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/*
* 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.bcel.classfile;
import java.io.DataInput;
import java.io.DataOutputStream;
import java.io.IOException;
import org.apache.bcel.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).
*
* @version $Id$
* @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 final 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 final int[] getExceptionIndexTable() {
return exception_index_table;
}
/**
* @return Length of exception table.
*/
public final int getNumberOfExceptions() {
return exception_index_table == null ? 0 : exception_index_table.length;
}
/**
* @return class names of thrown exceptions
*/
public final 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 final 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 final 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;
}
}
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