/*
 * Copyright  2000-2004 The Apache Software Foundation
 *
 *  Licensed under the Apache License, Version 2.0 (the "License"); 
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License. 
 *
 */
package org.apache.bcel5_2_0.generic;

import org.apache.bcel5_2_0.Constants;
import org.apache.bcel5_2_0.ExceptionConstants;

/** 
 * GETSTATIC - Fetch static field from class
 * <PRE>Stack: ..., -> ..., value</PRE>
 * OR
 * <PRE>Stack: ..., -> ..., value.word1, value.word2</PRE>
 *
 * @version $Id: GETSTATIC.java 386056 2006-03-15 11:31:56Z tcurdt $
 * @author  <A HREF="mailto:m.dahm@gmx.de">M. Dahm</A>
 */
public class GETSTATIC extends FieldInstruction implements PushInstruction, ExceptionThrower {

    /**
     * Empty constructor needed for the Class.newInstance() statement in
     * Instruction.readInstruction(). Not to be used otherwise.
     */
    GETSTATIC() {
    }


    public GETSTATIC(int index) {
        super(Constants.GETSTATIC, index);
    }


    public int produceStack( ConstantPoolGen cpg ) {
        return getFieldSize(cpg);
    }


    public Class[] getExceptions() {
        Class[] cs = new Class[1 + ExceptionConstants.EXCS_FIELD_AND_METHOD_RESOLUTION.length];
        System.arraycopy(ExceptionConstants.EXCS_FIELD_AND_METHOD_RESOLUTION, 0, cs, 0,
                ExceptionConstants.EXCS_FIELD_AND_METHOD_RESOLUTION.length);
        cs[ExceptionConstants.EXCS_FIELD_AND_METHOD_RESOLUTION.length] = ExceptionConstants.INCOMPATIBLE_CLASS_CHANGE_ERROR;
        return cs;
    }


    /**
     * Call corresponding visitor method(s). The order is:
     * Call visitor methods of implemented interfaces first, then
     * call methods according to the class hierarchy in descending order,
     * i.e., the most specific visitXXX() call comes last.
     *
     * @param v Visitor object
     */
    public void accept( Visitor v ) {
        v.visitStackProducer(this);
        v.visitPushInstruction(this);
        v.visitExceptionThrower(this);
        v.visitTypedInstruction(this);
        v.visitLoadClass(this);
        v.visitCPInstruction(this);
        v.visitFieldOrMethod(this);
        v.visitFieldInstruction(this);
        v.visitGETSTATIC(this);
    }
}