Copyright (c) 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) 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.search.indexing;

import org.eclipse.core.runtime.IPath;
import org.eclipse.jdt.core.compiler.InvalidInputException;
import org.eclipse.jdt.internal.compiler.classfmt.ClassFileConstants;
import org.eclipse.jdt.internal.compiler.parser.Scanner;
import org.eclipse.jdt.internal.compiler.parser.TerminalTokens;
import org.eclipse.jdt.internal.compiler.util.SuffixConstants;

public abstract class BinaryContainer extends IndexRequest {

	Scanner scanner;
	public BinaryContainer(IPath containerPath, IndexManager manager) {
		super(containerPath, manager);
	}

	private boolean isIdentifier() throws InvalidInputException {
		switch(this.scanner.scanIdentifier()) {
			// assert and enum will not be recognized as java identifiers 
			// in 1.7 mode, which are in 1.3.
			case TerminalTokens.TokenNameIdentifier:
			case TerminalTokens.TokenNameassert:
			case TerminalTokens.TokenNameenum:
				return true;
			default:
				return false;
		}
	}
	protected boolean isValidPackageNameForClassOrisModule(String className) {
		if (className.substring(0, className.length() - (SuffixConstants.SUFFIX_CLASS.length)).equals(new String(IIndexConstants.MODULE_INFO))) 
			return true;
		char[] classNameArray = className.toCharArray();
		// use 1.7 as the source level as there are more valid identifiers in 1.7 mode
		// https://bugs.eclipse.org/bugs/show_bug.cgi?id=376673
		if (this.scanner == null)
			this.scanner = new Scanner(false /* comment */, true /* whitespace */, false /* nls */,
					ClassFileConstants.JDK1_7/* sourceLevel */, null/* taskTag */, null/* taskPriorities */, true /* taskCaseSensitive */);
		
		this.scanner.setSource(classNameArray); 
		this.scanner.eofPosition = classNameArray.length - SuffixConstants.SUFFIX_CLASS.length;
		try {
			if (isIdentifier()) {
				while (this.scanner.eofPosition > this.scanner.currentPosition) {
					if (this.scanner.getNextChar() != '/' || this.scanner.eofPosition <= this.scanner.currentPosition) {
						return false;
					}
					if (!isIdentifier()) return false;
				}
				return true;
			}
		} catch (InvalidInputException e) {
			// invalid class name
		}
		return false;
	}
}