/*
* @(#)ExceptionsAttribute.java 1.14 06/10/10
*
* Copyright 1990-2008 Sun Microsystems, Inc. All Rights Reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version
* 2 only, as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License version 2 for more details (a copy is
* included at /legal/license.txt).
*
* You should have received a copy of the GNU General Public License
* version 2 along with this work; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
* Clara, CA 95054 or visit www.sun.com if you need additional
* information or have any questions.
*
*/
package components;
import java.io.DataOutput;
import java.io.DataInput;
import java.io.IOException;
import util.*;
/*
* A class to represent the Exceptions table Attribute
* of a method
*/
public
class ExceptionsAttribute extends Attribute
{
public ClassConstant data[];
public
ExceptionsAttribute( UnicodeConstant name, int l, ClassConstant d[] ){
super( name, l );
data = d;
}
public void
countConstantReferences( boolean isRelocatable ){
super.countConstantReferences( isRelocatable );
int n = data.length;
for ( int i = 0; i < n; i++ ){
data[i].incReference();
}
}
/*
* This method can only be called at the very end of processing,
* just before output writing. We call super.validate to make
* sure that the UnicodeConstant that is the attribute name
* is not in the constant pool.
* Then we validate all the ClassConstants in the attribute, to make
* sure that they're all in a constant pool.
*/
public void
validate(){
super.validate();
int n = data.length;
for ( int i = 0; i < n; i++ ){
data[i].validate();
}
}
protected int
writeData( DataOutput o ) throws IOException{
int n = data.length;
o.writeShort( n );
for ( int i = 0; i < n; i++ ){
o.writeShort( data[i].index );
// debug
if ( data[i].index <= 0 ){
System.err.println(Localizer.getString("exceptionsattribute.exceptions_table_references_negative_subscript", data[i]));
}
// end debug
}
return 2 + 2*n;
}
//
// for those cases where we already read the name index
// and know that its not something requiring special handling.
//
public static Attribute
finishReadAttribute( DataInput in, UnicodeConstant name, ConstantPool cp ) throws IOException {
int l;
int n;
ClassConstant d[];
l = in.readInt();
n = in.readUnsignedShort();
d = new ClassConstant[ n ];
ConstantObject[] t = cp.getConstants();
for ( int i = 0; i < n; i++ ){
int index = in.readUnsignedShort();
d[i] = (ClassConstant)t[ index ];
}
return new ExceptionsAttribute( name, l, d );
}
}