com.ibm.research.tours.content.url.delegates.ClassFileURLTourElementDelegate.java Source code

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Here is the source code for com.ibm.research.tours.content.url.delegates.ClassFileURLTourElementDelegate.java

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/*******************************************************************************
 * Copyright (c) 2006-2007 IBM Corporation 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:
 *     IBM Corporation - initial API and implementation
 *     IBM Research
 *******************************************************************************/
package com.ibm.research.tours.content.url.delegates;

import java.util.ArrayList;

import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.Path;
import org.eclipse.jdt.core.IClassFile;
import org.eclipse.jdt.core.IJavaElement;
import org.eclipse.jdt.core.IPackageFragmentRoot;
import org.eclipse.jdt.core.JavaCore;
import org.eclipse.jdt.internal.corext.util.JavaModelUtil;
import org.eclipse.jdt.ui.JavaElementLabelProvider;
import org.eclipse.swt.graphics.Image;

import com.ibm.research.tours.ITourElement;
import com.ibm.research.tours.content.ToursContentPlugin;
import com.ibm.research.tours.content.elements.ResourceURLTourElement;
import com.ibm.research.tours.content.url.IURL;

public class ClassFileURLTourElementDelegate implements IURLTourElementDelegate {
    private JavaElementLabelProvider fJavaElementLabelProvider;
    private JavaElementLabelProvider fRuntimeJavaElementLabelProvider;
    private IClassFile fFile;

    public ClassFileURLTourElementDelegate(IClassFile file) {
        fFile = file;
        init();
    }

    private void init() {
        IPackageFragmentRoot root = null;
        root = JavaModelUtil.getPackageFragmentRoot(fFile);

        String[] entries = JavaCore.getClasspathVariableNames();
        ArrayList elements = new ArrayList(entries.length);

        for (int i = 0; i < entries.length; i++) {
            String name = entries[i];
            IPath entryPath = JavaCore.getClasspathVariable(name);
            IPath fullPath = root.getPath();

            if (entryPath != null) {
                if (entryPath.isPrefixOf(fullPath)) {
                    int matchingSegments = fullPath.matchingFirstSegments(entryPath);
                    int numSegments = fullPath.segmentCount();
                    String[] segments = fullPath.segments();
                    String path = name + Path.SEPARATOR;

                    for (int j = matchingSegments; j < numSegments; j++) {
                        path = path + segments[j];

                        if (j != numSegments - 1)
                            path = path + Path.SEPARATOR;
                    }
                    break;
                }
            }
        }

    }

    private JavaElementLabelProvider getJavaElementLabelProvider() {
        if (fJavaElementLabelProvider == null)
            fJavaElementLabelProvider = new JavaElementLabelProvider(JavaElementLabelProvider.SHOW_QUALIFIED
                    | JavaElementLabelProvider.SHOW_SMALL_ICONS | JavaElementLabelProvider.SHOW_PARAMETERS);
        return fJavaElementLabelProvider;
    }

    private JavaElementLabelProvider getRuntimeJavaElementLabelProvider() {
        if (fRuntimeJavaElementLabelProvider == null)
            fRuntimeJavaElementLabelProvider = new JavaElementLabelProvider(
                    JavaElementLabelProvider.SHOW_SMALL_ICONS | JavaElementLabelProvider.SHOW_PARAMETERS);
        return fRuntimeJavaElementLabelProvider;
    }

    public ITourElement createClone() {
        return new ResourceURLTourElement(fFile);
    }

    public Image getImage() {
        return ToursContentPlugin.getImage(fFile);
    }

    public String getShortText() {
        return getRuntimeJavaElementLabelProvider().getText(fFile);
    }

    public String getText() {
        return getJavaElementLabelProvider().getText(fFile);
    }

    public void start() {
        //      try 
        //      {
        //      fMarker = fFile.createMarker("com.ibm.research.tours.content.tourtextmarker");
        //      fMarker.setAttribute(IMarker.CHAR_START, fTextRegion.getOffset());
        //      fMarker.setAttribute(IMarker.CHAR_END, fTextRegion.getOffset() + fTextRegion.getLength());
        //      } 
        //      catch (CoreException e) 
        //      {
        //      e.printStackTrace();
        //      }
    }

    public void stop() {
    }

    public void transition() {

    }

    public IURL getUrl() {
        return null;
    }

    /**
     * Returns the package fragment root of this file.
     */
    private IPackageFragmentRoot getPackageFragmentRoot(IClassFile file) {

        IJavaElement element = file.getParent();
        while (element != null && element.getElementType() != IJavaElement.PACKAGE_FRAGMENT_ROOT)
            element = element.getParent();

        return (IPackageFragmentRoot) element;
    }
}