the subclass {@link CmsFolder}.
 * </ul>
 * 
 * If you have a resource, you can use {@link #isFile()} or {@link #isFolder()} to learn what kind of 
 * subclass you have. Please note that this is usually not required, as the only real difference between a
 * {@link CmsFile} and a {@link CmsResource} is that the {@link CmsFile} also has the contents of the file,
 * which you can obtain using {@link CmsFile#getContents()}. As long as you don't need the content, you can
 * use the {@link CmsResource} for everything else. This is even more true for a {@link CmsFolder}, here you 
 * will need the subclass only in special cases, since the signature is identical to {@link CmsResource}.<p>
 * 
 * A OpenCms VFS resource can have any number of properties attached, which are represented by a {@link CmsProperty}.
 * To read the properties for a resource, use {@link CmsObject#readPropertyObject(CmsResource, String, boolean)}
 * or use {@link CmsObject#readPropertyObjects(CmsResource, boolean)} to read all properties of the resource.<p>
 *
 * @author Alexander Kandzior 
 * @author Michael Emmerich 
 * 
 * @version $Revision: 1.48 $
 * 
 * @since 6.0.0 
 */
public class CmsResource extends Object implements Cloneable, Serializable, Comparable {

    /**
     *  Enumeration class for resource copy modes.<p>
     */
    public static final class CmsResourceCopyMode extends A_CmsModeIntEnumeration {

        /** Copy mode for copy resources as new resource. */
        protected static final CmsResourceCopyMode MODE_COPY_AS_NEW = new CmsResourceCopyMode(1);

        /** Copy mode for copy resources as sibling. */
        protected static final CmsResourceCopyMode MODE_COPY_AS_SIBLING = new CmsResourceCopyMode(2);

        /** Copy mode to preserve siblings during copy. */
        protected static final CmsResourceCopyMode MODE_COPY_PRESERVE_SIBLING = new CmsResourceCopyMode(3);

        /** Version id required for safe serialization. */
        private static final long serialVersionUID = 9081630878178799137L;

        /**
         * Private constructor.<p>
         * 
         * @param mode the copy mode integer representation
         */
        private CmsResourceCopyMode(int mode) {

            super(mode);
        }

        /**
         * Returns the copy mode object from the old copy mode integer.<p>
         * 
         * @param mode the old copy mode integer
         * 
         * @return the copy mode object
         */
        public static CmsResourceCopyMode valueOf(int mode) {

            switch (mode) {
                case 1:
                    return CmsResourceCopyMode.MODE_COPY_AS_NEW;
                case 2:
                    return CmsResourceCopyMode.MODE_COPY_AS_SIBLING;
                case 3:
                default:
                    return CmsResourceCopyMode.MODE_COPY_PRESERVE_SIBLING;
            }
        }
    }

    /**
     *  Enumeration class for resource delete modes.<p>
     */
    public static final class CmsResourceDeleteMode extends A_CmsModeIntEnumeration {

        /** Signals that siblings of this resource should not be deleted. */
        protected static final CmsResourceDeleteMode MODE_DELETE_PRESERVE_SIBLINGS = new CmsResourceDeleteMode(1);

        /** Signals that siblings of this resource should be deleted. */
        protected static final CmsResourceDeleteMode MODE_DELETE_REMOVE_SIBLINGS = new CmsResourceDeleteMode(2);

        /** Version id required for safe serialization. */
        private static final long serialVersionUID = 2010402524576925865L;

        /**
         * Private constructor.<p>
         * 
         * @param mode the delete mode integer representation
         */
        private CmsResourceDeleteMode(int mode) {

            super(mode);
        }

        /**
         * Returns the delete mode object from the old delete mode integer.<p>
         * 
         * @param mode the old delete mode integer
         * 
         * @return the delete mode object
         */
        public static CmsResourceDeleteMode valueOf(int mode) {

            switch (mode) {
                case 1:
                    return CmsResourceDeleteMode.MODE_DELETE_PRESERVE_SIBLINGS;
                case 2:
                default:
                    return CmsResourceDeleteMode.MODE_DELETE_REMOVE_SIBLINGS;
            }
        }
    }

    /**
     *  Enumeration class for resource undo changes modes.<p>
     */
    public static final class CmsResourceUndoMode extends A_CmsModeIntEnumeration {

        /** Indicates that the undo method will only undo content changes. */
        public static final CmsResourceUndoMode MODE_UNDO_CONTENT = new CmsResourceUndoMode(1);

        /** Indicates that the undo method will only recursive undo content changes. */
        public static final CmsResourceUndoMode MODE_UNDO_CONTENT_RECURSIVE = new CmsResourceUndoMode(2);

        /** Indicates that the undo method will undo move operations and content changes. */
        public static final CmsResourceUndoMode MODE_UNDO_MOVE_CONTENT = new CmsResourceUndoMode(3);

        /** Indicates that the undo method will undo move operations and recursive content changes. */
        public static final CmsResourceUndoMode MODE_UNDO_MOVE_CONTENT_RECURSIVE = new CmsResourceUndoMode(4);

        /** Version id required for safe serialization. */
        private static final long serialVersionUID = 3521620626485212068L;

        /**
         * private constructor.<p>
         * 
         * @param mode the undo changes mode integer representation
         */
        private CmsResourceUndoMode(int mode) {

            super(mode);
        }

        /**
         * Returns the undo mode object from the old undo mode integer.<p>
         * 
         * @param mode the old undo mode integer
         * 
         * @return the undo mode object
         */
        public static CmsResourceUndoMode valueOf(int mode) {

            switch (mode) {
                case 1:
                    return CmsResourceUndoMode.MODE_UNDO_CONTENT;
                case 2:
                    return CmsResourceUndoMode.MODE_UNDO_CONTENT_RECURSIVE;
                case 3:
                    return CmsResourceUndoMode.MODE_UNDO_MOVE_CONTENT;
                case 4:
                default:
                    return CmsResourceUndoMode.MODE_UNDO_MOVE_CONTENT_RECURSIVE;
            }
        }

        /**
         * Returns a mode that includes the move operation with the same semantic as this mode.<p>
         * 
         * @return a mode that includes the move operation with the same semantic as this mode
         */
        public CmsResourceUndoMode includeMove() {

            if (!isUndoMove()) {
                // keep the same semantic but including move 
                return CmsResourceUndoMode.valueOf(getMode() + 2);
            }
            return this;
        }

        /**
         * Returns <code>true</code> if this undo operation is recursive.<p>
         * 
         * @return <code>true</code> if this undo operation is recursive
         */
        public boolean isRecursive() {

            return getMode() > CmsResource.UNDO_CONTENT.getMode();
        }

        /**
         * Returns <code>true</code> if this undo mode will undo move operations.<p>
         * 
         * @return <code>true</code> if this undo mode will undo move operations
         */
        public boolean isUndoMove() {

            return getMode() > CmsResource.UNDO_CONTENT_RECURSIVE.getMode();
        }

        /**
         * @see java.lang.Object#toString()
         */
        public String toString() {

            return String.valueOf(getMode());
        }
    }

    /**
     * A comparator for the release date of two resources.<p>
     * 
     * If the release date of a resource is not set, the
     * creation date is used instead.<p>
     */
    public static final Comparator COMPARE_DATE_RELEASED = new Comparator() {

        /**
         * @see java.util.Comparator#compare(java.lang.Object, java.lang.Object)
         */
        public int compare(Object o1, Object o2) {

            if ((o1 == o2) || !(o1 instanceof CmsResource) || !(o2 instanceof CmsResource)) {
                return 0;
            }

            CmsResource r1 = (CmsResource)o1;
            CmsResource r2 = (CmsResource)o2;

            long date1 = r1.getDateReleased();
            if (date1 == CmsResource.DATE_RELEASED_DEFAULT) {
                // use last modification date if release date is not set
                date1 = r1.getDateLastModified();
            }

            long date2 = r2.getDateReleased();
            if (date2 == CmsResource.DATE_RELEASED_DEFAULT) {
                // use last modification date if release date is not set
                date2 = r2.getDateLastModified();
            }

            return (date1 > date2) ? -1 : (date1 < date2) ? 1 : 0;
        }
    };

    /**
     * A comparator for the root path of two resources.<p>
     */
    public static final Comparator COMPARE_ROOT_PATH = new Comparator() {

        /**
         * @see java.util.Comparator#compare(java.lang.Object, java.lang.Object)
         */
        public int compare(Object o1, Object o2) {

            if ((o1 == o2) || !(o1 instanceof CmsResource) || !(o2 instanceof CmsResource)) {
                return 0;
            }

            CmsResource r1 = (CmsResource)o1;
            CmsResource r2 = (CmsResource)o2;

            return r1.getRootPath().compareTo(r2.getRootPath());
        }
    };

    /**
     * A comparator for the root path of two resources ignoring case differences.<p>
     */
    public static final Comparator COMPARE_ROOT_PATH_IGNORE_CASE = new Comparator() {

        /**
         * @see java.util.Comparator#compare(java.lang.Object, java.lang.Object)
         */
        public int compare(Object o1, Object o2) {