/*
* reserved comment block
* DO NOT REMOVE OR ALTER!
*/
package com.sun.org.apache.bcel.internal.classfile;
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*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
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import com.sun.org.apache.bcel.internal.Constants;
import java.io.*;
/**
* 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 1.1.2.1 2005/07/31 23:46:29 jeffsuttor Exp $
* @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
* @see Code
*/
public final class ExceptionTable extends Attribute {
private int number_of_exceptions; // Table of indices into
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(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(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();
}
/**
* 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
*/
public void accept(Visitor v) {
v.visitExceptionTable(this);
}
/**
* Dump exceptions attribute to file stream in binary format.
*
* @param file Output file stream
* @throws IOException
*/
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]);
}
/**
* @return Array of indices into constant pool of thrown exceptions.
*/
public final int[] getExceptionIndexTable() {return exception_index_table;}
/**
* @return Length of exception table.
*/
public final int getNumberOfExceptions() { return number_of_exceptions; }
/**
* @return class names of thrown exceptions
*/
public final String[] getExceptionNames() {
String[] names = new String[number_of_exceptions];
for(int i=0; i < number_of_exceptions; i++)
names[i] = constant_pool.getConstantString(exception_index_table[i],
Constants.CONSTANT_Class).
replace('/', '.');
return names;
}
/**
* @param exception_index_table.
* 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.
*/
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
*/
public Attribute copy(ConstantPool constant_pool) {
ExceptionTable c = (ExceptionTable)clone();
c.exception_index_table = (int[])exception_index_table.clone();
c.constant_pool = constant_pool;
return c;
}
}