1/* 2 * Copyright (c) 2004, Oracle and/or its affiliates. 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. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26package sun.tools.jstat; 27 28import java.text.*; 29import 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 */ 38public 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} 64