com.google.gwt.eclipse.core.runtime.GwtCapabilityChecker.java Source code

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Here is the source code for com.google.gwt.eclipse.core.runtime.GwtCapabilityChecker.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.gwt.eclipse.core.runtime;

import com.google.gdt.eclipse.core.sdk.Sdk.SdkException;
import com.google.gwt.eclipse.core.GWTPluginLog;

import java.net.MalformedURLException;
import java.net.URLClassLoader;

/**
 * Checks GWT SDKs for specific capabilities.
 */
public class GwtCapabilityChecker {

    /**
     * Creates new instances of the {@link GwtCapabilityChecker}.
     */
    public static class Factory {
        public GwtCapabilityChecker newGwtCapabilityChecker(GWTRuntime sdk) {
            return new GwtCapabilityChecker(sdk);
        }
    }

    /**
     * @return whether the fully-qualified class name exists in the GWT SDK
     */
    private static boolean doesGwtClassExist(GWTRuntime gwtRuntime, String qualifiedClassName) {
        try {
            URLClassLoader cl = gwtRuntime.createClassLoader();
            cl.loadClass(qualifiedClassName);
            return true;
        } catch (ClassNotFoundException e) {
            /*
             * No need for logging an exception here; we're just checking to see if
             * this runtime contains the given class or not.
             */
        } catch (MalformedURLException e) {
            GWTPluginLog.logError(e);
        } catch (SdkException e) {
            GWTPluginLog.logError(e);
        }

        return false;
    }

    private final GWTRuntime sdk;

    public GwtCapabilityChecker(GWTRuntime sdk) {
        this.sdk = sdk;
    }

    /**
     * @return true if the GWT compiler allows multiple modules to be passed in.
     */
    public boolean doesCompilerAllowMultipleModules() {
        // This new Compiler allows multiple modules to be passed in
        return doesGwtClassExist(sdk, "com.google.gwt.dev.Compiler");
    }
}