| /* |
| * 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 org.apache.tomcat.util.bcel.classfile; |
| |
| import java.io.DataInputStream; |
| import java.io.DataOutputStream; |
| import java.io.IOException; |
| |
| import org.apache.tomcat.util.bcel.Constants; |
| |
| /** |
| * 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). |
| * |
| * @version $Id: ExceptionTable.java,v 1.1 2011/06/28 21:08:23 rherrmann Exp $ |
| * @author <A HREF="mailto:m.dahm@gmx.de">M. Dahm</A> |
| * @see Code |
| */ |
| public final class ExceptionTable extends Attribute { |
| |
| private static final long serialVersionUID = -5109672682663772900L; |
| private int number_of_exceptions; // Table of indices into |
| private int[] exception_index_table; // constant pool |
| |
| |
| /** |
| * @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(int name_index, int length, int[] exception_index_table, |
| ConstantPool constant_pool) { |
| super(Constants.ATTR_EXCEPTIONS, name_index, length, constant_pool); |
| setExceptionIndexTable(exception_index_table); |
| } |
| |
| |
| /** |
| * Construct object from file stream. |
| * @param name_index Index in constant pool |
| * @param length Content length in bytes |
| * @param file Input stream |
| * @param constant_pool Array of constants |
| * @throws IOException |
| */ |
| ExceptionTable(int name_index, int length, DataInputStream file, ConstantPool constant_pool) |
| throws IOException { |
| this(name_index, length, (int[]) null, constant_pool); |
| number_of_exceptions = file.readUnsignedShort(); |
| exception_index_table = new int[number_of_exceptions]; |
| for (int i = 0; i < number_of_exceptions; i++) { |
| exception_index_table[i] = file.readUnsignedShort(); |
| } |
| } |
| |
| |
| /** |
| * Dump exceptions attribute to file stream in binary format. |
| * |
| * @param file Output file stream |
| * @throws IOException |
| */ |
| @Override |
| public final void dump( DataOutputStream file ) throws IOException { |
| super.dump(file); |
| file.writeShort(number_of_exceptions); |
| for (int i = 0; i < number_of_exceptions; i++) { |
| file.writeShort(exception_index_table[i]); |
| } |
| } |
| |
| |
| /** |
| * @param exception_index_table the list of exception indexes |
| * Also redefines number_of_exceptions according to table length. |
| */ |
| public final void setExceptionIndexTable( int[] exception_index_table ) { |
| this.exception_index_table = exception_index_table; |
| number_of_exceptions = (exception_index_table == null) ? 0 : exception_index_table.length; |
| } |
| |
| |
| /** |
| * @return String representation, i.e., a list of thrown exceptions. |
| */ |
| @Override |
| public final String toString() { |
| StringBuffer buf = new StringBuffer(); |
| String str; |
| for (int i = 0; i < number_of_exceptions; i++) { |
| str = constant_pool.getConstantString(exception_index_table[i], |
| Constants.CONSTANT_Class); |
| buf.append(Utility.compactClassName(str, false)); |
| if (i < number_of_exceptions - 1) { |
| buf.append(", "); |
| } |
| } |
| return buf.toString(); |
| } |
| |
| |
| /** |
| * @return deep copy of this attribute |
| */ |
| @Override |
| public Attribute copy( ConstantPool _constant_pool ) { |
| 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.constant_pool = _constant_pool; |
| return c; |
| } |
| } |