source: trunk/gli/src/org/greenstone/gatherer/cdm/CollectionMeta.java@ 4932

/**
 *#########################################################################
 *
 * A component of the Gatherer application, part of the Greenstone digital
 * library suite from the New Zealand Digital Library Project at the
 * University of Waikato, New Zealand.
 *
 * Author: John Thompson, Greenstone Digital Library, University of Waikato
 *
 * Copyright (C) 1999 New Zealand Digital Library Project
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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 for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *########################################################################
 */
package org.greenstone.gatherer.cdm;
/**************************************************************************************
 * Written:     
 * Revised:     28/06/03 - DOM support
 **************************************************************************************/
import org.greenstone.gatherer.Configuration;
import org.greenstone.gatherer.Gatherer;
import org.greenstone.gatherer.cdm.CollectionConfiguration;
import org.greenstone.gatherer.cdm.CollectionDesignManager;
import org.greenstone.gatherer.cdm.DOMProxyListEntry;
import org.greenstone.gatherer.cdm.Index;
import org.greenstone.gatherer.msm.MSMUtils;
import org.greenstone.gatherer.util.StaticStrings;
import org.greenstone.gatherer.util.Utility;
import org.w3c.dom.*;
/** This class encapsulates a single collection level metadata assignment, which constitutes a name, language and value.
 * @author John Thompson, Greenstone Digital Library, University of Waikato
 * @version 2.4
 */
public class CollectionMeta
    implements DOMProxyListEntry {
    private Element element;
    private String text;

    /** Constructor.
     * @param element the Element from which we will determine metadata details
     */
    public CollectionMeta(Element element) {
    this.element = element;
    }

    /** Constructor to create a new piece of metadata given its name. */
    public CollectionMeta(String name) {
    element = CollectionDesignManager.collect_config.document.createElement(StaticStrings.COLLECTIONMETADATA_ELEMENT);
    element.setAttribute(StaticStrings.NAME_ATTRIBUTE, name);
    element.setAttribute(StaticStrings.LANGUAGE_ATTRIBUTE, Gatherer.config.interface_language);
    }

    /** Constructor to create a new piece of metadata given its name. */
    public CollectionMeta(String name, String language) {
    element = CollectionDesignManager.collect_config.document.createElement(StaticStrings.COLLECTIONMETADATA_ELEMENT);
    element.setAttribute(StaticStrings.NAME_ATTRIBUTE, name);
    element.setAttribute(StaticStrings.LANGUAGE_ATTRIBUTE, language);
    }

    /** Method to compare two collection metadata objects to calculate their respective ordering.
     * @param object the other metadata to compare to, as an Object
     * @return an int which is less than 0 if this object proceeds the given object, 0 if they are equal and greater than 0 otherwise.
     * @see org.greenstone.gatherer.cdm.Language
     */
    public int compareTo(Object object) {
    return toString().compareTo(object.toString());
    }

    /** Factory constructor. */
    public DOMProxyListEntry create(Element element) {
    return new CollectionMeta(element);
    }

    /** Method to compare two collection metadata objects for equality.
     * @param object The other metadata to compare to, as an <strong>Object</strong>.
     * @return A <i>boolean</i> value of <i>true</i> if the object are equal, <i>false</i> otherwise.
     */
    public boolean equals(Object object) {
    return (compareTo(object) == 0);
    }

    public Element getElement() {
    return element;
    }

    /** Method to retrieve the value of language.
     * @return The value of language as a <strong>String</strong>.
     */
    public String getLanguage() {
    // Retrieve the language string
    return element.getAttribute(StaticStrings.LANGUAGE_ATTRIBUTE);
    }

    /** Method to retrieve the value of name.
     * @return 
     */
    public String getName() {
    return element.getAttribute(StaticStrings.NAME_ATTRIBUTE);
    }
    /** Method to retrieve the value of value (well great choice of name there).
     * @return The value of value as a <strong>String</strong>.
     */
    public String getValue() {
    // We have to replace the string made of '\' 'n' with the '\n' character! Also watch for other greenstone magic
    return Utility.decodeGreenstone(MSMUtils.getValue(element));
    }

    public boolean isAssigned() {
    return (element != null && !element.getAttribute(CollectionConfiguration.ASSIGNED_ATTRIBUTE).equals(CollectionConfiguration.FALSE_STR));
    }

    /** Determine if this metadata is one of the four special pieces of metadata.
     * @return true if this metadata is special, false otherwise.
     */
    public boolean isSpecial() {
    return (element != null && element.getAttribute(StaticStrings.SPECIAL_ATTRIBUTE).equals(StaticStrings.TRUE_STR));
    }

    public void setAssigned(boolean assigned) {
    if(element != null) {
        element.setAttribute(CollectionConfiguration.ASSIGNED_ATTRIBUTE, (assigned ? CollectionConfiguration.TRUE_STR : CollectionConfiguration.FALSE_STR));
    }
    }

    public void setElement(Element element) {
    this.element = element;
    text = null;
    }

    /** Change the value of value. 
     * @param value the new value as a String.
     */
    public void setValue(String value) {
    MSMUtils.setValue(element, Utility.encodeGreenstone(value));
    text = null; // Reset text
    }

    /** Method to print out this class as it would appear within the collection configuration file.
      * @return A <strong>String</strong> containing the text value of this class.
      */
    public String toString() {
    if(text == null) {
        text = CollectionConfiguration.toString(element, true);
    }
    return text;
    }
}