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

import org.eclipse.jdt.core.util.ClassFormatException;
import org.eclipse.jdt.core.util.IConstantPool;
import org.eclipse.jdt.core.util.IConstantPoolConstant;
import org.eclipse.jdt.core.util.IConstantPoolEntry;
import org.eclipse.jdt.core.util.IModuleMainClassAttribute;

Default implementation of IModuleMainClassAttribute
/**
 * Default implementation of IModuleMainClassAttribute
 */
public class ModuleMainClassAttribute extends ClassFileAttribute implements IModuleMainClassAttribute {

	private final int mainClassIndex;
	private final char[] mainClassName;

	
Constructor for ModuleMainClassAttribute.
Params:
classFileBytes – 
constantPool – 
offset – 
Throws:
ClassFormatException – /**
	 * Constructor for ModuleMainClassAttribute.
	 * @param classFileBytes
	 * @param constantPool
	 * @param offset
	 * @throws ClassFormatException
	 */
	public ModuleMainClassAttribute(	byte[] classFileBytes,	IConstantPool constantPool,	int offset)	throws ClassFormatException {
		super(classFileBytes, constantPool, offset);
		int readOffset = 6;
		this.mainClassIndex = u2At(classFileBytes, readOffset, offset);
		IConstantPoolEntry constantPoolEntry = constantPool.decodeEntry(this.mainClassIndex);
		if (constantPoolEntry.getKind() != IConstantPoolConstant.CONSTANT_Class) {
			throw new ClassFormatException(ClassFormatException.INVALID_CONSTANT_POOL_ENTRY);
		}
		this.mainClassName = constantPoolEntry.getClassInfoName();
	}

	@Override
	public int getMainClassIndex() {
		return this.mainClassIndex;
	}

	@Override
	public char[] getMainClassName() {
		return this.mainClassName;
	}
}