/*
* @(#)UnicodeConstant.java 1.13 06/10/21
*
* 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.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import consts.Const;
import util.ValidationException;
import jcc.Util;
// Class that represents a CONSTANT_UTF8 in a classfile's
// constant pool
public
class UnicodeConstant extends ConstantObject
{
public String string;
private String UTFstring;
public int stringTableOffset; // used by in-core output writers
public boolean isSuffix = false; // used by in-core output writers
public UnicodeConstant(String s) {
super(Const.CONSTANT_UTF8);
string = s;
}
/**
* Factory method to construct a UnicodeConstant instance from the
* constant pool data stream. This method is only called from the
* ConstantObject.readObject() factory.
*/
static ConstantObject read(DataInput i) throws IOException {
return new UnicodeConstant(i.readUTF());
}
public void write( DataOutput o ) throws IOException{
o.writeByte( tag );
o.writeUTF( string );
}
public int hashCode() {
return string.hashCode();
}
public void incReference() {
Throwable t;
super.incReference();
t = new Error();
System.err.println("UnicodeConstant.incReference() at ");
t.printStackTrace();
System.err.println();
}
public boolean equals(Object o) {
if (o instanceof UnicodeConstant) {
UnicodeConstant a = (UnicodeConstant) o;
return string.equals(a.string);
} else {
return false;
}
}
/*
* This method can only be called at the very end of processing,
* just before output writing. Unlike all other constants,
* UnicodeConstants still exist, but are not expected to be found
* in any constant pool. Their reference counts must all be 0.
* Their index must be -1, and they must not appear in a shared ConstantPool.
* Because of these different requirements, we cannot call super.validate() here.
* (Note: even if the above is wrong, their ldcReferences must always
* be zero, as no instructions are allowed to refer to them directly!)
* If any constraint is violated, throw a ValidationException.
* This should stop processing and print a backtrace to the offender.
*/
public void validate(){
if ((getReferences() != 0) || (getLdcReferences() != 0)) {
throw new ValidationException("Referenced UnicodeConstant", this);
}
if (index != -1){
throw new ValidationException("UnicodeConstant with index not -1", this);
}
if (shared){
throw new ValidationException("UnicodeConstant marked shared", this);
}
}
public String toString() {
return string;
}
public void createUTF() {
if (UTFstring == null ){
UTFstring = Util.unicodeToUTF( string );
}
}
public String toUTF() {
if (UTFstring == null ){
UTFstring = Util.unicodeToUTF( string );
}
return UTFstring;
}
public String getUTF() {
return UTFstring;
}
public boolean isResolved(){ return true; }
}