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130 lines
3.2 KiB
Java
130 lines
3.2 KiB
Java
/**
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* Copyright 2006 Bertoli Marco
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.gamingmesh.jobs.resources.jfep;
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/**
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* <p><b>Name:</b> VariableNode</p>
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* <p><b>Description:</b>
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* A node holding a double variable.
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* </p>
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* <p><b>Date:</b> 08/dic/06
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* <b>Time:</b> 15:56:59</p>
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* @author Bertoli Marco
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* @version 1.0
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*/
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public class VariableNode implements ExpressionNode {
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/** Value of the variable */
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protected double value;
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/** True if variable was not initialized */
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protected boolean error;
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/** Name of the variable */
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protected String name;
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/** An empty array with children */
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protected ExpressionNode[] children = new ExpressionNode[0];
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/**
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* Creates a new variable node with given name.
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* @param name name of the variable
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* @param error throws an exception if value is get but variable
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* is not initialized. Otherwise 0.0 is returned.
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*/
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public VariableNode(String name, boolean error) {
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this.name = name;
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value = 0.0;
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this.error = error;
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}
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/* (non-Javadoc)
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* @see jmt.engine.math.parser.ExpressionNode#count()
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*/
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@Override
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public int count() {
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return 1;
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}
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/* (non-Javadoc)
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* @see jmt.engine.math.parser.ExpressionNode#getDepth()
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*/
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@Override
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public int getDepth() {
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return 1; // This is a leaf node
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}
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/* (non-Javadoc)
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* @see jmt.engine.math.parser.ExpressionNode#getSubtype()
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*/
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@Override
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public String getSubtype() {
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return name;
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}
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/* (non-Javadoc)
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* @see jmt.engine.math.parser.ExpressionNode#getType()
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*/
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@Override
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public int getType() {
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return ExpressionNode.VARIABLE_NODE;
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}
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/* (non-Javadoc)
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* @see jmt.engine.math.parser.ExpressionNode#getValue()
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*/
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@Override
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public double getValue() {
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if (!error)
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return value;
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throw new EvaluationException("Variable '" + name + "' was not initialized.");
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}
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/* (non-Javadoc)
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* @see jmt.engine.math.parser.ExpressionNode#setVariable(java.lang.String, double)
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*/
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@Override
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public void setVariable(String name, double value) {
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if (this.name.equals(name)) {
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this.value = value;
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error = false;
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}
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}
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/* (non-Javadoc)
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* @see org.mbertoli.jfep.ExpressionNode#getChildrenNodes()
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*/
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@Override
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public ExpressionNode[] getChildrenNodes() {
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return children;
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}
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/* (non-Javadoc)
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* @see java.lang.Object#clone()
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*/
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@Override
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public Object clone() {
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VariableNode node = new VariableNode(name, error);
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node.value = value;
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return node;
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}
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/* (non-Javadoc)
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* @see java.lang.Object#toString()
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*/
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@Override
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public String toString() {
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return getSubtype();
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}
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}
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