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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 | +} | |