NameAndTypeConstant.java

/*******************************************************************************
 * Copyright (c) 1998, 2015 Oracle and/or its affiliates. All rights reserved.
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v1.0 and Eclipse Distribution License v. 1.0
 * which accompanies this distribution.
 * The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html
 * and the Eclipse Distribution License is available at
 * http://www.eclipse.org/org/documents/edl-v10.php.
 *
 * Contributors:
 *     Oracle - initial API and implementation from Oracle TopLink
******************************************************************************/
package org.eclipse.persistence.tools.workbench.utility.classfile;

import java.io.IOException;

import org.eclipse.persistence.tools.workbench.utility.classfile.tools.ClassFileDataInputStream;
import org.eclipse.persistence.tools.workbench.utility.io.IndentingPrintWriter;


/**
 * This class models a class file "name and type" constant:
 *     u1 tag;
 *     u2 name_index;
 *     u2 descriptor_index;
 *
 * The "type" is not really a "type", but either a "field descriptor" or a
 * "method descriptor"; so it may actually contain multiple "types".
 *
 * See "The Java Virtual Machine Specification" Chapter 4.
 */
public class NameAndTypeConstant extends Constant {
    private short nameIndex;
    private short descriptorIndex;

    /**
     * Construct a class file constant from the specified stream
     * of byte codes.
     */
    NameAndTypeConstant(ConstantPool pool, byte tag, ClassFileDataInputStream stream) throws IOException {
        super(pool, tag, stream);
    }

    void initialize(ClassFileDataInputStream stream) throws IOException {
        this.nameIndex = stream.readU2();
        this.descriptorIndex = stream.readU2();
    }

    public void displayStringOn(IndentingPrintWriter writer) {
        super.displayStringOn(writer);
        writer.print(" name: ");
        writer.print(this.name());
        writer.print("  descriptor: ");
        writer.println(this.descriptor());
    }

    public String description() {
        return "name & type";
    }

    public String name() {
        return this.utf8String(this.nameIndex);
    }

    public String descriptor() {
        return this.utf8String(this.descriptorIndex);
    }

    public short getNameIndex() {
        return this.nameIndex;
    }

    public short getDescriptorIndex() {
        return this.descriptorIndex;
    }

    public Object value() {
        return this.name() + ':' + this.descriptor();
    }

    public void accept(Visitor visitor) {
        visitor.visit(this);
    }

}