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.compiler.CharOperation;
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.IConstantPoolEntry3;
import org.eclipse.jdt.core.util.IModulePackagesAttribute;

Default implementation of IModulePackagesAttribute
/**
 * Default implementation of IModulePackagesAttribute
 */
public class ModulePackagesAttribute extends ClassFileAttribute implements IModulePackagesAttribute {

	private int packagesCount;
	private int[] packageIndices;
	private char[][] packageNames;

	
Constructor for ModulePackagesAttribute.
Params:
classFileBytes – 
constantPool – 
offset – 
Throws:
ClassFormatException – /**
	 * Constructor for ModulePackagesAttribute.
	 * @param classFileBytes
	 * @param constantPool
	 * @param offset
	 * @throws ClassFormatException
	 */
	public ModulePackagesAttribute(	byte[] classFileBytes,	IConstantPool constantPool,	int offset)	throws ClassFormatException {
		super(classFileBytes, constantPool, offset);
		int readOffset = 6;
		final int length = u2At(classFileBytes, readOffset, offset);
		readOffset += 2;
		this.packagesCount = length;
		if (length != 0) {
			this.packageIndices = new int[length];
			this.packageNames = new char[length][0];
			for (int i = 0; i < length; i++) {
				this.packageIndices[i] = u2At(classFileBytes, readOffset, offset);
				readOffset += 2;
				IConstantPoolEntry constantPoolEntry = constantPool.decodeEntry(this.packageIndices[i]);
				if (constantPoolEntry.getKind() != IConstantPoolConstant.CONSTANT_Package) {
					throw new ClassFormatException(ClassFormatException.INVALID_CONSTANT_POOL_ENTRY);
				}
				char[] name = ((IConstantPoolEntry3) constantPoolEntry).getPackageName();
				this.packageNames[i] = name != null ? name : CharOperation.NO_CHAR;

			}
		} else {
			this.packageNames = CharOperation.NO_CHAR_CHAR;
		}
	}

	@Override
	public int getPackagesCount() {
		return this.packagesCount;
	}

	@Override
	public int[] getPackageIndices() {
		return this.packageIndices;
	}

	@Override
	public char[][] getPackageNames() {
		return this.packageNames;
	}
}