| /******************************************************************************* |
| * Copyright (c) 2006, 2007 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); |
| } |
| } |
| } |
| |