/******************************************************************************* * Copyright (c) 2006 IBM Corporation and others. * 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 * * Contributors: *     IBM Corporation - initial API and implementation *******************************************************************************/package org.eclipse.ui.internal.expressions;import java.util.ArrayList;import java.util.Iterator;import java.util.List;import org.eclipse.core.expressions.EvaluationResult;import org.eclipse.core.expressions.Expression;import org.eclipse.core.expressions.ExpressionInfo;import org.eclipse.core.expressions.IEvaluationContext;import org.eclipse.core.runtime.CoreException;/** * Copied from org.eclipse.core.internal.expressions. */public abstract class CompositeExpression extends Expression {	private static final Expression[] EMPTY_ARRAY = new Expression[0];	protected List fExpressions;	public void add(Expression expression) {		if (fExpressions == null) {			fExpressions = new ArrayList(2);		}		fExpressions.add(expression);	}	public Expression[] getChildren() {		if (fExpressions == null) {			return EMPTY_ARRAY;		}		return (Expression[]) fExpressions.toArray(new Expression[fExpressions				.size()]);	}	protected EvaluationResult evaluateAnd(IEvaluationContext scope)			throws CoreException {		if (fExpressions == null) {			return EvaluationResult.TRUE;		}		EvaluationResult result = EvaluationResult.TRUE;		for (Iterator iter = fExpressions.iterator(); iter.hasNext();) {			Expression expression = (Expression) iter.next();			result = result.and(expression.evaluate(scope));			// keep iterating even if we have a not loaded found. It can be			// that we find a false which will result in a better result.			if (result == EvaluationResult.FALSE) {				return result;			}		}		return result;	}	protected EvaluationResult evaluateOr(IEvaluationContext scope)			throws CoreException {		if (fExpressions == null) {			return EvaluationResult.TRUE;		}		EvaluationResult result = EvaluationResult.FALSE;		for (Iterator iter = fExpressions.iterator(); iter.hasNext();) {			Expression expression = (Expression) iter.next();			result = result.or(expression.evaluate(scope));			if (result == EvaluationResult.TRUE) {				return result;			}		}		return result;	}	public void collectExpressionInfo(ExpressionInfo info) {		if (fExpressions == null) {			return;		}		for (Iterator iter = fExpressions.iterator(); iter.hasNext();) {			Expression expression = (Expression) iter.next();			expression.collectExpressionInfo(info);		}	}}