org.ceryle.wiki.plugin.query.operators
Class Operator

java.lang.Object
  org.ceryle.wiki.plugin.query.operators.Operator

Direct Known Subclasses:

AllOperator, AndOperator, AnyOperator, ByModifier, FromModifier, IsModifier, NotOperator, NullOperator, OrOperator, Predicate, ToModifier

public abstract class Operator
extends Object

The abstract class of query expression Operators. Includes: AllOperator, AndOperator, AnyOperator, FromModifier (AKA ByModifier), ExpressionKeyword, IsModifier, Modifier, NotOperator, NullOperator, Operator, OrOperator, and ToModifier.

Author:

Murray Altheim, John Volkar (john.volkar at gmail.com)

Field Summary

static String	_ALL The String token for the ALL operator.
static String	_AND The String token for the AND operator.
static String	_ANY The String token for the ANY operator.
static String	_BY The String token for the BY operator.
static String	_FROM The String token for the FROM operator.
static String	_IS The String token for the IS operator.
static String	_NOT The String token for the NOT operator.
static String	_NULL The String token for the NULL operator.
static String	_OR The String token for the OR operator.
static String	_TO The String token for the TO operator.

Constructor Summary

protected

Operator(String name) Hide constructor from public, allow subclass access.

Method Summary

abstract boolean	evaluateOperator(Operand left, Operand right, Modifier modifier, ReferenceInfoProvider refInfoProvider, String pageName)
String	getName() Returns the name of this Operator (returns the same thing as toString()).
boolean	isInfix()
boolean	isPrefix()
String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

_NULL

public static final String _NULL

The String token for the NULL operator.

See Also:

Constant Field Values

_ALL

public static final String _ALL

The String token for the ALL operator.

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Constant Field Values

_AND

public static final String _AND

The String token for the AND operator.

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Constant Field Values

_ANY

public static final String _ANY

The String token for the ANY operator.

See Also:

Constant Field Values

_BY

public static final String _BY

The String token for the BY operator. This is equivalent to (and replaced by) the _FROM operator.

See Also:

Constant Field Values

_FROM

public static final String _FROM

The String token for the FROM operator. This is equivalent to (and replaces) the _BY operator.

See Also:

Constant Field Values

_IS

public static final String _IS

The String token for the IS operator.

See Also:

Constant Field Values

_NOT

public static final String _NOT

The String token for the NOT operator.

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Constant Field Values

_OR

public static final String _OR

The String token for the OR operator.

See Also:

Constant Field Values

_TO

public static final String _TO

The String token for the TO operator.

See Also:

Constant Field Values

Constructor Detail

Operator

protected Operator(String name)

Hide constructor from public, allow subclass access.

Parameters:

name -

Method Detail

isInfix

public boolean isInfix()

isPrefix

public final boolean isPrefix()

evaluateOperator

public abstract boolean evaluateOperator(Operand left,
                                         Operand right,
                                         Modifier modifier,
                                         ReferenceInfoProvider refInfoProvider,
                                         String pageName)
                                  throws QueryException

Throws:

QueryException

getName

public String getName()

Returns the name of this Operator (returns the same thing as toString()).

toString

public String toString()

Overrides:

toString in class Object