org.eclipse.wb.android.internal.editor.AndroidPairResourceProvider.java Source code

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Here is the source code for org.eclipse.wb.android.internal.editor.AndroidPairResourceProvider.java

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/*******************************************************************************
 * Copyright (c) 2011 Alexander Mitin (Alexander.Mitin@gmail.com)
 * 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:
 *    Alexander Mitin (Alexander.Mitin@gmail.com) - initial API and implementation
 *******************************************************************************/
package org.eclipse.wb.android.internal.editor;

import org.eclipse.wb.android.internal.support.AndroidUtils;
import org.eclipse.wb.internal.core.utils.execution.ExecutionUtils;
import org.eclipse.wb.internal.core.utils.execution.RunnableObjectEx;
import org.eclipse.wb.internal.core.utils.jdt.core.CodeUtils;
import org.eclipse.wb.internal.core.xml.editor.actions.IPairResourceProvider;

import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IProject;
import org.eclipse.jdt.core.IField;
import org.eclipse.jdt.core.IJavaElement;
import org.eclipse.jdt.core.IJavaProject;
import org.eclipse.jdt.core.IType;
import org.eclipse.jdt.core.JavaCore;

import org.apache.commons.lang.StringUtils;

import java.util.List;

/**
 * {@link IPairResourceProvider} for Android Designer.
 * 
 * @author mitin_aa
 * @coverage android.editor
 */
public final class AndroidPairResourceProvider implements IPairResourceProvider {
    ////////////////////////////////////////////////////////////////////////////
    //
    // Instance
    //
    ////////////////////////////////////////////////////////////////////////////
    public static final IPairResourceProvider INSTANCE = new AndroidPairResourceProvider();

    private AndroidPairResourceProvider() {
    }

    ////////////////////////////////////////////////////////////////////////////
    //
    // IPairResourceProvider
    //
    ////////////////////////////////////////////////////////////////////////////
    public IFile getPair(final IFile file) {
        return ExecutionUtils.runObjectIgnore(new RunnableObjectEx<IFile>() {
            public IFile runObject() throws Exception {
                if (file.getFileExtension().equalsIgnoreCase("xml")) {
                    return getJavaFile(file);
                }
                if (file.getFileExtension().equalsIgnoreCase("java")) {
                    return getLayoutFile(file);
                }
                return null;
            }
        }, null);
    }

    /**
     * @return the companion xml layout file used by this Activity.
     */
    protected IFile getLayoutFile(IFile file) {
        return null;
    }

    /**
     * @return the Activity file which uses given xml layout.
     */
    protected IFile getJavaFile(IFile layoutFile) throws Exception {
        IProject project = layoutFile.getProject();
        String packageName = AndroidUtils.getPackageFromManifest(project);
        if (packageName == null) {
            return null;
        }
        IJavaProject javaProject = JavaCore.create(project);
        IType rType = javaProject.findType(packageName, "R.layout");
        String layoutName = StringUtils.removeEnd(layoutFile.getName(), "." + layoutFile.getFileExtension());
        IField field = rType.getField(layoutName);
        List<IJavaElement> references = CodeUtils.searchReferences(field);
        for (IJavaElement element : references) {
            // TODO: ask the user if found more than one?
            return (IFile) element.getUnderlyingResource();
        }
        return null;
    }
}