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/* * 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);    }}