core/plugins/org.eclipse.dltk.ui/core refactoring/org/eclipse/dltk/internal/corext/refactoring/participants/ResourceExtender.java

/*******************************************************************************
 * Copyright (c) 2000, 2017 IBM Corporation and others.
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0 which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 * 
 * SPDX-License-Identifier: EPL-2.0
 *
 *******************************************************************************/
package org.eclipse.dltk.internal.corext.refactoring.participants;

import org.eclipse.core.expressions.PropertyTester;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.runtime.Assert;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.dltk.internal.ui.util.StringMatcher;

public class ResourceExtender extends PropertyTester {

	private static final String PROPERTY_MATCHES_PATTERN= "matchesPattern";	 //$NON-NLS-1$
	private static final String PROJECT_NATURE = "projectNature";	 //$NON-NLS-1$
	private static final String CAN_DELETE= "canDelete"; //$NON-NLS-1$

	@Override
	public boolean test(Object receiver, String method, Object[] args, Object expectedValue) {
		IResource resource= (IResource)receiver;
		if (PROPERTY_MATCHES_PATTERN.equals(method)) {
			String fileName= resource.getName();
			StringMatcher matcher= new StringMatcher((String)expectedValue, false, false);
			return matcher.match(fileName);
		} else if (PROJECT_NATURE.equals(method)) {
			try {
				IProject proj = resource.getProject();
				return proj.isAccessible() && proj.hasNature((String)expectedValue);
			} catch (CoreException e) {
				return false;
			}
		} else if (CAN_DELETE.equals(method)) {
			return canDelete(resource);
		}
		Assert.isTrue(false);
		return false;
	}

	private boolean canDelete(IResource resource) {
		if (!resource.exists() || resource.isPhantom())
			return false;
		if (resource.getType() == IResource.ROOT || resource.getType() == IResource.PROJECT)
			return false;
		return true;
	}
}