| /******************************************************************************* |
| * Copyright (c) 2000, 2004 International Business Machines Corp. and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Common Public License v0.5 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/cpl-v05.html |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| ******************************************************************************/ |
| package org.eclipse.core.expressions; |
| |
| import org.eclipse.core.runtime.CoreException; |
| |
| /** |
| * A property tester can be used to add additional properties to test to an |
| * existing type. |
| * <p> |
| * This interface is not intended to be implemented by clients. Clients |
| * should subclass type <code>PropertyTester</code>. |
| * </p> |
| * |
| * @since 3.0 |
| */ |
| public interface IPropertyTester { |
| |
| /** |
| * Returns whether the property tester can handle the given |
| * property or not. |
| * |
| * @param namespace the name space to be considered |
| * @param property the property to test |
| * @return <code>true</code> if the tester provides an implementation |
| * for the given property; otherwise <code>false</code> is returned |
| */ |
| public boolean handles(String namespace, String property); |
| |
| /** |
| * Returns whether the implementation class for this property tester is |
| * loaded or not. |
| * |
| * @return <code>true</code>if the implementation class is loaded; |
| * <code>false</code> otherwise |
| */ |
| public boolean isLoaded(); |
| |
| /** |
| * Returns <code>true</code> if the implementation class of this property |
| * tester can be loaded. This is the case if the plug-in providing |
| * the implementation class is loaded. Returns <code>false</code> otherwise. |
| * |
| * @return whether the implementation class can be loaded or not |
| */ |
| public boolean canLoad(); |
| |
| /** |
| * Loads the implementation class for this property tester and returns an |
| * instance of this class. |
| * |
| * @return an instance of the implementation class for this property tester |
| * |
| * @throws CoreException if the implementation class cannot be loaded |
| */ |
| public IPropertyTester load() throws CoreException; |
| |
| /** |
| * Executes the property test determined by the parameter <code>property</code>. |
| * |
| * @param receiver the receiver of the property test |
| * @param property the property to test |
| * @param args additional arguments to resolve the property. If no arguments |
| * are specified in the <code>test</code> expression an array of length 0 |
| * is passed |
| * @param expectedValue the expected value of the property. The value is either |
| * of type <code>java.lang.String</code> or a boxed base type. If no value was |
| * specified in the <code>test</code> expressions then <code>null</code> is passed |
| * |
| * @return returns <code>true<code> if the property is equal to the expected value; |
| * otherwise <code>false</code> is returned |
| */ |
| public boolean test(Object receiver, String property, Object[] args, Object expectedValue); |
| } |