IEvaluationService


1   /*******************************************************************************
2    * Copyright (c) 2007 IBM Corporation and others.
3    * All rights reserved. This program and the accompanying materials
4    * are made available under the terms of the Eclipse Public License v1.0
5    * which accompanies this distribution, and is available at
6    * http://www.eclipse.org/legal/epl-v10.html
7    *
8    * Contributors:
9    *     IBM Corporation - initial API and implementation
10   ******************************************************************************/
11  
12  package org.eclipse.ui.internal.services;
13  
14  import org.eclipse.core.expressions.Expression;
15  import org.eclipse.core.expressions.IEvaluationContext;
16  import org.eclipse.jface.util.IPropertyChangeListener;
17  import org.eclipse.ui.services.IServiceWithSources;
18  
19  /**
20   * This should be more a more generic way to have your core expressions
21   * evaluated. This is internal in 3.3, and highly experimental.
22   * 
23   * @since 3.3
24   */
25  public interface IEvaluationService extends IServiceWithSources {
26      public static final String   RESULT = "org.eclipse.ui.services.result"; //$NON-NLS-1$
27      public static final String   PROP_NOTIFYING = "org.eclipse.ui.services.notifying"; //$NON-NLS-1$
28  
29  
30      public void addServiceListener(IPropertyChangeListener listener);
31  
32      public void removeServiceListener(IPropertyChangeListener listener);
33  
34      public IEvaluationReference addEvaluationListener(Expression expression,
35              IPropertyChangeListener listener, String   property, Expression restrictEvaluation);
36  
37      public void removeEvaluationListener(IEvaluationReference ref);
38  
39      public IEvaluationContext getCurrentState();
40  }
41

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