Copyright (c) 2004, 2009 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) 2004, 2009 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.IAnnotationComponent;
import org.eclipse.jdt.core.util.IAnnotationComponentValue;
import org.eclipse.jdt.core.util.IConstantPool;
import org.eclipse.jdt.core.util.IConstantPoolConstant;
import org.eclipse.jdt.core.util.IConstantPoolEntry;

Default implementation of IAnnotationComponent
/**
 * Default implementation of IAnnotationComponent
 */
public class AnnotationComponent extends ClassFileStruct implements IAnnotationComponent {

	private int componentNameIndex;
	private char[] componentName;
	private IAnnotationComponentValue componentValue;
	private int readOffset;

	public AnnotationComponent(
			byte[] classFileBytes,
			IConstantPool constantPool,
			int offset) throws ClassFormatException {
		final int nameIndex = u2At(classFileBytes, 0, offset);
		this.componentNameIndex = nameIndex;
		if (nameIndex != 0) {
			IConstantPoolEntry constantPoolEntry = constantPool.decodeEntry(nameIndex);
			if (constantPoolEntry.getKind() != IConstantPoolConstant.CONSTANT_Utf8) {
				throw new ClassFormatException(ClassFormatException.INVALID_CONSTANT_POOL_ENTRY);
			}
			this.componentName = constantPoolEntry.getUtf8Value();
		}
		this.readOffset = 2;
		AnnotationComponentValue value = new AnnotationComponentValue(classFileBytes, constantPool, offset + this.readOffset);
		this.componentValue = value;
		this.readOffset += value.sizeInBytes();
	}

	@Override
	public int getComponentNameIndex() {
		return this.componentNameIndex;
	}

	@Override
	public char[] getComponentName() {
		return this.componentName;
	}

	@Override
	public IAnnotationComponentValue getComponentValue() {
		return this.componentValue;
	}

	int sizeInBytes() {
		return this.readOffset;
	}
}