jrun.ejb.ejbql
Class BinaryOperator

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

All Implemented Interfaces:

Element, Operator

public abstract class BinaryOperator

extends OperatorBase

An operator that takes two operands.

Author:

Enrique Duvos

Field Summary

static BinaryOperator	ADD
static BinaryOperator	CONCAT
static boolean	debug
static BinaryOperator	DIVIDE
static BinaryOperator	EQUAL
static BinaryOperator	GREATER_THAN
static BinaryOperator	GREATER_THAN_OR_EQUAL
static BinaryOperator	IN_STRINGS
static BinaryOperator	LESS_THAN
static BinaryOperator	LESS_THAN_OR_EQUAL
static BinaryOperator	MEMBER_OF
static BinaryOperator	MULTIPLY
static BinaryOperator	NOT_EQUAL
static BinaryOperator	NOT_IN_STRINGS
static BinaryOperator	NOT_MEMBER_OF
static BinaryOperator	SELECT_FIELD
static BinaryOperator	SUBTRACT

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

BinaryOperator()

Method Summary

protected abstract java.lang.String	doGetPrintString()
protected java.lang.String	getBinaryPromotionType(Expression firstExpr, Expression secondExpr) Binary numeric type promotion.
java.util.Iterator	getPrintStrings(java.util.Vector expressions) Return the operator strings to be used to print out the entire expression.
java.lang.String	getResultType(Expression firstExpr, Expression secondExpr)
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	isBinary()
abstract boolean	operatesOn(Expression firstExpression, Expression secondExpression)
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, isFunction, isNary, isUnary

Methods inherited from class java.lang.Object

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

Field Detail

debug

public static final boolean debug

IN_STRINGS

public static final BinaryOperator IN_STRINGS

NOT_IN_STRINGS

public static final BinaryOperator NOT_IN_STRINGS

EQUAL

public static final BinaryOperator EQUAL

NOT_EQUAL

public static final BinaryOperator NOT_EQUAL

GREATER_THAN

public static final BinaryOperator GREATER_THAN

GREATER_THAN_OR_EQUAL

public static final BinaryOperator GREATER_THAN_OR_EQUAL

LESS_THAN_OR_EQUAL

public static final BinaryOperator LESS_THAN_OR_EQUAL

LESS_THAN

public static final BinaryOperator LESS_THAN

ADD

public static final BinaryOperator ADD

SUBTRACT

public static final BinaryOperator SUBTRACT

MULTIPLY

public static final BinaryOperator MULTIPLY

DIVIDE

public static final BinaryOperator DIVIDE

CONCAT

public static final BinaryOperator CONCAT

MEMBER_OF

public static final BinaryOperator MEMBER_OF

NOT_MEMBER_OF

public static final BinaryOperator NOT_MEMBER_OF

SELECT_FIELD

public static final BinaryOperator SELECT_FIELD

Constructor Detail

BinaryOperator

public BinaryOperator()

Method Detail

isBinary

public boolean isBinary()

Overrides:

isBinary 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 firstExpression,
                                   Expression secondExpression)

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 java.lang.String getResultType(Expression firstExpr,
                                      Expression secondExpr)

getBinaryPromotionType

protected java.lang.String getBinaryPromotionType(Expression firstExpr,
                                                  Expression secondExpr)

Binary numeric type promotion. JLS 5.6.2

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" }

doGetPrintString

protected abstract java.lang.String doGetPrintString()