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/* |
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* Created on 26-May-2004 |
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* |
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* Operator.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 Operator is a Token that calculates it's value using two Operands or other |
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* Operators. |
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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 Operator extends Token |
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{ |
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|
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/** |
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* The first Token in this Operator. |
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*/ |
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protected Token tok1 = null; |
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|
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/** |
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* The second Token in this Operator. |
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*/ |
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protected Token tok2 = null; |
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|
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/** |
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* The character for this Operator. |
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*/ |
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protected String character; |
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|
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/** |
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* The order of this Operator. The Operator with the lowest order will be |
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* valculated last in an equation. |
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*/ |
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protected int order; |
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|
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/** |
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* Construct a new empty Operator. |
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*/ |
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protected Operator() |
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{ |
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super(); |
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} |
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|
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/** |
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* Constructs a new Operator with the Tokens tok1 and tok2. It sets the |
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* character to <code>""</code> and the order to 0. |
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* |
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* @param tok1 |
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* the first Token. |
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* @param tok2 |
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* the second Token. |
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*/ |
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protected Operator(Token tok1, Token tok2) |
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{ |
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this.tok1 = tok1; |
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this.tok2 = tok2; |
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this.character = ""; |
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this.order = 0; |
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} |
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|
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/** |
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* Constructs a new Operator with the two Tokens as null and with order 0. |
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* |
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* @param character |
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* the character of this Operator. |
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*/ |
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protected Operator(String character) |
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{ |
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this.tok1 = null; |
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this.tok2 = null; |
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this.character = character; |
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this.order = 0; |
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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 (tok1 != null) tok1.setVariable(variable, value); |
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if (tok2 != null) tok2.setVariable(variable, value); |
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} |
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|
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/** |
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* Returns a string representation of this Operator. The string |
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* representation consistis of the string representation of the first Token |
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* followed by the character of the Token and finally the string |
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* representation of the last Operator. If the order of this Operator is |
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* greater than 3 it is encapsulated by parenthesis. If any of the Token is |
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* null the string "null" is printed instead. |
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* |
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* @return a string representation of this Operator. |
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*/ |
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@Override |
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public String toString() |
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{ |
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String ret = ""; |
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|
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ret += (tok1 == null ? "null" : tok1.toString()); |
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ret += this.character; |
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ret += (tok2 == null ? "null" : tok2.toString()); |
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if (this.order > 3) ret = "(" + ret + ")"; |
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return ret; |
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} |
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|
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/** |
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* Compares the specified object with this Operator for equality. Returns |
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* <code>true</code> if the specifies object is also an Operator, the |
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* Tokens in the two Operators are equal, and the character for the two |
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* Operators are the same. |
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* |
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* @return <code>true</code> if the specified object is equal this |
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* Operator. |
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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 Operator) |
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{ |
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boolean ret; |
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if (this.tok1 == null) ret = ((Operator) obj).tok1 == null; |
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else ret = this.tok1.equals(((Operator) obj).tok1); |
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ret &= this.character == ((Operator) obj).character; |
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if (this.tok2 == null) ret &= ((Operator) obj).tok2 == null; |
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else ret &= this.tok2.equals(((Operator) obj).tok2); |
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return ret; |
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} |
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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 sum of the hash codes of the two Tokens plus the hash code for the |
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* character. This ensures that <code>o1.equals(o2)</code> implies that |
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* <code>o1.hashCode() == o2.hashCode()</code> for any two Operators |
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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 Operator. |
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*/ |
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@Override |
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public int hashCode() |
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{ |
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int ret; |
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|
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ret = tok1.hashCode(); |
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ret += this.character.hashCode(); |
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ret += tok2.hashCode(); |
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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#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.addAll(tok1.getVariables()); |
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ret.addAll(tok2.getVariables()); |
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return ret; |
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} |
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|
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/** |
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* Sets the first Token of this Operator object. |
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* |
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* @param tok1 |
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* the given new Token. |
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*/ |
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protected void setTok1(Token tok1) |
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{ |
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this.tok1 = tok1; |
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} |
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|
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/** |
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* Sets the second Token of this Operator object. |
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* |
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* @param tok2 |
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* the given new Token. |
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*/ |
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protected void setTok2(Token tok2) |
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{ |
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this.tok2 = tok2; |
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} |
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|
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/** |
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* Gets the oreder of this Operator. |
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* |
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* @return the oreder of this Operator. |
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*/ |
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protected int getOrder() |
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{ |
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return order; |
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} |
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|
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/** |
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* Increases the order parameter with the given parameter, |
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* <code>this.order += inc;</code>. |
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* |
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* @param inc |
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* how much the order while increas, a negative value will |
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* decrease the order. |
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*/ |
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protected void addOrder(int inc) |
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{ |
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this.order += inc; |
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} |
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} |