author | vlivanov |
Fri, 26 May 2017 18:39:27 +0300 (2017-05-26) | |
changeset 48557 | 2e867226b914 |
parent 48121 | 1fe261257e81 |
child 49891 | 61b0342b5711 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2004, 2010, 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 sun.jvmstat.monitor.*; |
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/** |
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* A class implementing the ExpressionEvaluator to resolve unresolved |
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* symbols in an Expression in the context of the available monitoring data. |
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* This class also performs some minimal optimizations of the expressions, |
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* such as simplification of constant subexpressions. |
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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 ExpressionResolver implements ExpressionEvaluator { |
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private static boolean debug = Boolean.getBoolean("ExpressionResolver.debug"); |
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private MonitoredVm vm; |
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ExpressionResolver(MonitoredVm vm) { |
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this.vm = vm; |
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} |
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/* |
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* evaluate the given expression. evaluation in this case means |
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* to resolve the counter names in the expression |
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*/ |
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public Object evaluate(Expression e) throws MonitorException { |
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if (e == null) { |
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return null; |
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} |
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if (debug) { |
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System.out.println("Resolving Expression:" + e); |
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} |
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if (e instanceof Identifier) { |
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Identifier id = (Identifier)e; |
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// check if it's already resolved |
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if (id.isResolved()) { |
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return id; |
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} |
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// look it up |
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Monitor m = vm.findByName(id.getName()); |
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if (m == null) { |
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if (debug) { |
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System.err.println("Warning: Unresolved Symbol: " |
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+ id.getName() + " substituted NaN"); |
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} |
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return new Literal(Double.valueOf(Double.NaN)); |
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} |
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if (m.getVariability() == Variability.CONSTANT) { |
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if (debug) { |
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System.out.println("Converting constant " + id.getName() |
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+ " to literal with value " |
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+ m.getValue()); |
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} |
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return new Literal(m.getValue()); |
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} |
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id.setValue(m); |
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return id; |
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} |
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if (e instanceof Literal) { |
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return e; |
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} |
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Expression l = null; |
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Expression r = null; |
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if (e.getLeft() != null) { |
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l = (Expression)evaluate(e.getLeft()); |
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} |
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if (e.getRight() != null) { |
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r = (Expression)evaluate(e.getRight()); |
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} |
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if (l != null && r != null) { |
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if ((l instanceof Literal) && (r instanceof Literal)) { |
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Literal ll = (Literal)l; |
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Literal rl = (Literal)r; |
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boolean warn = false; |
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Double nan = Double.valueOf(Double.NaN); |
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if (ll.getValue() instanceof String) { |
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warn = true; ll.setValue(nan); |
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} |
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if (rl.getValue() instanceof String) { |
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warn = true; rl.setValue(nan); |
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} |
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if (debug && warn) { |
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System.out.println("Warning: String literal in " |
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+ "numerical expression: " |
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+ "substitutied NaN"); |
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} |
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// perform the operation |
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Number ln = (Number)ll.getValue(); |
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Number rn = (Number)rl.getValue(); |
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double result = e.getOperator().eval(ln.doubleValue(), |
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rn.doubleValue()); |
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if (debug) { |
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System.out.println("Converting expression " + e |
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+ " (left = " + ln.doubleValue() + ")" |
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+ " (right = " + rn.doubleValue() + ")" |
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+ " to literal value " + result); |
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} |
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return new Literal(Double.valueOf(result)); |
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} |
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} |
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if (l != null && r == null) { |
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return l; |
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} |
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e.setLeft(l); |
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e.setRight(r); |
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return e; |
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} |
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} |