jrun.ejb.ejbql
Class UnaryOperator

java.lang.Object
  |
  +--jrun.ejb.ejbql.OperatorBase
        |
        +--jrun.ejb.ejbql.UnaryOperator

All Implemented Interfaces:

Element, Operator

Direct Known Subclasses:

NavigationOperator

public abstract class UnaryOperator

extends OperatorBase

An operator that takes 1 operand.

Author:

Enrique Duvos

Field Summary

static UnaryOperator	ABS
static UnaryOperator	ESCAPE
static UnaryOperator	IS_EMPTY
static UnaryOperator	IS_NOT_EMPTY
static UnaryOperator	IS_NOT_NULL
static UnaryOperator	IS_NULL
static UnaryOperator	LENGTH
static UnaryOperator	MINUS
static UnaryOperator	NOT
static UnaryOperator	PLUS
static UnaryOperator	SELECT_ALL
static UnaryOperator	SQRT

Fields inherited from class jrun.ejb.ejbql.OperatorBase

BOOLEAN_OBJECT_TYPE_NAME, BOOLEAN_PRIMITIVE_TYPE_NAME, DOUBLE_OBJECT_TYPE_NAME, DOUBLE_PRIMITIVE_TYPE_NAME, FLOAT_OBJECT_TYPE_NAME, FLOAT_PRIMITIVE_TYPE_NAME, INTEGER_OBJECT_TYPE_NAME, INTEGER_PRIMITIVE_TYPE_NAME, LONG_OBJECT_TYPE_NAME, LONG_PRIMITIVE_TYPE_NAME, STRING_TYPE_NAME

Fields inherited from interface jrun.ejb.ejbql.Element

UNSPECIFIED_TRAVERSAL_ORDER

Constructor Summary

protected	UnaryOperator()
protected	UnaryOperator(boolean preOperator)

Method Summary

abstract java.lang.String	getPrintString()
java.util.Iterator	getPrintStrings(java.util.Vector expressions) Return the operator strings to be used to print out the entire expression.
abstract java.lang.String	getResultType(Expression expression)
java.lang.String	getResultType(java.util.Vector expressions) The stringified version of the java Class type that results from applying the operator to the given set of expressions.
boolean	isPostOperator()
boolean	isPreOperator()
boolean	isUnary()
abstract boolean	operatesOn(Expression expression)
boolean	operatesOn(java.util.Vector expressions) True if an operator can be applied to a given set of expressions.

Methods inherited from class jrun.ejb.ejbql.OperatorBase

accept, acceptOperatorExpression, equals, getChildren, hasBooleanType, hasDoubleType, hasFloatType, hasIntegerType, hasLongType, hasNumericType, hasSmallerNumericType, hasStringType, isBinary, isFunction, isNary

Methods inherited from class java.lang.Object

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

Field Detail

ESCAPE

public static final UnaryOperator ESCAPE

NOT

public static final UnaryOperator NOT

PLUS

public static final UnaryOperator PLUS

MINUS

public static final UnaryOperator MINUS

IS_NULL

public static final UnaryOperator IS_NULL

IS_NOT_NULL

public static final UnaryOperator IS_NOT_NULL

IS_EMPTY

public static final UnaryOperator IS_EMPTY

IS_NOT_EMPTY

public static final UnaryOperator IS_NOT_EMPTY

LENGTH

public static final UnaryOperator LENGTH

ABS

public static final UnaryOperator ABS

SQRT

public static final UnaryOperator SQRT

SELECT_ALL

public static final UnaryOperator SELECT_ALL

Constructor Detail

UnaryOperator

protected UnaryOperator(boolean preOperator)

UnaryOperator

protected UnaryOperator()

Method Detail

isUnary

public boolean isUnary()

Overrides:

isUnary in class OperatorBase

operatesOn

public boolean operatesOn(java.util.Vector expressions)

Description copied from interface: Operator

True if an operator can be applied to a given set of expressions. E.g. The Plus operator can only operate on exactly two expressions, each of which has numeric type.

operatesOn

public abstract boolean operatesOn(Expression expression)

getResultType

public java.lang.String getResultType(java.util.Vector expressions)

Description copied from interface: Operator

The stringified version of the java Class type that results from applying the operator to the given set of expressions.

getResultType

public abstract java.lang.String getResultType(Expression expression)

isPreOperator

public boolean isPreOperator()

isPostOperator

public boolean isPostOperator()

getPrintStrings

public java.util.Iterator getPrintStrings(java.util.Vector expressions)

Description copied from interface: Operator

Return the operator strings to be used to print out the entire expression. Might be multiple strings, e.g. Expr1 BETWEEN Expr2 AND Expr3 print strings = { "BETWEEN", "AND" }

getPrintString

public abstract java.lang.String getPrintString()