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      1 /*
      2  * Licensed to the Apache Software Foundation (ASF) under one or more
      3  * contributor license agreements.  See the NOTICE file distributed with
      4  * this work for additional information regarding copyright ownership.
      5  * The ASF licenses this file to You under the Apache License, Version 2.0
      6  * (the "License"); you may not use this file except in compliance with
      7  * the License.  You may obtain a copy of the License at
      8  *
      9  *      http://www.apache.org/licenses/LICENSE-2.0
     10  *
     11  *  Unless required by applicable law or agreed to in writing, software
     12  *  distributed under the License is distributed on an "AS IS" BASIS,
     13  *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     14  *  See the License for the specific language governing permissions and
     15  *  limitations under the License.
     16  *
     17  */
     18 package org.apache.bcel.generic;
     19 
     20 import java.io.DataOutputStream;
     21 import java.io.IOException;
     22 
     23 import org.apache.bcel.ExceptionConst;
     24 import org.apache.bcel.util.ByteSequence;
     25 
     26 /**
     27  * NEWARRAY -  Create new array of basic type (int, short, ...)
     28  * <PRE>Stack: ..., count -&gt; ..., arrayref</PRE>
     29  * type must be one of T_INT, T_SHORT, ...
     30  *
     31  * @version $Id$
     32  */
     33 public class NEWARRAY extends Instruction implements AllocationInstruction, ExceptionThrower,
     34         StackProducer {
     35 
     36     private byte type;
     37 
     38 
     39     /**
     40      * Empty constructor needed for Instruction.readInstruction.
     41      * Not to be used otherwise.
     42      */
     43     NEWARRAY() {
     44     }
     45 
     46 
     47     public NEWARRAY(final byte type) {
     48         super(org.apache.bcel.Const.NEWARRAY, (short) 2);
     49         this.type = type;
     50     }
     51 
     52 
     53     public NEWARRAY(final BasicType type) {
     54         this(type.getType());
     55     }
     56 
     57 
     58     /**
     59      * Dump instruction as byte code to stream out.
     60      * @param out Output stream
     61      */
     62     @Override
     63     public void dump( final DataOutputStream out ) throws IOException {
     64         out.writeByte(super.getOpcode());
     65         out.writeByte(type);
     66     }
     67 
     68 
     69     /**
     70      * @return numeric code for basic element type
     71      */
     72     public final byte getTypecode() {
     73         return type;
     74     }
     75 
     76 
     77     /**
     78      * @return type of constructed array
     79      */
     80     public final Type getType() {
     81         return new ArrayType(BasicType.getType(type), 1);
     82     }
     83 
     84 
     85     /**
     86      * @return mnemonic for instruction
     87      */
     88     @Override
     89     public String toString( final boolean verbose ) {
     90         return super.toString(verbose) + " " + org.apache.bcel.Const.getTypeName(type);
     91     }
     92 
     93 
     94     /**
     95      * Read needed data (e.g. index) from file.
     96      */
     97     @Override
     98     protected void initFromFile( final ByteSequence bytes, final boolean wide ) throws IOException {
     99         type = bytes.readByte();
    100         super.setLength(2);
    101     }
    102 
    103 
    104     @Override
    105     public Class<?>[] getExceptions() {
    106         return new Class[] {
    107             ExceptionConst.NEGATIVE_ARRAY_SIZE_EXCEPTION
    108         };
    109     }
    110 
    111 
    112     /**
    113      * Call corresponding visitor method(s). The order is:
    114      * Call visitor methods of implemented interfaces first, then
    115      * call methods according to the class hierarchy in descending order,
    116      * i.e., the most specific visitXXX() call comes last.
    117      *
    118      * @param v Visitor object
    119      */
    120     @Override
    121     public void accept( final Visitor v ) {
    122         v.visitAllocationInstruction(this);
    123         v.visitExceptionThrower(this);
    124         v.visitStackProducer(this);
    125         v.visitNEWARRAY(this);
    126     }
    127 }
    128