| /* |
| * reserved comment block |
| * DO NOT REMOVE OR ALTER! |
| */ |
| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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 com.sun.org.apache.bcel.internal.classfile; |
| |
| |
| import com.sun.org.apache.bcel.internal.Constants; |
| import java.io.*; |
| |
| /** |
| * This class represents the type of a local variable or item on stack |
| * used in the StackMap entries. |
| * |
| * @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A> |
| * @see StackMapEntry |
| * @see StackMap |
| * @see Constants |
| */ |
| public final class StackMapType implements Cloneable { |
| private byte type; |
| private int index = -1; // Index to CONSTANT_Class or offset |
| private ConstantPool constant_pool; |
| |
| /** |
| * Construct object from file stream. |
| * @param file Input stream |
| * @throws IOException |
| */ |
| StackMapType(DataInputStream file, ConstantPool constant_pool) throws IOException |
| { |
| this(file.readByte(), -1, constant_pool); |
| |
| if(hasIndex()) |
| setIndex(file.readShort()); |
| |
| setConstantPool(constant_pool); |
| } |
| |
| /** |
| * @param type type tag as defined in the Constants interface |
| * @param index index to constant pool, or byte code offset |
| */ |
| public StackMapType(byte type, int index, ConstantPool constant_pool) { |
| setType(type); |
| setIndex(index); |
| setConstantPool(constant_pool); |
| } |
| |
| public void setType(byte t) { |
| if((t < Constants.ITEM_Bogus) || (t > Constants.ITEM_NewObject)) |
| throw new RuntimeException("Illegal type for StackMapType: " + t); |
| type = t; |
| } |
| |
| public byte getType() { return type; } |
| public void setIndex(int t) { index = t; } |
| |
| /** @return index to constant pool if type == ITEM_Object, or offset |
| * in byte code, if type == ITEM_NewObject, and -1 otherwise |
| */ |
| public int getIndex() { return index; } |
| |
| /** |
| * Dump type entries to file. |
| * |
| * @param file Output file stream |
| * @throws IOException |
| */ |
| public final void dump(DataOutputStream file) throws IOException |
| { |
| file.writeByte(type); |
| if(hasIndex()) |
| file.writeShort(getIndex()); |
| } |
| |
| /** @return true, if type is either ITEM_Object or ITEM_NewObject |
| */ |
| public final boolean hasIndex() { |
| return ((type == Constants.ITEM_Object) || |
| (type == Constants.ITEM_NewObject)); |
| } |
| |
| private String printIndex() { |
| if(type == Constants.ITEM_Object) |
| return ", class=" + constant_pool.constantToString(index, Constants.CONSTANT_Class); |
| else if(type == Constants.ITEM_NewObject) |
| return ", offset=" + index; |
| else |
| return ""; |
| } |
| |
| /** |
| * @return String representation |
| */ |
| public final String toString() { |
| return "(type=" + Constants.ITEM_NAMES[type] + printIndex() + ")"; |
| } |
| |
| /** |
| * @return deep copy of this object |
| */ |
| public StackMapType copy() { |
| try { |
| return (StackMapType)clone(); |
| } catch(CloneNotSupportedException e) {} |
| |
| return null; |
| } |
| |
| /** |
| * @return Constant pool used by this object. |
| */ |
| public final ConstantPool getConstantPool() { return constant_pool; } |
| |
| /** |
| * @param constant_pool Constant pool to be used for this object. |
| */ |
| public final void setConstantPool(ConstantPool constant_pool) { |
| this.constant_pool = constant_pool; |
| } |
| } |