0N/A/*
2362N/A * Copyright (c) 2004, Oracle and/or its affiliates. All rights reserved.
0N/A * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
0N/A *
0N/A * This code is free software; you can redistribute it and/or modify it
0N/A * under the terms of the GNU General Public License version 2 only, as
2362N/A * published by the Free Software Foundation. Oracle designates this
0N/A * particular file as subject to the "Classpath" exception as provided
2362N/A * by Oracle in the LICENSE file that accompanied this code.
0N/A *
0N/A * This code is distributed in the hope that it will be useful, but WITHOUT
0N/A * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
0N/A * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
0N/A * version 2 for more details (a copy is included in the LICENSE file that
0N/A * accompanied this code).
0N/A *
0N/A * You should have received a copy of the GNU General Public License version
0N/A * 2 along with this work; if not, write to the Free Software Foundation,
0N/A * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
0N/A *
2362N/A * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
2362N/A * or visit www.oracle.com if you need additional information or have any
2362N/A * questions.
0N/A */
0N/A
0N/Apackage sun.tools.jstat;
0N/A
0N/A/**
0N/A * A class that represents a mathematical expression as a tree structure
0N/A * containing operators as interior nodes and operands as leaves. The
0N/A * operands can be literals or lazily bound variables.
0N/A *
0N/A * @author Brian Doherty
0N/A * @since 1.5
0N/A */
0N/Apublic class Expression {
0N/A private static int nextOrdinal;
0N/A private boolean debug = Boolean.getBoolean("Expression.debug");
0N/A private Expression left;
0N/A private Expression right;
0N/A private Operator operator;
0N/A private int ordinal = nextOrdinal++;
0N/A
0N/A Expression() {
0N/A if (debug) {
0N/A System.out.println("Expression " + ordinal + " created");
0N/A }
0N/A }
0N/A
0N/A void setLeft(Expression left) {
0N/A if (debug) {
0N/A System.out.println("Setting left on " + ordinal + " to " + left);
0N/A }
0N/A this.left = left;
0N/A }
0N/A
0N/A Expression getLeft() {
0N/A return left;
0N/A }
0N/A
0N/A void setRight(Expression right) {
0N/A if (debug) {
0N/A System.out.println("Setting right on " + ordinal + " to " + right);
0N/A }
0N/A this.right = right;
0N/A }
0N/A
0N/A Expression getRight() {
0N/A return right;
0N/A }
0N/A
0N/A void setOperator(Operator o) {
0N/A if (debug) {
0N/A System.out.println("Setting operator on " + ordinal + " to " + o);
0N/A }
0N/A this.operator = o;
0N/A }
0N/A
0N/A Operator getOperator() {
0N/A return operator;
0N/A }
0N/A
0N/A public String toString() {
0N/A StringBuilder b = new StringBuilder();
0N/A b.append('(');
0N/A if (left != null) {
0N/A b.append(left.toString());
0N/A }
0N/A if (operator != null) {
0N/A b.append(operator.toString());
0N/A if (right != null) {
0N/A b.append(right.toString());
0N/A }
0N/A }
0N/A b.append(')');
0N/A return b.toString();
0N/A }
0N/A}