com.google.gdt.eclipse.designer.gxt.actions.GxtPropertyTester.java Source code

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Here is the source code for com.google.gdt.eclipse.designer.gxt.actions.GxtPropertyTester.java

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/*******************************************************************************
 * Copyright 2011 Google Inc. All Rights Reserved.
 *
 * 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
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *******************************************************************************/
package com.google.gdt.eclipse.designer.gxt.actions;

import com.google.gdt.eclipse.designer.util.ModuleDescription;
import com.google.gdt.eclipse.designer.util.Utils;

import org.eclipse.wb.internal.core.utils.execution.ExecutionUtils;
import org.eclipse.wb.internal.core.utils.execution.RunnableObjectEx;

import org.eclipse.core.expressions.PropertyTester;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.runtime.IAdaptable;
import org.eclipse.jdt.core.IJavaElement;
import org.eclipse.jdt.core.IJavaProject;

import java.text.MessageFormat;

/**
 * {@link PropertyTester} for GXT specific properties.
 * 
 * @author scheglov_ke
 * @coverage ExtGWT.actions
 */
public class GxtPropertyTester extends PropertyTester {
    public static final String PROPERTY_IS_CONFIGURED = "isConfigured";

    ////////////////////////////////////////////////////////////////////////////
    //
    // IPropertyTester
    //
    ////////////////////////////////////////////////////////////////////////////
    public boolean test(final Object receiver, final String property, Object[] args, Object expectedValue) {
        return ExecutionUtils.runObjectLog(new RunnableObjectEx<Boolean>() {
            public Boolean runObject() throws Exception {
                return testEx(receiver, property);
            }
        }, false);
    }

    /**
     * Tests property, can throw {@link Exception}.
     */
    private static boolean testEx(Object receiver, String property) throws Exception {
        // prepare IJavaElement
        final IJavaElement element;
        if (receiver instanceof IAdaptable) {
            element = (IJavaElement) ((IAdaptable) receiver).getAdapter(IJavaElement.class);
        } else {
            element = null;
        }
        // Java tests
        {
            // prepare java element
            if (element == null || !element.exists()) {
                return false;
            }
            // do tests
            if (PROPERTY_IS_CONFIGURED.equals(property)) {
                IJavaProject javaProject = element.getJavaProject();
                boolean hasJar = javaProject.findType("com.extjs.gxt.ui.client.widget.Component") != null;
                if (hasJar) {
                    IJavaElement pkg = element.getAncestor(IJavaElement.PACKAGE_FRAGMENT);
                    if (pkg != null) {
                        IResource resource = pkg.getUnderlyingResource();
                        ModuleDescription module = Utils.getSingleModule(resource);
                        return module != null && Utils.inheritsModule(module, "com.extjs.gxt.ui.GXT");
                    }
                }
                return false;
            }
        }
        // unknown property
        throw new IllegalArgumentException(
                MessageFormat.format("Illegal property '{0}' for '{1}'.", property, receiver));
    }
}