| /* |
| * 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 java.io.DataInput; |
| import java.io.DataOutputStream; |
| import java.io.IOException; |
| |
| import com.sun.org.apache.bcel.internal.Const; |
| |
| /** |
| * This class represents the table of exceptions that are thrown by a |
| * method. This attribute may be used once per method. The name of |
| * this class is <em>ExceptionTable</em> for historical reasons; The |
| * Java Virtual Machine Specification, Second Edition defines this |
| * attribute using the name <em>Exceptions</em> (which is inconsistent |
| * with the other classes). |
| * |
| * @see Code |
| */ |
| public final class ExceptionTable extends Attribute { |
| |
| private int[] exception_index_table; // constant pool |
| |
| |
| /** |
| * Initialize from another object. Note that both objects use the same |
| * references (shallow copy). Use copy() for a physical copy. |
| */ |
| public ExceptionTable(final ExceptionTable c) { |
| this(c.getNameIndex(), c.getLength(), c.getExceptionIndexTable(), c.getConstantPool()); |
| } |
| |
| |
| /** |
| * @param name_index Index in constant pool |
| * @param length Content length in bytes |
| * @param exception_index_table Table of indices in constant pool |
| * @param constant_pool Array of constants |
| */ |
| public ExceptionTable(final int name_index, final int length, final int[] exception_index_table, |
| final ConstantPool constant_pool) { |
| super(Const.ATTR_EXCEPTIONS, name_index, length, constant_pool); |
| this.exception_index_table = exception_index_table != null ? exception_index_table : new int[0]; |
| } |
| |
| |
| /** |
| * Construct object from input stream. |
| * @param name_index Index in constant pool |
| * @param length Content length in bytes |
| * @param input Input stream |
| * @param constant_pool Array of constants |
| * @throws IOException |
| */ |
| ExceptionTable(final int name_index, final int length, final DataInput input, final ConstantPool constant_pool) throws IOException { |
| this(name_index, length, (int[]) null, constant_pool); |
| final int number_of_exceptions = input.readUnsignedShort(); |
| exception_index_table = new int[number_of_exceptions]; |
| for (int i = 0; i < number_of_exceptions; i++) { |
| exception_index_table[i] = input.readUnsignedShort(); |
| } |
| } |
| |
| |
| /** |
| * Called by objects that are traversing the nodes of the tree implicitely |
| * defined by the contents of a Java class. I.e., the hierarchy of methods, |
| * fields, attributes, etc. spawns a tree of objects. |
| * |
| * @param v Visitor object |
| */ |
| @Override |
| public void accept( final Visitor v ) { |
| v.visitExceptionTable(this); |
| } |
| |
| |
| /** |
| * Dump exceptions attribute to file stream in binary format. |
| * |
| * @param file Output file stream |
| * @throws IOException |
| */ |
| @Override |
| public void dump( final DataOutputStream file ) throws IOException { |
| super.dump(file); |
| file.writeShort(exception_index_table.length); |
| for (final int index : exception_index_table) { |
| file.writeShort(index); |
| } |
| } |
| |
| |
| /** |
| * @return Array of indices into constant pool of thrown exceptions. |
| */ |
| public int[] getExceptionIndexTable() { |
| return exception_index_table; |
| } |
| |
| |
| /** |
| * @return Length of exception table. |
| */ |
| public int getNumberOfExceptions() { |
| return exception_index_table == null ? 0 : exception_index_table.length; |
| } |
| |
| |
| /** |
| * @return class names of thrown exceptions |
| */ |
| public String[] getExceptionNames() { |
| final String[] names = new String[exception_index_table.length]; |
| for (int i = 0; i < exception_index_table.length; i++) { |
| names[i] = super.getConstantPool().getConstantString(exception_index_table[i], |
| Const.CONSTANT_Class).replace('/', '.'); |
| } |
| return names; |
| } |
| |
| |
| /** |
| * @param exception_index_table the list of exception indexes |
| * Also redefines number_of_exceptions according to table length. |
| */ |
| public void setExceptionIndexTable( final int[] exception_index_table ) { |
| this.exception_index_table = exception_index_table != null ? exception_index_table : new int[0]; |
| } |
| |
| |
| /** |
| * @return String representation, i.e., a list of thrown exceptions. |
| */ |
| @Override |
| public String toString() { |
| final StringBuilder buf = new StringBuilder(); |
| String str; |
| buf.append("Exceptions: "); |
| for (int i = 0; i < exception_index_table.length; i++) { |
| str = super.getConstantPool().getConstantString(exception_index_table[i], Const.CONSTANT_Class); |
| buf.append(Utility.compactClassName(str, false)); |
| if (i < exception_index_table.length - 1) { |
| buf.append(", "); |
| } |
| } |
| return buf.toString(); |
| } |
| |
| |
| /** |
| * @return deep copy of this attribute |
| */ |
| @Override |
| public Attribute copy( final ConstantPool _constant_pool ) { |
| final ExceptionTable c = (ExceptionTable) clone(); |
| if (exception_index_table != null) { |
| c.exception_index_table = new int[exception_index_table.length]; |
| System.arraycopy(exception_index_table, 0, c.exception_index_table, 0, |
| exception_index_table.length); |
| } |
| c.setConstantPool(_constant_pool); |
| return c; |
| } |
| } |