org.eclipse.jst.pagedesigner.utils.JavaUtil.java Source code

Introduction

Here is the source code for org.eclipse.jst.pagedesigner.utils.JavaUtil.java

Source

/*******************************************************************************
 * Copyright (c) 2006 Sybase, Inc. and others.
 *
 * 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:
 *     Sybase, Inc. - initial API and implementation
 *******************************************************************************/
package org.eclipse.jst.pagedesigner.utils;

import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.Path;
import org.eclipse.jdt.core.IClasspathEntry;
import org.eclipse.jdt.core.IJarEntryResource;
import org.eclipse.jdt.core.IJavaProject;
import org.eclipse.jst.jsf.common.ui.IFileFolderConstants;
import org.eclipse.jst.pagedesigner.PDPlugin;

/**
 * @author mengbo
 */
public class JavaUtil {
    /**
     * 
     * @param javaProject
     * @param parent
     * @return the path in javaProject or new Path("") if not found on a class path
     * @author mengbo
     */
    public static IPath getPathOnClasspath(IJavaProject javaProject, Object parent) {
        IPath result = null;
        if (javaProject == null || parent == null) {
            return new Path(""); //$NON-NLS-1$
        }
        IClasspathEntry[] entries = javaProject.readRawClasspath();
        IPath classPath = null;
        if (parent instanceof IResource) {
            if (((javaProject != null) && !javaProject.isOnClasspath((IResource) parent))) {
                return new Path(""); //$NON-NLS-1$
            }
            if (parent instanceof IFile) {
                IPath elementPath = ((IFile) parent).getFullPath();
                if (((IFile) parent).getFileExtension().equalsIgnoreCase(IFileFolderConstants.EXT_PROPERTIES)) {
                    int machings = 0;
                    try {
                        for (int i = 0; i < entries.length; i++) {
                            // Determine whether on this classentry's path
                            machings = entries[i].getPath().matchingFirstSegments(elementPath);
                            if (machings > 0) {
                                // Get package name
                                classPath = elementPath.removeFirstSegments(machings).removeLastSegments(1);
                                break;
                            }
                        }
                        // Not on the classpath?
                        if (classPath == null) {
                            return null;
                        } else if (classPath.segmentCount() > 0)
                            result = javaProject.findElement(classPath).getPath().removeFirstSegments(machings)
                                    .append(((IFile) parent).getName());
                        else
                            result = ((IFile) parent).getFullPath().removeFirstSegments(machings);
                    } catch (Exception e) {
                        // Error.DesignerPropertyTool.NatureQuerying = Error in
                        // project java nature querying
                        PDPlugin.getLogger(JavaUtil.class).error("Error.DesignerPropertyTool.NatureQuerying", e); //$NON-NLS-1$
                        return null;
                    }
                }
            }
        } else if (parent instanceof IJarEntryResource) {
            IPath elementPath = ((IJarEntryResource) parent).getFullPath();
            if (elementPath.getFileExtension().equalsIgnoreCase(IFileFolderConstants.EXT_PROPERTIES)) {
                result = elementPath;
            }
        }
        if (result != null) {
            return result;
        }
        return new Path(""); //$NON-NLS-1$
    }

}