org.eclipse.jpt.jpa.ui.internal.handlers.AbstractJavaMetadataConversionHandler.java Source code

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Here is the source code for org.eclipse.jpt.jpa.ui.internal.handlers.AbstractJavaMetadataConversionHandler.java

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/*******************************************************************************
 * Copyright (c) 2011, 2013 Oracle. 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.
 *
 * Contributors:
 *     Oracle - initial API and implementation
 ******************************************************************************/
package org.eclipse.jpt.jpa.ui.internal.handlers;

import org.eclipse.core.commands.AbstractHandler;
import org.eclipse.core.commands.ExecutionEvent;
import org.eclipse.core.commands.ExecutionException;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.IResource;
import org.eclipse.jdt.core.IJavaElement;
import org.eclipse.jdt.core.IJavaProject;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jpt.common.core.internal.utility.PlatformTools;
import org.eclipse.jpt.jpa.core.JpaProject;
import org.eclipse.jpt.jpa.ui.JpaPlatformUi;
import org.eclipse.ui.handlers.HandlerUtil;

public abstract class AbstractJavaMetadataConversionHandler extends AbstractHandler {
    public AbstractJavaMetadataConversionHandler() {
        super();
    }

    public Object execute(ExecutionEvent event) throws ExecutionException {
        this.execute_(event);
        return null;
    }

    protected void execute_(ExecutionEvent event) throws ExecutionException {
        IStructuredSelection selection = (IStructuredSelection) HandlerUtil.getCurrentSelectionChecked(event);
        JpaProject jpaProject = this.convertSelectionToJpaProject(selection.getFirstElement());
        if (jpaProject != null) {
            JpaPlatformUi ui = this.getJpaPlatformUi(jpaProject);
            if (ui != null) {
                this.convertJavaMetadata(ui, jpaProject);
            }
        }
    }

    protected abstract void convertJavaMetadata(JpaPlatformUi ui, JpaProject jpaProject);

    protected JpaProject convertSelectionToJpaProject(Object sel) {
        try {
            return (sel == null) ? null : this.convertSelectionToJpaProject_(sel);
        } catch (InterruptedException ex) {
            Thread.currentThread().interrupt();
            return null;
        }
    }

    protected JpaProject convertSelectionToJpaProject_(Object sel) throws InterruptedException {
        // this will handle JpaProject and IProject (when the JpaProject is already present)
        JpaProject jpaProject = PlatformTools.getAdapter(sel, JpaProject.class);
        if (jpaProject != null) {
            return jpaProject;
        }
        IProject project = this.convertSelectionToProject(sel);
        if (project == null) {
            return null;
        }
        JpaProject.Reference ref = (JpaProject.Reference) project.getAdapter(JpaProject.Reference.class);
        // this will wait for the JpaProject if it is under construction
        return (ref == null) ? null : ref.getValue();
    }

    protected IProject convertSelectionToProject(Object sel) {
        // this will handle JpaProject and IProject
        IResource resource = PlatformTools.getAdapter(sel, IResource.class);
        if (resource != null) {
            return resource.getProject();
        }

        IJavaProject javaProject = this.convertSelectionToJavaProject(sel);
        return (javaProject == null) ? null : javaProject.getProject();
    }

    protected IJavaProject convertSelectionToJavaProject(Object sel) {
        IJavaElement javaElement = PlatformTools.getAdapter(sel, IJavaElement.class);
        return (javaElement == null) ? null : javaElement.getJavaProject();
    }

    private JpaPlatformUi getJpaPlatformUi(JpaProject jpaProject) {
        return (JpaPlatformUi) jpaProject.getJpaPlatform().getAdapter(JpaPlatformUi.class);
    }
}