org.sf.feeling.decompiler.editor.ClassFileSourceMap.java Source code

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Here is the source code for org.sf.feeling.decompiler.editor.ClassFileSourceMap.java

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/*******************************************************************************
 * Copyright (c) 2016 Chen Chao(cnfree2000@hotmail.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:
 *  Chen Chao  - initial API and implementation
 *******************************************************************************/

package org.sf.feeling.decompiler.editor;

import java.util.Arrays;

import org.eclipse.jdt.core.IBuffer;
import org.eclipse.jdt.core.IClassFile;
import org.eclipse.jdt.core.IType;
import org.eclipse.jdt.core.JavaModelException;
import org.eclipse.jdt.internal.compiler.env.IBinaryType;
import org.eclipse.jdt.internal.core.BufferManager;
import org.eclipse.jdt.internal.core.ClassFile;
import org.eclipse.jdt.internal.core.SourceMapper;

public class ClassFileSourceMap {

    private static IType getOuterMostEnclosingType(ClassFile cf) {
        IType type = cf.getType();
        IType enclosingType = type.getDeclaringType();
        while (enclosingType != null) {
            type = enclosingType;
            enclosingType = type.getDeclaringType();
        }
        return type;
    }

    private static void mapSource(JavaDecompilerBufferManager bufferManager, ClassFile cf, SourceMapper mapper,
            IBinaryType info, IClassFile bufferOwner, char[] markedSrc) {
        char[] contents = mapper.findSource(cf.getType(), info);
        if (Arrays.equals(markedSrc, contents))
            return;
        contents = markedSrc;
        if (contents != null) {
            // create buffer
            IBuffer buffer = BufferManager.createBuffer(bufferOwner);
            if (buffer == null)
                return;
            JavaDecompilerBufferManager bufManager = bufferManager;
            bufManager.addBuffer(buffer);

            // set the buffer source
            if (buffer.getCharacters() == null) {
                buffer.setContents(contents);
            }

            // listen to buffer changes
            // buffer.addBufferChangedListener( cf );

            // do the source mapping
            mapper.mapSource(getOuterMostEnclosingType(cf), contents, info);

            return;
        } else {
            // create buffer
            IBuffer buffer = BufferManager.createNullBuffer(bufferOwner);
            if (buffer == null)
                return;
            JavaDecompilerBufferManager bufManager = bufferManager;
            bufManager.addBuffer(buffer);

            // listen to buffer changes
            // buffer.addBufferChangedListener( cf );
            return;
        }
    }

    public static void updateSource(JavaDecompilerBufferManager bufferManager, ClassFile cf, char[] markedSrc)
            throws JavaModelException {
        IType type = cf.getType();
        if (!type.isBinary()) {
            return;
        }
        Object info = cf.getElementInfo();
        IType enclosingType = type.getDeclaringType();
        while (enclosingType != null) {
            type = enclosingType;
            enclosingType = type.getDeclaringType();
        }
        IType outerMostEnclosingType = type;
        SourceMapper mapper = cf.getSourceMapper();
        IBinaryType typeInfo = info instanceof IBinaryType ? (IBinaryType) info : null;
        if (mapper != null) {
            mapSource(bufferManager, cf, mapper, typeInfo, outerMostEnclosingType.getClassFile(), markedSrc);
        }

    }
}