org.eclipse.wst.jsdt.internal.ui.viewsupport.SourcePositionComparator.java Source code

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Here is the source code for org.eclipse.wst.jsdt.internal.ui.viewsupport.SourcePositionComparator.java

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/*******************************************************************************
 * Copyright (c) 2000, 2008 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
 *******************************************************************************/
package org.eclipse.wst.jsdt.internal.ui.viewsupport;

import org.eclipse.jface.viewers.Viewer;
import org.eclipse.jface.viewers.ViewerComparator;
import org.eclipse.wst.jsdt.core.Flags;
import org.eclipse.wst.jsdt.core.IClassFile;
import org.eclipse.wst.jsdt.core.IJavaScriptUnit;
import org.eclipse.wst.jsdt.core.IJavaScriptElement;
import org.eclipse.wst.jsdt.core.IMember;
import org.eclipse.wst.jsdt.core.ISourceRange;
import org.eclipse.wst.jsdt.core.ISourceReference;
import org.eclipse.wst.jsdt.core.IType;
import org.eclipse.wst.jsdt.core.JavaScriptModelException;

/**
 *  Viewer sorter which sorts the Java elements like
 *  they appear in the source.
 * 
 * 
 */
public class SourcePositionComparator extends ViewerComparator {

    /*
     * @see org.eclipse.jface.viewers.ViewerSorter#compare(org.eclipse.jface.viewers.Viewer, java.lang.Object, java.lang.Object)
     */
    public int compare(Viewer viewer, Object e1, Object e2) {
        if (!(e1 instanceof ISourceReference))
            return 0;
        if (!(e2 instanceof ISourceReference))
            return 0;

        IJavaScriptElement parent1 = ((IJavaScriptElement) e1).getParent();
        if (parent1 == null || !parent1.equals(((IJavaScriptElement) e2).getParent())) {
            IType t1 = getOutermostDeclaringType(e1);
            if (t1 == null)
                return 0;

            IType t2 = getOutermostDeclaringType(e2);
            try {
                if (!t1.equals(t2)) {
                    if (t2 == null)
                        return 0;

                    if (Flags.isPublic(t1.getFlags()) && Flags.isPublic(t2.getFlags()))
                        return 0;

                    if (!t1.getPackageFragment().equals(t2.getPackageFragment()))
                        return 0;

                    IJavaScriptUnit cu1 = (IJavaScriptUnit) ((IJavaScriptElement) e1)
                            .getAncestor(IJavaScriptElement.JAVASCRIPT_UNIT);
                    if (cu1 != null) {
                        if (!cu1.equals(((IJavaScriptElement) e2).getAncestor(IJavaScriptElement.JAVASCRIPT_UNIT)))
                            return 0;
                    } else {
                        IClassFile cf1 = (IClassFile) ((IJavaScriptElement) e1)
                                .getAncestor(IJavaScriptElement.CLASS_FILE);
                        if (cf1 == null)
                            return 0;
                        IClassFile cf2 = (IClassFile) ((IJavaScriptElement) e2)
                                .getAncestor(IJavaScriptElement.CLASS_FILE);
                        String source1 = cf1.getSource();
                        if (source1 != null && !source1.equals(cf2.getSource()))
                            return 0;
                    }
                }
            } catch (JavaScriptModelException e3) {
                return 0;
            }
        }

        try {
            ISourceRange sr1 = ((ISourceReference) e1).getSourceRange();
            ISourceRange sr2 = ((ISourceReference) e2).getSourceRange();
            if (sr1 == null || sr2 == null)
                return 0;

            return sr1.getOffset() - sr2.getOffset();

        } catch (JavaScriptModelException e) {
            return 0;
        }
    }

    private IType getOutermostDeclaringType(Object element) {
        if (!(element instanceof IMember))
            return null;

        IType declaringType;
        if (element instanceof IType)
            declaringType = (IType) element;
        else {
            declaringType = ((IMember) element).getDeclaringType();
            if (declaringType == null)
                return null;
        }

        IType declaringTypeDeclaringType = declaringType.getDeclaringType();
        while (declaringTypeDeclaringType != null) {
            declaringType = declaringTypeDeclaringType;
            declaringTypeDeclaringType = declaringType.getDeclaringType();
        }
        return declaringType;
    }
}