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AspectJ tools most notably contains the AspectJ compiler (AJC). AJC applies aspects to Java classes during compilation, fully replacing Javac for plain Java classes and also compiling native AspectJ or annotation-based @AspectJ syntax. Furthermore, AJC can weave aspects into existing class files in a post-compile binary weaving step. This library is a superset of AspectJ weaver and hence also of AspectJ runtime.

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/*******************************************************************************
 * Copyright (c) 2000, 2018 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.aspectj.org.eclipse.jdt.core.util;

/**
 * Description of a constant pool as described in the JVM specifications.
 *
 * This interface may be implemented by clients.
 *
 * @since 2.0
 */
public interface IConstantPool {

	/**
	 * Answer back the number of entries in the constant pool.
	 *
	 * @return the number of entries in the constant pool
	 */
	int getConstantPoolCount();

	/**
	 * Answer back the type of the entry at the given index in the constant pool.
	 *
	 * @param index the index of the entry in the constant pool
	 * @return the type of the entry at the index @index in the constant pool
	 */
	int getEntryKind(int index);

	/**
	 * Answer back the entry at the given index in the constant pool.
	 *
	 * The return value can be an instance of {@link IConstantPoolEntry2} if the value returned
	 * by {@link #getEntryKind(int)} is either {@link IConstantPoolConstant#CONSTANT_MethodHandle},
	 * {@link IConstantPoolConstant#CONSTANT_MethodType},
	 * {@link IConstantPoolConstant#CONSTANT_InvokeDynamic},
	 * {@link IConstantPoolConstant#CONSTANT_Dynamic}.
	 *
	 * The return value can be an instance of {@link IConstantPoolEntry3} if the value returned
	 * by {@link #getEntryKind(int)} is either {@link IConstantPoolConstant#CONSTANT_Module}
	 * or {@link IConstantPoolConstant#CONSTANT_Package}.
	 *
	 * @param index the index of the entry in the constant pool
	 * @return the entry at the given index in the constant pool
	 */
	IConstantPoolEntry decodeEntry(int index);
}