/*
* Copyright (c) 2004, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code 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. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code 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 in the LICENSE file that
* accompanied this code).
*
* 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package sun.tools.jstat;
import java.text.*;
import sun.jvmstat.monitor.MonitorException;
/**
* A class implementing the Closure interface which is used to resolve
* all the symbols in the expressions contained in ColumnFormat objects.
*
* @author Brian Doherty
* @since 1.5
*/
public class SymbolResolutionClosure implements Closure {
private static final boolean debug =
Boolean.getBoolean("SymbolResolutionClosure.debug");
private ExpressionEvaluator ee;
public SymbolResolutionClosure(ExpressionEvaluator ee) {
this.ee = ee;
}
public void visit(Object o, boolean hasNext) throws MonitorException {
if (! (o instanceof ColumnFormat)) {
return;
}
ColumnFormat c = (ColumnFormat)o;
Expression e = c.getExpression();
String previous = e.toString();
e = (Expression)ee.evaluate(e);
if (debug) {
System.out.print("Expression: " + previous + " resolved to "
+ e.toString());
}
c.setExpression(e);
}
}