| /******************************************************************************* |
| * Copyright (c) 2000, 2008 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.core.internal.expressions; |
| |
| import org.w3c.dom.Element; |
| |
| 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.Assert; |
| import org.eclipse.core.runtime.CoreException; |
| import org.eclipse.core.runtime.IConfigurationElement; |
| |
| public class EqualsExpression extends Expression { |
| /** |
| * The seed for the hash code for all equals expressions. |
| */ |
| private static final int HASH_INITIAL= EqualsExpression.class.getName().hashCode(); |
| |
| private Object fExpectedValue; |
| |
| public EqualsExpression(Object expectedValue) { |
| Assert.isNotNull(expectedValue); |
| fExpectedValue= expectedValue; |
| } |
| |
| public EqualsExpression(IConfigurationElement element) throws CoreException { |
| String value= element.getAttribute(ATT_VALUE); |
| Expressions.checkAttribute(ATT_VALUE, value); |
| fExpectedValue= Expressions.convertArgument(value); |
| } |
| |
| public EqualsExpression(Element element) throws CoreException { |
| String value= element.getAttribute(ATT_VALUE); |
| Expressions.checkAttribute(ATT_VALUE, value.length() > 0 ? value : null); |
| fExpectedValue= Expressions.convertArgument(value); |
| } |
| |
| public EvaluationResult evaluate(IEvaluationContext context) throws CoreException { |
| Object element= context.getDefaultVariable(); |
| return EvaluationResult.valueOf(element.equals(fExpectedValue)); |
| } |
| |
| public void collectExpressionInfo(ExpressionInfo info) { |
| info.markDefaultVariableAccessed(); |
| } |
| |
| public boolean equals(final Object object) { |
| if (!(object instanceof EqualsExpression)) |
| return false; |
| |
| final EqualsExpression that= (EqualsExpression)object; |
| return this.fExpectedValue.equals(that.fExpectedValue); |
| } |
| |
| protected int computeHashCode() { |
| return HASH_INITIAL * HASH_FACTOR + fExpectedValue.hashCode(); |
| } |
| } |