Copyright (c) 2000, 2017 IBM Corporation and others.
This program and the accompanying materials
are made available under the terms of the Eclipse Public License 2.0
which accompanies this distribution, and is available at
https://www.eclipse.org/legal/epl-2.0/
SPDX-License-Identifier: EPL-2.0
Contributors:
    IBM Corporation - initial API and implementation
    Stephan Herrmann - Contribution for Bug 337935 - Test failures when run as an IDE (org.eclipse.sdk.ide)
/*******************************************************************************
 * Copyright (c) 2000, 2017 IBM Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *     Stephan Herrmann - Contribution for Bug 337935 - Test failures when run as an IDE (org.eclipse.sdk.ide)
 *******************************************************************************/
package org.eclipse.jdt.internal.core;

import org.eclipse.core.resources.IResource;
import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.jdt.core.IBuffer;
import org.eclipse.jdt.core.IJavaElement;
import org.eclipse.jdt.core.IJavaModelStatusConstants;
import org.eclipse.jdt.core.JavaModelException;
import org.eclipse.jdt.core.ToolFactory;
import org.eclipse.jdt.core.WorkingCopyOwner;
import org.eclipse.jdt.core.compiler.CharOperation;
import org.eclipse.jdt.core.util.ClassFileBytesDisassembler;
import org.eclipse.jdt.core.util.IClassFileReader;
import org.eclipse.jdt.internal.compiler.lookup.TypeConstants;
import org.eclipse.jdt.internal.core.util.Disassembler;
import org.eclipse.jdt.internal.core.util.Util;

A working copy on an IClassFile.
/**
 * A working copy on an <code>IClassFile</code>.
 */
public class ClassFileWorkingCopy extends CompilationUnit {

	public AbstractClassFile classFile;

public ClassFileWorkingCopy(AbstractClassFile classFile, WorkingCopyOwner owner) {
	super((PackageFragment) classFile.getParent(), sourceFileName(classFile), owner);
	this.classFile = classFile;
}
private static String sourceFileName(AbstractClassFile classFile) {
	if (classFile instanceof ModularClassFile)
		return TypeConstants.MODULE_INFO_FILE_NAME_STRING;
	else
		return ((BinaryType) ((ClassFile) classFile).getType()).getSourceFileName(null/*no info available*/);
}

@Override
public void commitWorkingCopy(boolean force, IProgressMonitor monitor) throws JavaModelException {
	throw new JavaModelException(new JavaModelStatus(IJavaModelStatusConstants.INVALID_ELEMENT_TYPES, this));
}

@Override
public IBuffer getBuffer() throws JavaModelException {
	if (isWorkingCopy())
		return super.getBuffer();
	else
		return this.classFile.getBuffer();
}

@Override
public char[] getContents() {
	try {
		IBuffer buffer = getBuffer();
		if (buffer == null) return CharOperation.NO_CHAR;
		char[] characters = buffer.getCharacters();
		if (characters == null) return CharOperation.NO_CHAR;
		return characters;
	} catch (JavaModelException e) {
		return CharOperation.NO_CHAR;
	}
}

@Override
public IPath getPath() {
	return this.classFile.getPath();
}

@Override
public IJavaElement getPrimaryElement(boolean checkOwner) {
	if (checkOwner && isPrimary()) return this;
	return new ClassFileWorkingCopy(this.classFile, DefaultWorkingCopyOwner.PRIMARY);
}

@Override
public IResource resource(PackageFragmentRoot root) {
	if (root.isArchive())
		return root.resource(root);
	return this.classFile.resource(root);
}

See Also:
openBuffer.openBuffer(IProgressMonitor, Object)/**
 * @see Openable#openBuffer(IProgressMonitor, Object)
 */
@Override
protected IBuffer openBuffer(IProgressMonitor pm, Object info) throws JavaModelException {

	// create buffer
	IBuffer buffer = BufferManager.createBuffer(this);

	// set the buffer source
	IBuffer classFileBuffer = this.classFile.getBuffer();
	if (classFileBuffer != null) {
		buffer.setContents(classFileBuffer.getCharacters());
	} else {
		// Disassemble
		IClassFileReader reader = ToolFactory.createDefaultClassFileReader(this.classFile, IClassFileReader.ALL);
		Disassembler disassembler = new Disassembler();
		String contents = disassembler.disassemble(reader, Util.getLineSeparator("", getJavaProject()), ClassFileBytesDisassembler.WORKING_COPY); //$NON-NLS-1$
		buffer.setContents(contents);
	}

	// add buffer to buffer cache
	BufferManager bufManager = getBufferManager();
	bufManager.addBuffer(buffer);

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

	return buffer;
}

@Override
protected void toStringName(StringBuffer buffer) {
	buffer.append(this.classFile.getElementName());
}

}