/* 
 * Copyright (c) 2008 Stiftung Deutsches Elektronen-Synchrotron, 
 * Member of the Helmholtz Association, (DESY), HAMBURG, GERMANY.
 *
 * THIS SOFTWARE IS PROVIDED UNDER THIS LICENSE ON AN "../AS IS" BASIS. 
 * WITHOUT WARRANTY OF ANY KIND, EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED 
 * TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR PARTICULAR PURPOSE AND 
 * NON-INFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE 
 * FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, 
 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR 
 * THE USE OR OTHER DEALINGS IN THE SOFTWARE. SHOULD THE SOFTWARE PROVE DEFECTIVE 
 * IN ANY RESPECT, THE USER ASSUMES THE COST OF ANY NECESSARY SERVICING, REPAIR OR 
 * CORRECTION. THIS DISCLAIMER OF WARRANTY CONSTITUTES AN ESSENTIAL PART OF THIS LICENSE. 
 * NO USE OF ANY SOFTWARE IS AUTHORIZED HEREUNDER EXCEPT UNDER THIS DISCLAIMER.
 * DESY HAS NO OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, 
 * OR MODIFICATIONS.
 * THE FULL LICENSE SPECIFYING FOR THE SOFTWARE THE REDISTRIBUTION, MODIFICATION, 
 * USAGE AND OTHER RIGHTS AND OBLIGATIONS IS INCLUDED WITH THE DISTRIBUTION OF THIS 
 * PROJECT IN THE FILE LICENSE.HTML. IF THE LICENSE IS NOT INCLUDED YOU MAY FIND A COPY 
 * AT HTTP://WWW.DESY.DE/LEGAL/LICENSE.HTM
 */
 package org.csstudio.sds.ui.internal.properties.propertydescriptors;

import java.util.Iterator;
import java.util.Map;

import org.csstudio.sds.model.PropertyTypesEnum;
import org.csstudio.sds.ui.internal.properties.StringMapCellEditor;
import org.csstudio.sds.ui.properties.PropertyDescriptor;
import org.eclipse.jface.viewers.CellEditor;
import org.eclipse.jface.viewers.LabelProvider;
import org.eclipse.swt.widgets.Composite;

/**
 * Descriptor for a property that has a value which should be edited with a map
 * cell editor.
 * <p>
 * This class may be instantiated; it is not intended to be subclassed.
 * </p>
 * <p>
 * Example:
 * 
 * <pre>
 * IPropertyDescriptor pd = new MapPropertyDescriptor("surname", "Last Name");
 * </pre>
 * 
 * </p>
 * 
 * @author Kai Meyer
 */
public class StringMapPropertyDescriptor extends PropertyDescriptor {
	
	/**
	 * The name of the property.
	 */
	private final String _name;
	/**
	 * Creates an property descriptor with the given id and display name.
	 * 
	 * @param id
	 *            the id of the property
	 * @param displayName
	 *            the name to display for the property
	 * @param category
	 *            the category
	 */
	public StringMapPropertyDescriptor(final Object id, final String displayName, PropertyTypesEnum type,
			final String category) {
		super(id, displayName, type);
		_name = displayName;
		assert category != null;
		setCategory(category);
		
		this.setLabelProvider(new MapLabelProvider());
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	public CellEditor createPropertyEditor(final Composite parent) {
		CellEditor editor = new StringMapCellEditor(parent, _name);
		if (getValidator() != null) {
			editor.setValidator(getValidator());
		}
		return editor;
	}
	
	/**
	 * A label provider for a Map of Strings.
	 * 
	 * @author Kai Meyer
	 */
	private final class MapLabelProvider extends LabelProvider {
		/**
		 * {@inheritDoc}
		 */
		@SuppressWarnings("unchecked")
		@Override
		public String getText(final Object element) {
			if (element instanceof Map) {
				Map<String, String> map = (Map<String, String>) element;
				StringBuffer buffer = new StringBuffer("[");
				if (!map.isEmpty()) {
					Iterator<String> it = map.keySet().iterator();
					
					while(it.hasNext()) {
						String key = it.next();
						String val = map.get(key);
						
						buffer.append(key);
						buffer.append(":");
						buffer.append(val);
						buffer.append(it.hasNext()?", ":"");
					}
				}
				buffer.append("]");
				return buffer.toString();
			} else {
				return element.toString();
			}
		}
		
	}
}