Class AbstractOperator

java.lang.Object

com.igormaznitsa.jcp.expression.operators.AbstractOperator

All Implemented Interfaces:

ExpressionItem

Direct Known Subclasses:

OperatorADD, OperatorAND, OperatorDIV, OperatorEQU, OperatorGREAT, OperatorGREATEQU, OperatorLESS, OperatorLESSEQU, OperatorMOD, OperatorMUL, OperatorNOT, OperatorNOTEQU, OperatorOR, OperatorSUB, OperatorXOR

public abstract class AbstractOperator
extends Object
implements ExpressionItem

The class is the base for all operator handlers

Field Summary

Fields

Modifier and Type	Field	Description
static final AbstractOperator[]	ALL_OPERATORS	The array contains all operators allowed by the preprocessor
static final String	EXECUTION_PREFIX	The constant is the prefix for executing methods of operators

Constructor Summary

Constructors

Constructor	Description
AbstractOperator()

Method Summary

Modifier and Type	Method	Description
static <E extends AbstractOperator> E	findForClass(Class<E> operatorClass)	Find an operator handler for its class
abstract int	getArity()	Get the operator arity
ExpressionItemType	getExpressionItemType()	Get the expression item type
abstract String	getKeyword()	Get the operator keyword
abstract String	getReference()	Get the operator reference to be shown for a help information request
String	toString()

Methods inherited from class Object

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

Methods inherited from interface ExpressionItem

getExpressionItemPriority

Field Details

EXECUTION_PREFIX

public static final String EXECUTION_PREFIX

The constant is the prefix for executing methods of operators

See Also:

• Constant Field Values

ALL_OPERATORS

public static final AbstractOperator[] ALL_OPERATORS

The array contains all operators allowed by the preprocessor

Constructor Details

AbstractOperator

public AbstractOperator()

Method Details

findForClass

public static <E extends AbstractOperator> E findForClass(Class<E> operatorClass)

Find an operator handler for its class

Type Parameters:

E - the handler class extends AbstractOperator

Parameters:

operatorClass - the class to be used for search, must not be null

Returns:

an instance of the handler or null if there is not any such one

getExpressionItemType

public ExpressionItemType getExpressionItemType()

Get the expression item type

Specified by:

getExpressionItemType in interface ExpressionItem

Returns:

for operators it is always ExpressionItemType.OPERATOR

getArity

public abstract int getArity()

Get the operator arity

Returns:

the operator arity (1 or 2)

getKeyword

public abstract String getKeyword()

Get the operator keyword

Returns:

the operator keyword, must not be null

getReference

public abstract String getReference()

Get the operator reference to be shown for a help information request

Returns:

the operator reference as a String, must not be null

toString

public String toString()

Overrides:

toString in class Object