CompoundFilter.java

/**
 * This file is protected by Copyright.
 * Please refer to the COPYRIGHT file distributed with this source distribution.
 *
 * This file is part of REDHAWK IDE.
 *
 * All rights reserved.  This program and the accompanying materials are made available under
 * the terms of the Eclipse Public License v1.0 which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html.
 */
package gov.redhawk.core.graphiti.ui.properties;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import org.eclipse.jface.viewers.IFilter;

/**
 * A filter that combines the output of several filters with <b>AND</b> or <b>OR</b> operations.
 */
public class CompoundFilter implements IFilter {

	public enum BooleanOperator {
		FILTER_AND,
		FILTER_OR
	};

	private List<IFilter> subFilters;
	private BooleanOperator myOperator;

	public CompoundFilter(BooleanOperator op) {
		this.subFilters = new ArrayList<IFilter>();
		this.myOperator = op;
	}

	@Override
	public boolean select(Object toTest) {
		switch (this.myOperator) {
		case FILTER_AND:
			for (IFilter filter : this.subFilters) {
				if (!filter.select(toTest)) {
					return false;
				}
			}
			return true;
		case FILTER_OR:
			for (IFilter filter : this.subFilters) {
				if (filter.select(toTest)) {
					return true;
				}
			}
			return false;
		default:
			return false;
		}
	}

	public void addFilter(IFilter filter) {
		this.subFilters.add(filter);
	}

	public void clearFilters() {
		this.subFilters.clear();
	}

	@Override
	public String toString() {
		StringBuilder sb = new StringBuilder("CompoundFilter ( ");
		Iterator<IFilter> iter = this.subFilters.iterator();
		while (iter.hasNext()) {
			sb.append(iter.next());
			if (iter.hasNext()) {
				if (this.myOperator == BooleanOperator.FILTER_AND) {
					sb.append(" AND ");
				} else {
					sb.append(" OR ");
				}
			}
		}
		sb.append(" )");
		return sb.toString();
	}

}