    001/*
    002 * Licensed to the Apache Software Foundation (ASF) under one or more
    003 * contributor license agreements.  See the NOTICE file distributed with
    004 * this work for additional information regarding copyright ownership.
    005 * The ASF licenses this file to You under the Apache License, Version 2.0
    006 * (the "License"); you may not use this file except in compliance with
    007 * the License.  You may obtain a copy of the License at
    008 *
    009 *      http://www.apache.org/licenses/LICENSE-2.0
    010 *
    011 *  Unless required by applicable law or agreed to in writing, software
    012 *  distributed under the License is distributed on an "AS IS" BASIS,
    013 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    014 *  See the License for the specific language governing permissions and
    015 *  limitations under the License.
    016 *
    017 */
    018package org.apache.bcel.generic;
    019
    020import java.io.DataOutputStream;
    021import java.io.IOException;
    022
    023import org.apache.bcel.ExceptionConst;
    024import org.apache.bcel.classfile.ConstantPool;
    025import org.apache.bcel.util.ByteSequence;
    026
    027/**
    028 * MULTIANEWARRAY - Create new mutidimensional array of references
    029 *
    030 * <PRE>
    031 * Stack: ..., count1, [count2, ...] -&gt; ..., arrayref
    032 * </PRE>
    033 *
    034 */
    035public class MULTIANEWARRAY extends CPInstruction implements LoadClass, AllocationInstruction, ExceptionThrower {
    036
    037    private short dimensions;
    038
    039    /**
    040     * Empty constructor needed for Instruction.readInstruction. Not to be used otherwise.
    041     */
    042    MULTIANEWARRAY() {
    043    }
    044
    045    public MULTIANEWARRAY(final int index, final short dimensions) {
    046        super(org.apache.bcel.Const.MULTIANEWARRAY, index);
    047        if (dimensions < 1) {
    048            throw new ClassGenException("Invalid dimensions value: " + dimensions);
    049        }
    050        this.dimensions = dimensions;
    051        super.setLength(4);
    052    }
    053
    054    /**
    055     * Call corresponding visitor method(s). The order is: Call visitor methods of implemented interfaces first, then call
    056     * methods according to the class hierarchy in descending order, i.e., the most specific visitXXX() call comes last.
    057     *
    058     * @param v Visitor object
    059     */
    060    @Override
    061    public void accept(final Visitor v) {
    062        v.visitLoadClass(this);
    063        v.visitAllocationInstruction(this);
    064        v.visitExceptionThrower(this);
    065        v.visitTypedInstruction(this);
    066        v.visitCPInstruction(this);
    067        v.visitMULTIANEWARRAY(this);
    068    }
    069
    070    /**
    071     * Also works for instructions whose stack effect depends on the constant pool entry they reference.
    072     *
    073     * @return Number of words consumed from stack by this instruction
    074     */
    075    @Override
    076    public int consumeStack(final ConstantPoolGen cpg) {
    077        return dimensions;
    078    }
    079
    080    /**
    081     * Dump instruction as byte code to stream out.
    082     *
    083     * @param out Output stream
    084     */
    085    @Override
    086    public void dump(final DataOutputStream out) throws IOException {
    087        out.writeByte(super.getOpcode());
    088        out.writeShort(super.getIndex());
    089        out.writeByte(dimensions);
    090    }
    091
    092    /**
    093     * @return number of dimensions to be created
    094     */
    095    public final short getDimensions() {
    096        return dimensions;
    097    }
    098
    099    @Override
    100    public Class<?>[] getExceptions() {
    101        return ExceptionConst.createExceptions(ExceptionConst.EXCS.EXCS_CLASS_AND_INTERFACE_RESOLUTION, ExceptionConst.ILLEGAL_ACCESS_ERROR,
    102            ExceptionConst.NEGATIVE_ARRAY_SIZE_EXCEPTION);
    103    }
    104
    105    @Override
    106    public ObjectType getLoadClassType(final ConstantPoolGen cpg) {
    107        Type t = getType(cpg);
    108        if (t instanceof ArrayType) {
    109            t = ((ArrayType) t).getBasicType();
    110        }
    111        return t instanceof ObjectType ? (ObjectType) t : null;
    112    }
    113
    114    /**
    115     * Read needed data (i.e., no. dimension) from file.
    116     */
    117    @Override
    118    protected void initFromFile(final ByteSequence bytes, final boolean wide) throws IOException {
    119        super.initFromFile(bytes, wide);
    120        dimensions = bytes.readByte();
    121        super.setLength(4);
    122    }
    123
    124    /**
    125     * @return mnemonic for instruction
    126     */
    127    @Override
    128    public String toString(final boolean verbose) {
    129        return super.toString(verbose) + " " + super.getIndex() + " " + dimensions;
    130    }
    131
    132    /**
    133     * @return mnemonic for instruction with symbolic references resolved
    134     */
    135    @Override
    136    public String toString(final ConstantPool cp) {
    137        return super.toString(cp) + " " + dimensions;
    138    }
    139}