Copyright (c) 2000, 2016 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
/*******************************************************************************
 * Copyright (c) 2000, 2016 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
 *******************************************************************************/
package org.eclipse.jdt.internal.core.util;

import org.eclipse.core.resources.IFile;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.jdt.core.compiler.CharOperation;
import org.eclipse.jdt.internal.compiler.env.ICompilationUnit;

An ICompilationUnit that retrieves its contents using an IFile
/**
 * An ICompilationUnit that retrieves its contents using an IFile
 */
public class ResourceCompilationUnit implements ICompilationUnit {

	private IFile file;
	private char[] contents;
	private char[] fileName;
	private char[] mainTypeName;
	private char[] module;
	public ResourceCompilationUnit(IFile file, char[] mod) {
		this.file = file;
		this.module = mod;
		String f = file.getFullPath().toString();
		this.fileName = f.toCharArray();
		int start = f.lastIndexOf("/") + 1; //$NON-NLS-1$
		if (start == 0 || start < f.lastIndexOf("\\")) //$NON-NLS-1$
			start = f.lastIndexOf("\\") + 1; //$NON-NLS-1$

		int end = f.lastIndexOf("."); //$NON-NLS-1$
		if (end == -1)
			end = f.length();

		this.mainTypeName = f.substring(start, end).toCharArray();
	}

	@Override
	public char[] getContents() {
		if (this.contents != null)
			return this.contents;   // answer the cached source

		// otherwise retrieve it
		try {
			return (this.contents = Util.getResourceContentsAsCharArray(this.file));
		} catch (CoreException e) {
			return CharOperation.NO_CHAR;
		}
	}

	@Override
	public char[] getFileName() {
		return this.fileName;
	}

	@Override
	public char[] getMainTypeName() {
		return this.mainTypeName;
	}

	@Override
	public char[][] getPackageName() {
		return null;
	}

	@Override
	public boolean ignoreOptionalProblems() {
		return false;
	}

	@Override
	public char[] getModuleName() {
		return this.module;
	}
}