| J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2004 Sun Microsystems, Inc. All Rights Reserved. |
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 | * |
| 5 | * This code is free software; you can redistribute it and/or modify it |
| 6 | * under the terms of the GNU General Public License version 2 only, as |
| 7 | * published by the Free Software Foundation. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun in the LICENSE file that accompanied this code. |
| 10 | * |
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 14 | * version 2 for more details (a copy is included in the LICENSE file that |
| 15 | * accompanied this code). |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License version |
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, |
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 20 | * |
| 21 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any questions. |
| 24 | */ |
| 25 | |
| 26 | package sun.tools.jstat; |
| 27 | |
| 28 | import java.text.*; |
| 29 | import sun.jvmstat.monitor.MonitorException; |
| 30 | |
| 31 | /** |
| 32 | * A class implementing the Closure interface which is used to resolve |
| 33 | * all the symbols in the expressions contained in ColumnFormat objects. |
| 34 | * |
| 35 | * @author Brian Doherty |
| 36 | * @since 1.5 |
| 37 | */ |
| 38 | public class SymbolResolutionClosure implements Closure { |
| 39 | private static final boolean debug = |
| 40 | Boolean.getBoolean("SymbolResolutionClosure.debug"); |
| 41 | |
| 42 | private ExpressionEvaluator ee; |
| 43 | |
| 44 | public SymbolResolutionClosure(ExpressionEvaluator ee) { |
| 45 | this.ee = ee; |
| 46 | } |
| 47 | |
| 48 | public void visit(Object o, boolean hasNext) throws MonitorException { |
| 49 | if (! (o instanceof ColumnFormat)) { |
| 50 | return; |
| 51 | } |
| 52 | |
| 53 | ColumnFormat c = (ColumnFormat)o; |
| 54 | Expression e = c.getExpression(); |
| 55 | String previous = e.toString(); |
| 56 | e = (Expression)ee.evaluate(e); |
| 57 | if (debug) { |
| 58 | System.out.print("Expression: " + previous + " resolved to " |
| 59 | + e.toString()); |
| 60 | } |
| 61 | c.setExpression(e); |
| 62 | } |
| 63 | } |