com.google.gdt.eclipse.designer.uibinder.editor.UiBinderPairResourceProvider.java Source code

Introduction

Here is the source code for com.google.gdt.eclipse.designer.uibinder.editor.UiBinderPairResourceProvider.java

Source

/*******************************************************************************
 * 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.uibinder.editor;

import org.eclipse.wb.internal.core.utils.execution.ExecutionUtils;
import org.eclipse.wb.internal.core.utils.execution.RunnableObjectEx;
import org.eclipse.wb.internal.core.xml.editor.actions.IPairResourceProvider;

import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IFolder;
import org.eclipse.core.resources.IProject;
import org.eclipse.jdt.core.IJavaProject;
import org.eclipse.jdt.core.IPackageFragment;
import org.eclipse.jdt.core.IPackageFragmentRoot;
import org.eclipse.jdt.core.IType;
import org.eclipse.jdt.core.JavaCore;

import org.apache.commons.lang.StringUtils;

/**
 * {@link IPairResourceProvider} for GWT UiBinder.
 * 
 * @author scheglov_ke
 * @coverage GWT.UiBinder.editor
 */
public final class UiBinderPairResourceProvider implements IPairResourceProvider {
    ////////////////////////////////////////////////////////////////////////////
    //
    // Instance
    //
    ////////////////////////////////////////////////////////////////////////////
    public static final IPairResourceProvider INSTANCE = new UiBinderPairResourceProvider();

    private UiBinderPairResourceProvider() {
    }

    ////////////////////////////////////////////////////////////////////////////
    //
    // IPairResourceProvider
    //
    ////////////////////////////////////////////////////////////////////////////
    public IFile getPair(final IFile file) {
        return ExecutionUtils.runObjectIgnore(new RunnableObjectEx<IFile>() {
            public IFile runObject() throws Exception {
                String fileName = file.getName();
                if (StringUtils.endsWithIgnoreCase(fileName, ".ui.xml")) {
                    return getJavaFile(file);
                }
                if (StringUtils.endsWithIgnoreCase(fileName, ".java")) {
                    return getUIFile(file);
                }
                return null;
            }
        }, null);
    }

    ////////////////////////////////////////////////////////////////////////////
    //
    // ui.xml -> Java
    //
    ////////////////////////////////////////////////////////////////////////////
    /**
     * @return the Java {@link IFile} for given ui.xml one.
     */
    private IFile getJavaFile(IFile uiFile) throws Exception {
        IProject project = uiFile.getProject();
        IJavaProject javaProject = JavaCore.create(project);
        // try to find Java file in same package
        {
            IFolder folder = (IFolder) uiFile.getParent();
            IPackageFragment packageFragment = (IPackageFragment) JavaCore.create(folder);
            // find IType
            String formName = StringUtils.removeEndIgnoreCase(uiFile.getName(), ".ui.xml");
            String typeName = packageFragment.getElementName() + "." + formName;
            IType type = javaProject.findType(typeName);
            if (type != null) {
                return (IFile) type.getCompilationUnit().getUnderlyingResource();
            }
        }
        // no Java file
        return null;
    }

    ////////////////////////////////////////////////////////////////////////////
    //
    // Java -> ui.xml
    //
    ////////////////////////////////////////////////////////////////////////////
    /**
     * @return the ui.xml {@link IFile} for given Java one.
     */
    private IFile getUIFile(IFile javaFile) throws Exception {
        IProject project = javaFile.getProject();
        IJavaProject javaProject = JavaCore.create(project);
        // prepare form name
        String javaFormName = StringUtils.removeEnd(javaFile.getName(), ".java");
        // prepare package name
        String packageName;
        {
            IFolder folder = (IFolder) javaFile.getParent();
            IPackageFragment packageFragmentJava = (IPackageFragment) JavaCore.create(folder);
            packageName = packageFragmentJava.getElementName();
        }
        // try to find ui.xml file in package with same name
        for (IPackageFragmentRoot packageFragmentRoot : javaProject.getPackageFragmentRoots()) {
            IPackageFragment packageFragment = packageFragmentRoot.getPackageFragment(packageName);
            if (packageFragment.exists()) {
                for (Object object : packageFragment.getNonJavaResources()) {
                    if (object instanceof IFile) {
                        IFile uiFile = (IFile) object;
                        String uiFileName = uiFile.getName();
                        if (StringUtils.endsWithIgnoreCase(uiFileName, ".ui.xml")) {
                            String uiFormName = StringUtils.removeEndIgnoreCase(uiFileName, ".ui.xml");
                            if (uiFormName.equals(javaFormName)) {
                                return uiFile;
                            }
                        }
                    }
                }
            }
        }
        // no ui.xml file
        return null;
    }
}