| /******************************************************************************* |
| * 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.runtime.Assert; |
| import org.eclipse.core.runtime.CoreException; |
| import org.eclipse.core.runtime.IConfigurationElement; |
| |
| import org.eclipse.core.expressions.EvaluationContext; |
| import org.eclipse.core.expressions.EvaluationResult; |
| import org.eclipse.core.expressions.ExpressionInfo; |
| import org.eclipse.core.expressions.IEvaluationContext; |
| |
| public class WithExpression extends CompositeExpression { |
| |
| private String fVariable; |
| private static final String ATT_VARIABLE= "variable"; //$NON-NLS-1$ |
| |
| /** |
| * The seed for the hash code for all with expressions. |
| */ |
| private static final int HASH_INITIAL= WithExpression.class.getName().hashCode(); |
| |
| public WithExpression(IConfigurationElement configElement) throws CoreException { |
| fVariable= configElement.getAttribute(ATT_VARIABLE); |
| Expressions.checkAttribute(ATT_VARIABLE, fVariable); |
| } |
| |
| public WithExpression(Element element) throws CoreException { |
| fVariable= element.getAttribute(ATT_VARIABLE); |
| Expressions.checkAttribute(ATT_VARIABLE, fVariable.length() > 0 ? fVariable : null); |
| } |
| |
| public WithExpression(String variable) { |
| Assert.isNotNull(variable); |
| fVariable= variable; |
| } |
| |
| public boolean equals(final Object object) { |
| if (!(object instanceof WithExpression)) |
| return false; |
| |
| final WithExpression that= (WithExpression)object; |
| return this.fVariable.equals(that.fVariable) && equals(this.fExpressions, that.fExpressions); |
| } |
| |
| protected int computeHashCode() { |
| return HASH_INITIAL * HASH_FACTOR + hashCode(fExpressions) |
| * HASH_FACTOR + fVariable.hashCode(); |
| } |
| |
| public EvaluationResult evaluate(IEvaluationContext context) throws CoreException { |
| Object variable= context.getVariable(fVariable); |
| if (variable == null) { |
| throw new CoreException(new ExpressionStatus( |
| ExpressionStatus.VARIABLE_NOT_DEFINED, |
| Messages.format(ExpressionMessages.WithExpression_variable_not_defined, fVariable))); |
| } |
| if (variable == IEvaluationContext.UNDEFINED_VARIABLE) { |
| return EvaluationResult.FALSE; |
| } |
| return evaluateAnd(new EvaluationContext(context, variable)); |
| } |
| |
| public void collectExpressionInfo(ExpressionInfo info) { |
| ExpressionInfo other= new ExpressionInfo(); |
| super.collectExpressionInfo(other); |
| if (other.hasDefaultVariableAccess()) { |
| info.addVariableNameAccess(fVariable); |
| } |
| info.mergeExceptDefaultVariable(other); |
| } |
| } |