ABLE 2.0.0 07/02/2003 10:25:01

com.ibm.able.data
Class AbleExpressionVariable

java.lang.Object
  |
  +--com.ibm.able.data.AbleLhs
        |
        +--com.ibm.able.data.AbleVariable
              |
              +--com.ibm.able.data.AbleGenericVariable
                    |
                    +--com.ibm.able.data.AbleTypedVariable
                          |
                          +--com.ibm.able.data.AbleExpressionVariable
All Implemented Interfaces:
AbleRd, AbleWr, java.io.Serializable

public class AbleExpressionVariable
extends AbleTypedVariable
implements java.io.Serializable

This class holds a value of an AbleExpression object. An object of type AbleExpressionVariable contains a single, mutable field whose type is AbleExpression. Instances of AbleExpressionVariable are used by the Able rules classes in clauses and expressions. In addition, this class provides methods for evauating AbleExpressions and returning the resulting value as other datatypes, as well as other logical comparison and math operator methods useful when dealing with AbleExpressions.

See Also:
Serialized Form

Field Summary
protected  AbleExpression myValue
          The current value of the variable.
 
Fields inherited from class com.ibm.able.data.AbleTypedVariable
myDataTypeClass, myDataTypeClassName, myDataTypeName, myInitialParms
 
Fields inherited from class com.ibm.able.data.AbleVariable
myBoundFlag, myChgSupport, myComment, myContext, myDataType, myGlobalFlag, myId, myName, myPrompt, myReferences, myStaticFlag, myTemplateFlag, myValueInitial
 
Constructor Summary
AbleExpressionVariable(java.lang.String theName, AbleExpression theInitialValue)
          Create a new Expression variable with the specified initial value.
AbleExpressionVariable(java.lang.String theName, boolean theStaticFlag, boolean theGlobalFlag)
          Create a new Expression variable with the specified initial value.
AbleExpressionVariable(java.lang.String theName, boolean theStaticFlag, boolean theGlobalFlag, AbleExpression theInitialValue)
          Create a new Expression variable with the specified initial value.
 
Method Summary
 java.lang.String arlDclString()
          Return a formal ARL "declaration" string that describes this data object.
 void asgnEq(AbleRd theRhs)
          Assignment: assign the current value of theRhs to this data object.
 AbleLiteral bitwiseXOR(AbleRd theRhs)
          Logical XOR: exclusive OR the current value of this data object with the current value of theRhs.
 boolean cmpEq(AbleRd theRhs)
          Comparison, equal to: compare the current value of this data object to the current value of theRhs.
 boolean cmpGt(AbleRd theRhs)
          Comparison, greater than: compare the current value of this data object to the current value of theRhs.
 boolean cmpGtEq(AbleRd theRhs)
          Comparison, greater than or equal to: compare the current value of this data object to the current value of theRhs.
 boolean cmpLt(AbleRd theRhs)
          Comparison, less than: compare the current value of this data object to the current value of theRhs.
 boolean cmpLtEq(AbleRd theRhs)
          Comparison, less than or equal to: compare the current value of this data object to the current value of theRhs.
 boolean cmpNeq(AbleRd theRhs)
          Comparison, not equal to: compare the current value of this data object to the current value of theRhs.
 AbleLiteral compDivide(AbleRd theRhs)
          Compute, divide the current value of this data object by the current value of theRhs.
 AbleLiteral compMinus(AbleRd theRhs)
          Compute, subtract the current value of theRhs from the current value of this object.
 AbleLiteral compMultiply(AbleRd theRhs)
          Compute, multiply the current value of this data object to the current value of theRhs.
 AbleLiteral compPlus(AbleRd theRhs)
          Compute, add or concatenate the current value of this data object to the current value of theRhs.
 AbleLiteral compUnaryMinus(AbleRd theRhs)
          Compute, the unary minus of the current value of this object.
static java.lang.String Copyright()
          Determine the copyright of this class.
 boolean getBooleanValue()
          Retrieve the value of this data object as a boolean value.
 java.lang.Class getDataTypeClass()
          Retrieve the actual class of this object's underlying data type.
 java.lang.String getDataTypeClassName()
          Retrieve the name of the class of this object's underlying data type.
 AbleFuzzySet getFuzzyValue()
          Retrieve the value of this data object as a fuzzy value.
 java.lang.Object getGenericValue()
          Retrieve the value of this data object as an Object.
 java.lang.Class getLiteralClass()
          Retrieve the class of this variable's related AbleLiteral data type.
 double getNumericValue()
          Retrieve the value of this data object as a numeric value.
 java.lang.Object getRawValue()
          Retrieve the variable's current value.
 java.lang.String getStringValue()
          Retrieve the value of this data object as a string value.
 AbleLiteral getValue()
          Retrieve the value of this data object as a literal.
 java.lang.String getValueString()
          Retrieve the variable's current value as a string.
 void init()
          Init the variable to its intial state.
 boolean logicalAND(AbleRd theRhs)
          Logical AND the current value of this data object with the current value of theRhs.
 boolean logicalNOT(AbleRd theRhs)
          Logical NOT: complement the current value of this data object.
 boolean logicalOR(AbleRd theRhs)
          Logical OR the current value of this data object with the current value of theRhs.
 void reset()
          Reset the variable to its intial state.
 void setBooleanValue(boolean theNewValue)
          Set the value of this data object from a boolean value.
 void setFuzzyValue(AbleFuzzySet theNewValue)
          Set the value of this data object from a fuzzy value.
 void setGenericValue(java.lang.Object theNewValue)
          Set the value of this data object from an object.
 void setNumericValue(double theNewValue)
          Set the value of this data object from a numeric value.
protected  void setRawValue(java.lang.Object theNewValue)
          Set the variable's current value.
 void setStringValue(java.lang.String theNewValue)
          Set the value of this data object from a string value.
 void setValue(AbleLiteral theNewValue)
          Set the value of this data object from a literal object.
 java.lang.String toString()
          Retrieve a string describing (the contents of) the object.
 java.lang.String traceString(int theTraceStringFlavor)
          Retrieve a string describing (the contents of) the object.
 java.lang.String xmlDclString()
          Return a formal XML "declaration" string that describes this data object.
 
Methods inherited from class com.ibm.able.data.AbleTypedVariable
getDataTypeName
 
Methods inherited from class com.ibm.able.data.AbleGenericVariable
cmpIs, replaceValues, setValueString
 
Methods inherited from class com.ibm.able.data.AbleVariable
arlCRdString, arlInitializerString, getArlComment, getChgSupport, getComment, getContext, getDataType, getDataTypeAsString, getId, getName, getPrompt, getPromptString, getReferences, getReferent, getReferents, getTemplateString, isBound, isConstant, isGlobal, isLocal, isStatic, isTemplate, notStatic, setChgSupport, setComment, setContext, setId, setInitialValue, setPrompt, setReferences, setStatic, setTemplate, xmlCRdString, xmlCWrString, xmlInitializerString
 
Methods inherited from class com.ibm.able.data.AbleLhs
asgnIs, asgnIs, bitwiseAND, bitwiseNOT, bitwiseOR, bitwiseShiftLeft, bitwiseShiftRight, bitwiseShiftRightZeroFill, compModulo
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
 

Field Detail

myValue

protected AbleExpression myValue
The current value of the variable.
Constructor Detail

AbleExpressionVariable

public AbleExpressionVariable(java.lang.String theName,
                              AbleExpression theInitialValue)
Create a new Expression variable with the specified initial value.
Parameters:
theName - The unique name of the variable.

theInitialValue - The value to which this variable is initially set.


AbleExpressionVariable

public AbleExpressionVariable(java.lang.String theName,
                              boolean theStaticFlag,
                              boolean theGlobalFlag,
                              AbleExpression theInitialValue)
Create a new Expression variable with the specified initial value.
Parameters:
theName - The unique name of the variable.

theStaticFlag - Use true if this variable is to be marked as static, which means that it will ignore future reset requests; use false if the variable can be reset to its initial value when requested.

theGlobalFlag - Use true if this variable is to be considered global; use false if the variable is to be considered local.

theInitialValue - The value to which this variable is initially set.


AbleExpressionVariable

public AbleExpressionVariable(java.lang.String theName,
                              boolean theStaticFlag,
                              boolean theGlobalFlag)
Create a new Expression variable with the specified initial value.
Parameters:
theName - The unique name of the variable.

theStaticFlag - Use true if this variable is to be marked as static, which means that it will ignore future reset requests; use false if the variable can be reset to its initial value when requested.

theGlobalFlag - Use true if this variable is to be considered global; use false if the variable is to be considered local.

theInitialValue - The value to which this variable is initially set.

Method Detail

getBooleanValue

public boolean getBooleanValue()
                        throws AbleDataException
Retrieve the value of this data object as a boolean value.
Overrides:
getBooleanValue in class AbleGenericVariable
Returns:
A boolean, if the value of this object can be represented as a boolean value. If the current value is 0.0, false is returned; any other numeric value returns true.
Throws:
AbleDataException - If the value of this object cannot be represented as a boolean value.

getFuzzyValue

public AbleFuzzySet getFuzzyValue()
                           throws AbleDataException
Retrieve the value of this data object as a fuzzy value.
Overrides:
getFuzzyValue in class AbleGenericVariable
Returns:
A fuzzy set, if the value of this object can be represented as a fuzzy value. This method always throws an exception.
Throws:
AbleDataException - If the value of this object cannot be represented as a fuzzy value.

getGenericValue

public java.lang.Object getGenericValue()
                                 throws AbleDataException
Retrieve the value of this data object as an Object.
Overrides:
getGenericValue in class AbleGenericVariable
Returns:
An Expression object.
Throws:
AbleDataException - If the value of this object cannot be represented as an Object.

getNumericValue

public double getNumericValue()
                       throws AbleDataException
Retrieve the value of this data object as a numeric value.
Overrides:
getNumericValue in class AbleGenericVariable
Returns:
A double, if the value of this object can be represented as a numeric value.
Throws:
AbleDataException - If the value of this object cannot be represented as a numeric value.

getStringValue

public java.lang.String getStringValue()
                                throws AbleDataException
Retrieve the value of this data object as a string value.
Overrides:
getStringValue in class AbleGenericVariable
Returns:
A String, if the value of this object can be represented as a string value.
Throws:
AbleDataException - If the value of this object cannot be represented as a string value.

getValue

public AbleLiteral getValue()
                     throws AbleDataException
Retrieve the value of this data object as a literal.
Overrides:
getValue in class AbleGenericVariable
Returns:
An AbleNumericLiteral object.
Throws:
AbleDataException - If the value of this object cannot be represented as a literal.

asgnEq

public void asgnEq(AbleRd theRhs)
            throws AbleDataException
Assignment: assign the current value of theRhs to this data object.
Overrides:
asgnEq in class AbleGenericVariable
Parameters:
theRhs - The right-hand, or source, side of the assignment.

Throws:
AbleDataException - If the right-hand side cannot be converted (if necessary) and assigned to this data object.

cmpEq

public boolean cmpEq(AbleRd theRhs)
              throws AbleDataException
Comparison, equal to: compare the current value of this data object to the current value of theRhs.

"==" is used for numeric and boolean compares; equals() is used for Object compares; and Collator.equals() is used for String compares.

Overrides:
cmpEq in class AbleGenericVariable
Parameters:
theRhs - The right-hand side of the comparison.

Returns:
true, if this data object is equal to theRhs; false, otherwise.
Throws:
AbleDataException - If the right-hand side cannot be converted (if necessary) and compared to this data object.

cmpGt

public boolean cmpGt(AbleRd theRhs)
              throws AbleDataException
Comparison, greater than: compare the current value of this data object to the current value of theRhs.

">" is used for numeric compares; Collator.compare() is used for String compares. Use of other data types on the left-hand side causes an exception.

Overrides:
cmpGt in class AbleGenericVariable
Parameters:
theRhs - The right-hand side of the comparison.

Returns:
true, if this data object is greater than theRhs; false, otherwise.
Throws:
AbleDataException - If the right-hand side cannot be converted (if necessary) and compared to this data object.

cmpGtEq

public boolean cmpGtEq(AbleRd theRhs)
                throws AbleDataException
Comparison, greater than or equal to: compare the current value of this data object to the current value of theRhs.

">=" is used for numeric compares; Collator.compare() is used for String compares. Use of other data types on the left-hand side causes an exception.

Overrides:
cmpGtEq in class AbleGenericVariable
Parameters:
theRhs - The right-hand side of the comparison.

Returns:
true, if this data object is greater than or equal to theRhs; false, otherwise.
Throws:
AbleDataException - If the right-hand side cannot be converted (if necessary) and compared to this data object.

cmpLt

public boolean cmpLt(AbleRd theRhs)
              throws AbleDataException
Comparison, less than: compare the current value of this data object to the current value of theRhs.

"<" is used for numeric compares; Collator.compare() is used for String compares. Use of other data types on the left-hand side causes an exception.

Overrides:
cmpLt in class AbleGenericVariable
Parameters:
theRhs - The right-hand side of the comparison.

Returns:
true, if this data object is less than theRhs; false, otherwise.
Throws:
AbleDataException - If the right-hand side cannot be converted (if necessary) and compared to this data object.

cmpLtEq

public boolean cmpLtEq(AbleRd theRhs)
                throws AbleDataException
Comparison, less than or equal to: compare the current value of this data object to the current value of theRhs.

"<=" is used for numeric compares; Collator.compare() is used for String compares. Use of other data types on the left-hand side causes an exception.

Overrides:
cmpLtEq in class AbleGenericVariable
Parameters:
theRhs - The right-hand side of the comparison.

Returns:
true, if this data object is less than or equal to theRhs; false, otherwise.
Throws:
AbleDataException - If the right-hand side cannot be converted (if necessary) and compared to this data object.

cmpNeq

public boolean cmpNeq(AbleRd theRhs)
               throws AbleDataException
Comparison, not equal to: compare the current value of this data object to the current value of theRhs.

"!=" is used for numeric and boolean compares; ! equals() is used for Object compares; and ! Collator.equals() is used for String compares.

Overrides:
cmpNeq in class AbleGenericVariable
Parameters:
theRhs - The right-hand side of the comparison.

Returns:
true, if this data object is not equal to theRhs; false, otherwise.
Throws:
AbleDataException - If the right-hand side cannot be converted (if necessary) and compared to this data object.

compPlus

public AbleLiteral compPlus(AbleRd theRhs)
                     throws AbleDataException
Compute, add or concatenate the current value of this data object to the current value of theRhs.

"+" is used for numeric addtion and String concatenation.

Overrides:
compPlus in class AbleGenericVariable
Parameters:
theRhs - The right-hand side of the comparison.

Returns:
The result of the addition or concatenation operation.
Throws:
AbleDataException - If the right-hand side cannot be converted (if necessary) and compared to this data object.

compMinus

public AbleLiteral compMinus(AbleRd theRhs)
                      throws AbleDataException
Compute, subtract the current value of theRhs from the current value of this object.

"-" is used for numeric subtraction.

Overrides:
compMinus in class AbleGenericVariable
Parameters:
theRhs - The right-hand side of the comparison.

Returns:
The result of the subtraction operation.
Throws:
AbleDataException - If the right-hand side cannot be converted (if necessary) and compared to this data object.

compMultiply

public AbleLiteral compMultiply(AbleRd theRhs)
                         throws AbleDataException
Compute, multiply the current value of this data object to the current value of theRhs.

"*" is used for numeric multiplication.

Overrides:
compMultiply in class AbleGenericVariable
Parameters:
theRhs - The right-hand side of the comparison.

Returns:
The result of the multiplication operation.
Throws:
AbleDataException - If the right-hand side cannot be converted (if necessary) and compared to this data object.

compDivide

public AbleLiteral compDivide(AbleRd theRhs)
                       throws AbleDataException
Compute, divide the current value of this data object by the current value of theRhs.

"/" is used for numeric division.

Overrides:
compDivide in class AbleGenericVariable
Parameters:
theRhs - The right-hand side of the comparison.

Returns:
The result of the division operation.
Throws:
AbleDataException - If the right-hand side cannot be converted (if necessary) and compared to this data object.

compUnaryMinus

public AbleLiteral compUnaryMinus(AbleRd theRhs)
                           throws AbleDataException
Compute, the unary minus of the current value of this object.

"-" is used for numeric negation.

Overrides:
compUnaryMinus in class AbleGenericVariable
Parameters:
theRhs - The right-hand side of the operation (ignored).

Returns:
The result of the negation operation.
Throws:
AbleDataException - If the value of this data object cannot be negated.

logicalAND

public boolean logicalAND(AbleRd theRhs)
                   throws AbleDataException
Logical AND the current value of this data object with the current value of theRhs.

"&&" is used for boolean AND.

Overrides:
logicalAND in class AbleLhs
Parameters:
theRhs - The right-hand side of the comparison.

Returns:
The result of the logical AND operation.
Throws:
AbleDataException - If the right-hand side cannot be converted (if necessary) and compared to this data object.

logicalOR

public boolean logicalOR(AbleRd theRhs)
                  throws AbleDataException
Logical OR the current value of this data object with the current value of theRhs.

"||" is used for boolean OR.

Overrides:
logicalOR in class AbleLhs
Parameters:
theRhs - The right-hand side of the comparison.

Returns:
The result of the logical OR operation.
Throws:
AbleDataException - If the right-hand side cannot be converted (if necessary) and compared to this data object.

logicalNOT

public boolean logicalNOT(AbleRd theRhs)
                   throws AbleDataException
Logical NOT: complement the current value of this data object.

"!" is used for boolean NOT.

Overrides:
logicalNOT in class AbleLhs
Parameters:
theRhs - The right-hand side of the comparison.

Returns:
The result of the boolean NOT operation.
Throws:
AbleDataException - If the right-hand side cannot be converted (if necessary) and compared to this data object.

bitwiseXOR

public AbleLiteral bitwiseXOR(AbleRd theRhs)
                       throws AbleDataException
Logical XOR: exclusive OR the current value of this data object with the current value of theRhs.

"^" is used for bitwise or logical XOR.

Overrides:
bitwiseXOR in class AbleLhs
Parameters:
theRhs - The right-hand side of the operation.

Returns:
The result of the logical XOR operation.
Throws:
AbleDataException - If the right-hand side cannot be converted (if necessary) and compared to this data object.

setBooleanValue

public void setBooleanValue(boolean theNewValue)
                     throws AbleDataException
Set the value of this data object from a boolean value.
Overrides:
setBooleanValue in class AbleGenericVariable
Parameters:
theNewValue - A boolean value. If the new value is true the variable is set to 1.0; if the new value is false the variable is set to 0.0.

Throws:
AbleDataException - If the value of this object cannot be represented as a boolean value.

setFuzzyValue

public void setFuzzyValue(AbleFuzzySet theNewValue)
                   throws AbleDataException
Set the value of this data object from a fuzzy value. This method always throws an exception.
Overrides:
setFuzzyValue in class AbleGenericVariable
Parameters:
theNewValue - A fuzzy set.

Throws:
AbleDataException - If the value of this object cannot be represented as a fuzzy value.

setGenericValue

public void setGenericValue(java.lang.Object theNewValue)
                     throws AbleDataException
Set the value of this data object from an object.
Overrides:
setGenericValue in class AbleGenericVariable
Parameters:
theNewValue - Any type of Object.

Throws:
AbleDataException - If the value of this object cannot be derived from the specified Object.

setNumericValue

public void setNumericValue(double theNewValue)
                     throws AbleDataException
Set the value of this data object from a numeric value.
Overrides:
setNumericValue in class AbleGenericVariable
Parameters:
theNewValue - Any number.

Throws:
AbleDataException - If the value of this object cannot be represented as a numeric value.

setStringValue

public void setStringValue(java.lang.String theNewValue)
                    throws AbleDataException
Set the value of this data object from a string value.
Overrides:
setStringValue in class AbleTypedVariable
Parameters:
theNewValue - A string. The variable is set to the value of the string, but only if the string can be parsed to a double; otherwise an exception is thrown.

Throws:
AbleDataException - If the value of this object cannot be represented as a string value.

setValue

public void setValue(AbleLiteral theNewValue)
              throws AbleDataException
Set the value of this data object from a literal object.
Overrides:
setValue in class AbleGenericVariable
Parameters:
theNewValue - An Able literal of any type. An attempt is made to convert the literal to an appropriate type before assigning it to this "writable" object.

Throws:
AbleDataException - If the value of this object cannot be determined from the literal object.

arlDclString

public java.lang.String arlDclString()
Return a formal ARL "declaration" string that describes this data object.
Overrides:
arlDclString in class AbleTypedVariable
Returns:
A String describing the data object in formal rule language.

xmlDclString

public java.lang.String xmlDclString()
Return a formal XML "declaration" string that describes this data object.
Overrides:
xmlDclString in class AbleTypedVariable
Returns:
A String describing the data object in XML.

getValueString

public java.lang.String getValueString()
Retrieve the variable's current value as a string. Note: This method is provided for the use of a rule language parser.
Overrides:
getValueString in class AbleGenericVariable

reset

public void reset()
           throws AbleDataException
Reset the variable to its intial state.
Overrides:
reset in class AbleTypedVariable

init

public void init()
          throws AbleDataException
Init the variable to its intial state.
Overrides:
init in class AbleTypedVariable

getDataTypeClass

public java.lang.Class getDataTypeClass()
Description copied from class: AbleLhs
Retrieve the actual class of this object's underlying data type.
Overrides:
getDataTypeClass in class AbleTypedVariable
Following copied from class: com.ibm.able.data.AbleLhs
Returns:
The class of the underlying data type.

getDataTypeClassName

public java.lang.String getDataTypeClassName()
Description copied from class: AbleLhs
Retrieve the name of the class of this object's underlying data type.
Overrides:
getDataTypeClassName in class AbleTypedVariable
Following copied from class: com.ibm.able.data.AbleLhs
Returns:
A String that is the name of the class of the underlying data type.

getLiteralClass

public java.lang.Class getLiteralClass()
Retrieve the class of this variable's related AbleLiteral data type.
Overrides:
getLiteralClass in class AbleGenericVariable
Returns:
The class of the literal data type.

setRawValue

protected void setRawValue(java.lang.Object theNewValue)
                    throws AbleDataException
Set the variable's current value.

Note that this method fires a PropertyChange with both old and new values, but only if a PropertyChangeSupport object has been set in the variable.

Note that this method updates all objects that refer to this variable, but only if a set of references has been set in the variable.

Overrides:
setRawValue in class AbleTypedVariable

getRawValue

public java.lang.Object getRawValue()
Retrieve the variable's current value.

toString

public java.lang.String toString()
Retrieve a string describing (the contents of) the object.
Overrides:
toString in class AbleTypedVariable
Returns:
A String containing the current contents of the object.

traceString

public java.lang.String traceString(int theTraceStringFlavor)
Retrieve a string describing (the contents of) the object.
Overrides:
traceString in class AbleTypedVariable
Parameters:
theFlavor - An Able.TraceStringFlavor value.

Returns:
A String containing the current contents of the object.

Copyright

public static java.lang.String Copyright()
Determine the copyright of this class.
Returns:
A String containing this class's copyright statement.

ABLE 2.0.0 07/02/2003 10:25:01

(C) Copyright IBM Corporation 1999, 2003