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/* |
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* Created on 27-May-2004 |
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* |
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* Variable.java is a part of WeightedMerge |
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* |
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* Copyright (C) 2004 Johan Enell, Dept Oncology, Lund University |
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* |
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* This program is free software; you can redistribute it and/or modify it under |
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* the terms of the GNU General Public License as published by the Free Software |
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* Foundation; either version 2 of the License, or (at your option) any later |
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* version. |
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* |
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* This program 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 FITNESS |
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* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more |
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* details. |
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* |
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* You should have received a copy of the GNU General Public License along with |
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* this program; if not, write to the Free Software Foundation, Inc., 59 Temple |
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* Place - Suite 330, Boston, MA 02111-1307, USA. |
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*/ |
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package qpackage.calculator; |
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|
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import java.util.HashMap; |
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import java.util.HashSet; |
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|
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/** |
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* A Variable is a dynamic Operand. When it is constucted it receives a name and |
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* it's value is set to <code>Float.NaN</code>. |
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* |
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* @author Johan Enell, johan.enell@onk.lu.se, Dept Oncology, Lund University, |
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* S-221 85 Lund, Sweden |
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*/ |
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public class Variable extends Operand |
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{ |
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|
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/** |
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* The name of this Variable. |
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*/ |
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private String name; |
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|
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/** |
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* Constructs a new Variable object with it's name set to value and it's |
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* value to Float.NaN. To set the value on this Variable use the |
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* <code>setVariable(Variable variable, float value)</code> method. |
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* |
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* @param value |
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*/ |
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protected Variable(String value) |
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{ |
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super(value); |
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name = value; |
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this.value = Float.NaN; |
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} |
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|
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/* |
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* (non-Javadoc) |
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* |
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* @see calc.Token#setVariable(calc.Variable, float) |
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*/ |
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@Override |
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protected void setVariable(Variable variable, float value) |
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{ |
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if (this.equals(variable)) this.value = value; |
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} |
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|
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/* |
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* (non-Javadoc) |
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* |
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* @see calc.Token#getVariables() |
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*/ |
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@Override |
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protected HashSet<Variable> getVariables() |
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{ |
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HashSet<Variable> ret = new HashSet<Variable>(); |
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ret.add(this); |
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return ret; |
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} |
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|
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/* |
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* (non-Javadoc) |
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* |
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* @see calc.Token#getValue() |
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*/ |
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@Override |
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protected float getValue() |
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{ |
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return value; |
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} |
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|
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/** |
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* Gets the name of this Variable. |
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* |
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* @return the name of this Variable. |
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*/ |
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public String getName() |
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{ |
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return name; |
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} |
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|
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/** |
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* Returns a string representation of this Variable. The string |
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* representation of an Variable is the name. |
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* |
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* @return a string representation of this Variable. |
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* |
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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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{ |
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return this.name; |
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} |
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|
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/** |
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* Compares the specified object with this Variable for equality. Returnes |
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* <code>true</code> if the specified object is also a Variable and the |
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* name of the two objects are equal. |
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* |
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* @return <code>true</code> if the specified object is equal to this |
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* Variable. |
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* |
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* @see java.lang.Object#equals(java.lang.Object) |
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*/ |
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@Override |
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public boolean equals(Object obj) |
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{ |
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if (obj instanceof Variable) return this.getName().equals(((Variable) obj).getName()); |
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return super.equals(obj); |
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} |
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|
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/** |
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* Returns the hash code value for this Variable. The hash code is defined |
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* as the hash code for the name as it is specifid in String.hashCode(). |
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* This ensures that <code>v1.equals(v2)</code> implies that |
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* <code>v1.hashCode() == v2.hashCode()</code> for any two Variables |
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* <code>v1</code> and <code>v2</code>, as required by the general |
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* contract of Object.hashCode. |
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* |
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* @return the hash code value of this Operand. |
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* |
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* @see java.lang.Object#hashCode() |
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* @see java.lang.String#hashCode() |
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*/ |
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@Override |
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public int hashCode() |
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{ |
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return name.hashCode(); |
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} |
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|
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/* |
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* (non-Javadoc) |
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* |
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* @see calc.Token#getValue(java.util.HashMap) |
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*/ |
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@Override |
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protected float getValue(HashMap variables) |
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{ |
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Double value = (Double) variables.get(this); |
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if (value != null) this.value = value.floatValue(); |
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else this.value = Float.NaN; |
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|
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return this.value; |
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} |
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} |