io.sarl.eclipse.wizards.elements.FieldInitializerUtil.java Source code

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Here is the source code for io.sarl.eclipse.wizards.elements.FieldInitializerUtil.java

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/*
 * $Id$
 *
 * SARL is an general-purpose agent programming language.
 * More details on http://www.sarl.io
 *
 * Copyright (C) 2014-2017 the original authors or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * 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 io.sarl.eclipse.wizards.elements;

import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.core.runtime.IAdaptable;
import org.eclipse.jdt.core.IJavaElement;
import org.eclipse.jdt.core.IJavaProject;
import org.eclipse.jdt.core.JavaCore;
import org.eclipse.jdt.core.JavaModelException;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.ui.IWorkbenchPage;
import org.eclipse.ui.IWorkbenchPart;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.views.contentoutline.ContentOutline;
import org.eclipse.xtext.ui.editor.XtextEditor;
import org.eclipse.xtext.ui.editor.model.IXtextDocument;

/** Utilities for field initialization in the wizards.
 *
 * <p>This class is copied from the Xtend library.
 *
 * @author $Author: sgalland$
 * @version $FullVersion$
 * @mavengroupid $GroupId$
 * @mavenartifactid $ArtifactId$
 */
public class FieldInitializerUtil {

    /** Replies the Java element that corresponds to the given selection.
     *
     * @param selection - the current selection.
     * @return the Java element.
     */
    @SuppressWarnings("static-method")
    public IJavaElement getSelectedResource(IStructuredSelection selection) {
        IJavaElement elem = null;
        if (selection != null && !selection.isEmpty()) {
            final Object object = selection.getFirstElement();
            if (object instanceof IAdaptable) {
                final IAdaptable adaptable = (IAdaptable) object;
                elem = adaptable.getAdapter(IJavaElement.class);
                if (elem == null) {
                    elem = getPackage(adaptable);
                }
            }
        }
        if (elem == null) {
            final IWorkbenchPage activePage = PlatformUI.getWorkbench().getActiveWorkbenchWindow().getActivePage();
            IWorkbenchPart part = activePage.getActivePart();
            if (part instanceof ContentOutline) {
                part = activePage.getActiveEditor();
            }
            if (part instanceof XtextEditor) {
                final IXtextDocument doc = ((XtextEditor) part).getDocument();
                final IFile file = doc.getAdapter(IFile.class);
                elem = getPackage(file);
            }
        }
        if (elem == null || elem.getElementType() == IJavaElement.JAVA_MODEL) {
            try {
                final IJavaProject[] projects = JavaCore.create(ResourcesPlugin.getWorkspace().getRoot())
                        .getJavaProjects();
                if (projects.length == 1) {
                    elem = projects[0];
                }
            } catch (JavaModelException e) {
                throw new RuntimeException(e.getMessage());
            }
        }
        return elem;
    }

    private static IJavaElement getPackage(IAdaptable adaptable) {
        IJavaElement elem = null;
        IResource resource = adaptable.getAdapter(IResource.class);
        if (resource != null && resource.getType() != IResource.ROOT) {
            while (elem == null && resource.getType() != IResource.PROJECT) {
                resource = resource.getParent();
                elem = resource.getAdapter(IJavaElement.class);
            }
        }
        if (elem == null) {
            elem = JavaCore.create(resource);
        }
        return elem;
    }

}