| package org.eclipse.ui.internal; |
| |
| /* |
| * Copyright (c) 2002 IBM Corp. All rights reserved. |
| * This file is made available under the terms of the Common Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/cpl-v10.html |
| */ |
| |
| import java.util.*; |
| |
| import org.eclipse.core.resources.IResource; |
| import org.eclipse.core.runtime.*; |
| import org.eclipse.ui.IActionFilter; |
| |
| /** |
| * An ObjectFilterTest is used to read an object filter from XML, |
| * and evaluate the results for a given object. |
| */ |
| public class ObjectFilterTest { |
| private HashMap filterElements; |
| |
| /** |
| * Create a new object filter. |
| */ |
| public ObjectFilterTest() { |
| } |
| |
| /** |
| * Add a filter element to the test. This element must contain |
| * a name value filter pair, as defined by the |
| * <code>org.eclipse.ui.actionFilters</code> extension point. |
| */ |
| public boolean addFilterElement(IConfigurationElement element) { |
| String name = element.getAttribute("name");//$NON-NLS-1$ |
| if (name == null) |
| return false; |
| |
| // Get positive property. |
| String value = element.getAttribute("value");//$NON-NLS-1$ |
| if (value == null) |
| return false; |
| if (filterElements==null) |
| filterElements = new HashMap(); |
| filterElements.put(name, value); |
| return true; |
| } |
| |
| /** |
| * Returns whether the object filter correctly matches a |
| * given object. The results will be <code>true</code> if there is |
| * a filter match. |
| * <p> |
| * If <code>adaptable is true</code>, the result will also be |
| * <code>rue</code> if the object is a wrapper for a resource, and |
| * the resource produces a filter match. |
| * </p> |
| * |
| * @param object the object to examine |
| * @returns <code>true</code> if there is a filter match. |
| */ |
| public boolean matches(Object object, boolean adaptable) { |
| // Optimize it. |
| if (filterElements == null) |
| return true; |
| |
| // Try out the object. |
| if (this.preciselyMatches(object)) |
| return true; |
| |
| // If not adaptable, or the object is a resource, just return. |
| if (!adaptable) |
| return false; |
| if (object instanceof IResource) |
| return false; |
| |
| // Try out the underlying resource. |
| IResource res = null; |
| if (object instanceof IAdaptable) |
| res = (IResource)((IAdaptable)object).getAdapter(IResource.class); |
| if (res == null) |
| return false; |
| return this.preciselyMatches(res); |
| } |
| |
| /** |
| * Returns whether the object filter correctly matches a given object. |
| */ |
| private boolean preciselyMatches(Object object) { |
| // Get the action filter. |
| IActionFilter filter = null; |
| if (object instanceof IActionFilter) |
| filter = (IActionFilter)object; |
| else if (object instanceof IAdaptable) |
| filter = (IActionFilter)((IAdaptable)object).getAdapter(IActionFilter.class); |
| if (filter == null) |
| return false; |
| |
| // Run the action filter. |
| Iterator iter = filterElements.keySet().iterator(); |
| while (iter.hasNext()) { |
| String name = (String)iter.next(); |
| String value = (String)filterElements.get(name); |
| if (!filter.testAttribute(object, name, value)) |
| return false; |
| } |
| return true; |
| } |
| } |
| |
| |