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/* |
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* Created on 26-May-2004 |
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* |
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* Operand.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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import java.util.HashSet; |
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|
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/** |
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* An Opreand is a Token that holds a value. It holds the value in te field |
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* <code>value</code>. If for som reason the Operand dosen't has a value the |
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* fields is equal 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 abstract class Operand extends Token |
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{ |
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|
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/** |
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* The float value of this Object. |
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*/ |
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protected float value; |
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|
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/** |
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* Constructa a new Operand with the float value value. |
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* |
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* @param value |
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* the value of this Operand. |
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*/ |
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protected Operand(float value) |
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{ |
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this.value = value; |
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} |
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|
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/** |
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* Constructs a new Oprand using a String to retrive the value. |
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* |
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* @param value |
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*/ |
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protected Operand(String 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#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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|
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@Override |
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protected HashSet<Variable> getVariables() |
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{ |
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return new HashSet<Variable>(); |
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} |
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|
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/** |
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* Returns a string representation of this Operand. The string |
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* representation of an Operand is the string representation of it's float |
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* value. |
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* |
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* @return a string representation of this Operand. |
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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 String.valueOf(value); |
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} |
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|
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/** |
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* Compares the specified object with this Operand for equality. Returnes |
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* <code>true</code> if the specified object is also an Operand and the |
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* float value 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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* Operand. |
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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 Operand) return this.getValue() == ((Token) obj).getValue(); |
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return false; |
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} |
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|
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/** |
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* Returns the hash code value for this Operator. The hash code is defined |
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* as the hash code for the value as it is specifid in Float.hashCode(). |
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* This ensures that <code>o1.equals(o2)</code> implies that |
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* <code>o1.hashCode() == o2.hashCode()</code> for any two Operands |
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* <code>o1</code> and <code>o2</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.Float#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 new Float(this.getValue()).hashCode(); |
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} |
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} |