/*
 *  RapidMiner
 *
 *  Copyright (C) 2001-2011 by Rapid-I and the contributors
 *
 *  Complete list of developers available at our web site:
 *
 *       http://rapid-i.com
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU Affero General Public License as published by
 *  the Free Software Foundation, either version 3 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 Affero General Public License for more details.
 *
 *  You should have received a copy of the GNU Affero General Public License
 *  along with this program.  If not, see http://www.gnu.org/licenses/.
 */
package com.rapidminer.repository;

import java.util.List;

import com.rapidminer.operator.ports.metadata.ExampleSetMetaData;
import com.rapidminer.repository.gui.actions.AbstractRepositoryAction;

/**
 * Declares a condition for {@link AbstractRepositoryAction}. If the conditions are met, the action is shown, otherwise it will not be shown.
 * This condition only evaluates to {@code true} if the selected entries are ExampleSets.
 *
 * @author Marco Boeck
 * 
 */
public class RepositoryActionConditionImplExampleSetsOnly implements RepositoryActionCondition {


	@Override
	public boolean evaluateCondition(List<Entry> entryList) {
		if (entryList == null) {
			return false;
		}
		
		for (Entry givenEntry : entryList) {
			
			// make sure each entry is an ExampleSet, if not condition evaluates to false
			if (givenEntry instanceof IOObjectEntry){
				IOObjectEntry entry = (IOObjectEntry)givenEntry;
				try {
					if (!(entry.retrieveMetaData() instanceof ExampleSetMetaData)) {
						return false;
					}
				} catch (RepositoryException e) {
					return false;
				}
				
			} else {
				return false;
			}
		}
		
		// all conditions have been met, so return true
		return true;
	}
	
}