Package parser

Class Variable

java.lang.Object
parser.Variable
All Implemented Interfaces:
Savable, java.io.Serializable
public class Variable
extends java.lang.Object
implements Savable
Author:
GBENRO template for modeling/creating variable objects
See Also:
Serialized Form

  • Field Summary

    Fields
    Modifier and Type Field Description
    static Variable ans
    The last answer variable used for flexibility on computational systems.
    static Variable e  
    static Variable PI
    The constant PI

  • Constructor Summary

    Constructors
    Constructor Description
    Variable​(java.lang.String name)  
    Variable​(java.lang.String name, double value, boolean constant)  
    Variable​(java.lang.String name, java.lang.String value, boolean constant)  
    Variable​(java.lang.String name, java.lang.String fullName, java.lang.String value, boolean constant)  

  • Method Summary

    Modifier and Type Method Description
    boolean equals​(java.lang.Object obj)  
    java.lang.String getFullName()  
    java.lang.String getName()  
    int getSimpleVarIndex()  
    static int getSimpleVarIndex​(java.lang.String var)  
    static java.lang.String getSystemConstantValue​(java.lang.String name)  
    TYPE getType()  
    java.lang.String getUnits()  
    java.lang.String getValue()
    returns the value of the variable
    boolean isConstant()  
    static boolean isExpNumber​(java.lang.String str)  
    static boolean isLastEvaluatedAnswer​(java.lang.String str)  
    static boolean isPI​(java.lang.String str)  
    boolean isSimpleVar()  
    static boolean isSystemConstant​(java.lang.String str)  
    static boolean isSystemVar​(java.lang.String str)  
    boolean isTheta()  
    static boolean isTheta​(java.lang.String str)  
    static boolean isVariableBeginner​(java.lang.String var)  
    static boolean isVariableBuilder​(java.lang.String unit)  
    static boolean isVariableString​(java.lang.String var)
    If the name is a string of alphabets and is not an operator name, then it is a valid variable name.
    static void main​(java.lang.String[] args)  
    static Variable parse​(java.lang.String enc)  
    java.lang.String serialize()  
    void setConstant​(boolean constant)
    sets the nature of the Variable object to either Variable or constant
    void setFullName​(java.lang.String fullName)  
    void setName​(java.lang.String name)  
    void setType​(TYPE type)  
    void setUnits​(java.lang.String units)  
    void setValue​(java.lang.String value)
    changes the value stored in the variable
    java.lang.String toString()  

    Methods inherited from class java.lang.Object

    clone, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

  • Field Details

    • PI

      public static final Variable PI
      The constant PI

    • ans

      public static Variable ans
      The last answer variable used for flexibility on computational systems.

    • e

      public static Variable e

  • Constructor Details

    • Variable

      public Variable​(java.lang.String name)

    • Variable

      public Variable​(java.lang.String name, java.lang.String value, boolean constant)
      Parameters:
      name - the name of the Variable object e.g A,B...e.t.c
      value - the value stored by the Variable object
      constant - the nature of the Variable object whether it is modifiable or not. If constant = true , then the Variable object represents a constant, whose value cannot be altered.Else,it represents a Variable object whose value can change.

    • Variable

      public Variable​(java.lang.String name, java.lang.String fullName, java.lang.String value, boolean constant)
      Parameters:
      name - the name of the Variable object e.g A,B...e.t.c
      fullName - the full name of the Variable object
      value - the value stored by the Variable object
      constant - the nature of the Variable object whether it is modifiable or not. If constant = true , then the Variable object represents a constant, whose value cannot be altered.Else,it represents a Variable object whose value can change.

    • Variable

      public Variable​(java.lang.String name, double value, boolean constant)
      Parameters:
      name - the name of the Variable object e.g A,B...e.t.c
      value - the value stored by the Variable object
      constant - the nature of the Variable object whether it is modifiable or not. If constant = true , then the Variable object represents a constant, whose value cannot be altered.Else,it represents a Variable object whose value can change.

  • Method Details

    • setType

      public void setType​(TYPE type)

    • getType

      public TYPE getType()

    • setFullName

      public void setFullName​(java.lang.String fullName)

    • getFullName

      public java.lang.String getFullName()

    • isConstant

      public boolean isConstant()
      Returns:
      true if the Variable object is a constant.

    • setConstant

      public void setConstant​(boolean constant)
      sets the nature of the Variable object to either Variable or constant
      Parameters:
      constant - = true if the Variable object is to be changed into a constant and constant = false if the Variable object is to be changed into a Variable object

    • isTheta

      public boolean isTheta()

    • isVariableBeginner

      public static boolean isVariableBeginner​(java.lang.String var)
      Parameters:
      var -
      Returns:
      true if the variable is a valid Variable starting character

    • isVariableString

      public static boolean isVariableString​(java.lang.String var)
      If the name is a string of alphabets and is not an operator name, then it is a valid variable name. If the name is alphanumeric,it is a valid variable name.
      Parameters:
      var - the string to check.
      Returns:
      true if the variable is a valid Variable object name.

    • isVariableBuilder

      public static boolean isVariableBuilder​(java.lang.String unit)

    • isSystemVar

      public static boolean isSystemVar​(java.lang.String str)
      Parameters:
      str - the name of the String variable
      Returns:
      true if the variable is one that is already defined by the parser for its own purposes. An example of such a variable is any constant parameter recognized by the parser, i.e to which the parser has attached a meaning already. Also any parameter such as the "ans" parameter which returns the last value calculated by the parser is regarded by the parser to be a system variable.

    • isSystemConstant

      public static boolean isSystemConstant​(java.lang.String str)
      Parameters:
      str - the name of the String variable
      Returns:
      true if the variable is a constant one that is already defined by the parser for its own purposes. An example of such a constant is any constant defined by the parser e.g PI and so on.

    • getSystemConstantValue

      public static java.lang.String getSystemConstantValue​(java.lang.String name)
      Parameters:
      name - the name of the system constant
      Returns:
      the constant value associated with it.

    • isExpNumber

      public static boolean isExpNumber​(java.lang.String str)
      Parameters:
      str - the name of the String variable
      Returns:
      true if the variable is ë

    • isPI

      public static boolean isPI​(java.lang.String str)
      Parameters:
      str - the name of the String variable
      Returns:
      true if the variable is PI

    • isTheta

      public static boolean isTheta​(java.lang.String str)
      Parameters:
      str - the name of the String variable
      Returns:
      true if the variable is theta

    • isLastEvaluatedAnswer

      public static boolean isLastEvaluatedAnswer​(java.lang.String str)
      Parameters:
      str - the name of the String variable
      Returns:
      true if the variable is the last result evaluated

    • isSimpleVar

      public boolean isSimpleVar()
      Returns:
      true if the variable is a simple one i.e A-Z or theta

    • setName

      public void setName​(java.lang.String name)
      Parameters:
      name - mutator method that changes the name of the variable

    • getName

      public java.lang.String getName()
      Returns:
      the String property of the variable

    • setValue

      public void setValue​(java.lang.String value)
      changes the value stored in the variable
      Parameters:
      value - The value to be stored. Sometimes the value contains a unit. To support this, the user should place a space between the value and the units.

    • getValue

      public java.lang.String getValue()
      returns the value of the variable
      Returns:
      the value stored in the variable

    • setUnits

      public void setUnits​(java.lang.String units)

    • getUnits

      public java.lang.String getUnits()

    • getSimpleVarIndex

      public static int getSimpleVarIndex​(java.lang.String var)
      Parameters:
      var - the String property of the variable.This method returns the index of the Variable object that has this String property.
      Returns:
      The index of the Variable object that has this String property.

    • getSimpleVarIndex

      public int getSimpleVarIndex()
      Returns:

    • equals

      public boolean equals​(java.lang.Object obj)
      Overrides:
      equals in class java.lang.Object

    • parse

      public static Variable parse​(java.lang.String enc)
      Parameters:
      enc - The encoded format of the byte array: [num1, num2, num3, num4, ...]
      Returns:
      the Variable object that represents the encoded data

    • serialize

      public java.lang.String serialize()
      Specified by:
      serialize in interface Savable

    • toString

      public java.lang.String toString()
      Overrides:
      toString in class java.lang.Object

    • main

      public static void main​(java.lang.String[] args)
      Parameters:
      args -