/*
 * ProGuard -- shrinking, optimization, obfuscation, and preverification
 *             of Java bytecode.
 *
 * Copyright (c) 2002-2018 GuardSquare NV
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; either version 2 of the License, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
package proguard.classfile.attribute.annotation;

import proguard.classfile.*;
import proguard.classfile.attribute.annotation.visitor.ElementValueVisitor;
import proguard.classfile.visitor.*;

/**
 * This ElementValue represents an enumeration constant element value.
 *
 * @author Eric Lafortune
 */
public class EnumConstantElementValue extends ElementValue
{
    public int u2typeNameIndex;
    public int u2constantNameIndex;

    /**
     * An extra field pointing to the Clazz objects referenced in the
     * type name string. This field is typically filled out by the <code>{@link
     * proguard.classfile.util.ClassReferenceInitializer
     * ClassReferenceInitializer}</code>.
     * References to primitive types are ignored.
     */
    public Clazz[] referencedClasses;

    /**
     * An extra field optionally pointing to the referenced enum Field object.
     * This field is typically filled out by the <code>{@link
     * proguard.classfile.util.ClassReferenceInitializer
     * ClassReferenceInitializer}</code>.
     */
    public Field referencedField;


    /**
     * Creates an uninitialized EnumConstantElementValue.
     */
    public EnumConstantElementValue()
    {
    }


    /**
     * Creates an initialized EnumConstantElementValue.
     */
    public EnumConstantElementValue(int u2elementNameIndex,
                                    int u2typeNameIndex,
                                    int u2constantNameIndex)
    {
        super(u2elementNameIndex);

        this.u2typeNameIndex     = u2typeNameIndex;
        this.u2constantNameIndex = u2constantNameIndex;
    }


    /**
     * Returns the enumeration type name.
     */
    public String getTypeName(Clazz clazz)
    {
        return clazz.getString(u2typeNameIndex);
    }


    /**
     * Returns the constant name.
     */
    public String getConstantName(Clazz clazz)
    {
        return clazz.getString(u2constantNameIndex);
    }


    /**
     * Applies the given visitor to all referenced classes.
     */
    public void referencedClassesAccept(ClassVisitor classVisitor)
    {
        if (referencedClasses != null)
        {
            for (int index = 0; index < referencedClasses.length; index++)
            {
                Clazz referencedClass = referencedClasses[index];
                if (referencedClass != null)
                {
                    referencedClass.accept(classVisitor);
                }
            }
        }
    }


    /**
     * Applies the given visitor to the referenced field.
     */
    public void referencedFieldAccept(MemberVisitor memberVisitor)
    {
        if (referencedField != null)
        {
            referencedField.accept(referencedClasses[0],
                                   memberVisitor);
        }
    }


    // Implementations for ElementValue.

    public char getTag()
    {
        return ClassConstants.ELEMENT_VALUE_ENUM_CONSTANT;
    }

    public void accept(Clazz clazz, Annotation annotation, ElementValueVisitor elementValueVisitor)
    {
        elementValueVisitor.visitEnumConstantElementValue(clazz, annotation, this);
    }
}
