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| 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 | |||
| 26 | package sun.tools.jstat; | ||
| 27 | |||
| 28 | /** | ||
| 29 | * A class that represents a mathematical expression as a tree structure | ||
| 30 | * containing operators as interior nodes and operands as leaves. The | ||
| 31 | * operands can be literals or lazily bound variables. | ||
| 32 | * | ||
| 33 | * @author Brian Doherty | ||
| 34 | * @since 1.5 | ||
| 35 | */ | ||
| 36 | public class Expression { | ||
| 37 | private static int nextOrdinal; | ||
| 38 | private boolean debug = Boolean.getBoolean("Expression.debug"); | ||
| 39 | private Expression left; | ||
| 40 | private Expression right; | ||
| 41 | private Operator operator; | ||
| 42 | private int ordinal = nextOrdinal++; | ||
| 43 | |||
| 44 | Expression() { | ||
| 45 | if (debug) { | ||
| 46 | System.out.println("Expression " + ordinal + " created"); | ||
| 47 | } | ||
| 48 | } | ||
| 49 | |||
| 50 | void setLeft(Expression left) { | ||
| 51 | if (debug) { | ||
| 52 | System.out.println("Setting left on " + ordinal + " to " + left); | ||
| 53 | } | ||
| 54 | this.left = left; | ||
| 55 | } | ||
| 56 | |||
| 57 | Expression getLeft() { | ||
| 58 | return left; | ||
| 59 | } | ||
| 60 | |||
| 61 | void setRight(Expression right) { | ||
| 62 | if (debug) { | ||
| 63 | System.out.println("Setting right on " + ordinal + " to " + right); | ||
| 64 | } | ||
| 65 | this.right = right; | ||
| 66 | } | ||
| 67 | |||
| 68 | Expression getRight() { | ||
| 69 | return right; | ||
| 70 | } | ||
| 71 | |||
| 72 | void setOperator(Operator o) { | ||
| 73 | if (debug) { | ||
| 74 | System.out.println("Setting operator on " + ordinal + " to " + o); | ||
| 75 | } | ||
| 76 | this.operator = o; | ||
| 77 | } | ||
| 78 | |||
| 79 | Operator getOperator() { | ||
| 80 | return operator; | ||
| 81 | } | ||
| 82 | |||
| 83 | public String toString() { | ||
| 84 | StringBuilder b = new StringBuilder(); | ||
| 85 | b.append('('); | ||
| 86 | if (left != null) { | ||
| 87 | b.append(left.toString()); | ||
| 88 | } | ||
| 89 | if (operator != null) { | ||
| 90 | b.append(operator.toString()); | ||
| 91 | if (right != null) { | ||
| 92 | b.append(right.toString()); | ||
| 93 | } | ||
| 94 | } | ||
| 95 | b.append(')'); | ||
| 96 | return b.toString(); | ||
| 97 | } | ||
| 98 | } | ||