/*
* Copyright (C) 2011 Alasdair C. Hamilton
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>
*/
package ket.math;
import java.awt.*; // Why?
import java.util.*;
import ket.display.*;
import ket.display.box.Box;
import ket.display.box.BoxWord;
import ket.display.box.BoxTools;
import ket.math.purpose.function.*;
import ket.math.purpose.SymbolicState;
import ket.math.purpose.symbolicFunctions.*;
import ketUI.Ket;
/**
* This is an example of the builder design pattern for SymbolicFunction. It
* is in Function.java because this is where constants are defined.
*/
public class SymbolicFunctionBuilder {
final String name;
final int[] numberOfChildren;
final int precedence;
SymbolicState prefix;
SymbolicState infix;
SymbolicState postfix;
boolean hasBranckets;
SymbolicFunctionForm form;
public SymbolicFunctionBuilder(String name, int[] numberOfChildren, int precedence) {
this.name = name;
this.numberOfChildren = numberOfChildren;
this.precedence = precedence;
SymbolicState prefix = null;
SymbolicState infix = null;
SymbolicState postfix = null;
boolean hasBranckets = false; // <--- This is only used for '?'; it could generalize, but may be simpler to remove for now.
form = null; // Ensure this is not null before use.
}
public SymbolicFunctionBuilder setPrefix(SymbolicState prefix) {
this.prefix = prefix;
return this;
}
public SymbolicFunctionBuilder setInfix(SymbolicState infix) {
this.infix = infix;
return this;
}
public SymbolicFunctionBuilder setPostfix(SymbolicState postfix) {
this.postfix = postfix;
return this;
}
public SymbolicFunctionBuilder setShowBrackets() {
this.hasBranckets = true;
return this;
}
public SymbolicFunctionBuilder setForm(SymbolicFunctionForm form) {
this.form = form;
return this;
}
public SymbolicFunction build() {
if (prefix==null && infix==null && postfix==null) {
Ket.out.println(" !!! Invalid function: no prefix, infix or postfix specified !!! ");
return null;
}
return new SymbolicFunction(name, numberOfChildren, precedence, prefix, infix, postfix, hasBranckets, form);
}
}