| /******************************************************************************* |
| * 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 InstanceofExpression extends Expression { |
| /** |
| * The seed for the hash code for all instance of expressions. |
| */ |
| private static final int HASH_INITIAL= InstanceofExpression.class.getName().hashCode(); |
| |
| private String fTypeName; |
| |
| public InstanceofExpression(IConfigurationElement element) throws CoreException { |
| fTypeName= element.getAttribute(ATT_VALUE); |
| Expressions.checkAttribute(ATT_VALUE, fTypeName); |
| } |
| |
| public InstanceofExpression(Element element) throws CoreException { |
| fTypeName= element.getAttribute(ATT_VALUE); |
| Expressions.checkAttribute(ATT_VALUE, fTypeName.length() > 0 ? fTypeName : null); |
| } |
| |
| public InstanceofExpression(String typeName) { |
| Assert.isNotNull(typeName); |
| fTypeName= typeName; |
| } |
| |
| /* (non-Javadoc) |
| * @see org.eclipse.jdt.internal.corext.refactoring.participants.Expression#evaluate(java.lang.Object) |
| */ |
| public EvaluationResult evaluate(IEvaluationContext context) { |
| Object element= context.getDefaultVariable(); |
| return EvaluationResult.valueOf(Expressions.isInstanceOf(element, fTypeName)); |
| } |
| |
| public void collectExpressionInfo(ExpressionInfo info) { |
| info.markDefaultVariableAccessed(); |
| } |
| |
| public boolean equals(final Object object) { |
| if (!(object instanceof InstanceofExpression)) |
| return false; |
| |
| final InstanceofExpression that= (InstanceofExpression) object; |
| return this.fTypeName.equals(that.fTypeName); |
| } |
| |
| protected int computeHashCode() { |
| return HASH_INITIAL * HASH_FACTOR + fTypeName.hashCode(); |
| } |
| |
| //---- Debugging --------------------------------------------------- |
| |
| /* (non-Javadoc) |
| * @see java.lang.Object#toString() |
| */ |
| public String toString() { |
| return "<instanceof value=\"" + fTypeName + "\"/>"; //$NON-NLS-1$ //$NON-NLS-2$ |
| } |
| } |