64 lines
2.2 KiB
Java
64 lines
2.2 KiB
Java
/*
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* Copyright (c) 2004, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package sun.tools.jstat;
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import java.text.*;
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import sun.jvmstat.monitor.MonitorException;
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/**
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* A class implementing the Closure interface which is used to resolve
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* all the symbols in the expressions contained in ColumnFormat objects.
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*
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* @author Brian Doherty
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* @since 1.5
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*/
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public class SymbolResolutionClosure implements Closure {
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private static final boolean debug =
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Boolean.getBoolean("SymbolResolutionClosure.debug");
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private ExpressionEvaluator ee;
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public SymbolResolutionClosure(ExpressionEvaluator ee) {
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this.ee = ee;
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}
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public void visit(Object o, boolean hasNext) throws MonitorException {
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if (! (o instanceof ColumnFormat)) {
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return;
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}
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ColumnFormat c = (ColumnFormat)o;
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Expression e = c.getExpression();
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String previous = e.toString();
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e = (Expression)ee.evaluate(e);
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if (debug) {
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System.out.print("Expression: " + previous + " resolved to "
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+ e.toString());
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}
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c.setExpression(e);
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}
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}
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