com.hazelcast.query.impl.predicates

Class PredicateUtils

java.lang.Object

com.hazelcast.query.impl.predicates.PredicateUtils

public final class PredicateUtils
extends Object

Method Summary

Modifier and Type	Method and Description
static String	canonicalizeAttribute(String attribute) Produces canonical attribute representation by stripping an unnecessary "this." qualifier from the passed attribute, if any.
static String	constructCanonicalCompositeIndexName(String[] components) Constructs a canonical index name from the given index components.
static int	estimatedSizeOf(Collection<QueryableEntry> result) In case of AndResultSet and OrResultSet calling size() may be very expensive so quicker estimatedSize() is used.
static boolean	isEqualPredicate(Predicate predicate)
static boolean	isNull(Comparable value)
static boolean	isRangePredicate(Predicate predicate)
static String[]	parseOutCompositeIndexComponents(String name) Parses the given index name into components.

Methods inherited from class java.lang.Object

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

Method Detail

estimatedSizeOf

public static int estimatedSizeOf(Collection<QueryableEntry> result)

In case of AndResultSet and OrResultSet calling size() may be very expensive so quicker estimatedSize() is used.

Parameters:

result - result of a predicated search

Returns:

size or estimated size

See Also:

AndResultSet.estimatedSize(), OrResultSet.estimatedSize()

isNull

public static boolean isNull(Comparable value)

Returns:

true if the given value is considered as a null-like by predicates and indexes, false otherwise.

isRangePredicate

public static boolean isRangePredicate(Predicate predicate)

Returns:

true if the given predicate is a RangePredicate, false otherwise.

isEqualPredicate

public static boolean isEqualPredicate(Predicate predicate)

Returns:

true if the given predicate is an EqualPredicate, false otherwise.

canonicalizeAttribute

public static String canonicalizeAttribute(String attribute)

Produces canonical attribute representation by stripping an unnecessary "this." qualifier from the passed attribute, if any.

Parameters:

attribute - the attribute to canonicalize.

Returns:

the canonicalized attribute representation.

See Also:

constructCanonicalCompositeIndexName(java.lang.String[])

parseOutCompositeIndexComponents

public static String[] parseOutCompositeIndexComponents(String name)

Parses the given index name into components.

Parameters:

name - the index name to parse.

Returns:

the parsed components or null if the given index name doesn't describe a composite index components.

Throws:

IllegalArgumentException - if the given index name is empty.

IllegalArgumentException - if the given index name contains empty components.

IllegalArgumentException - if the given index name contains duplicate components.

IllegalArgumentException - if the given index name has more than 255 components.

See Also:

constructCanonicalCompositeIndexName(java.lang.String[])

constructCanonicalCompositeIndexName

public static String constructCanonicalCompositeIndexName(String[] components)

Constructs a canonical index name from the given index components.

A canonical name is a comma-separated list of index components with a single space character going after every comma.

It's a caller's responsibility to canonicalize individual components as specified by canonicalizeAttribute(java.lang.String).

Parameters:

components - the index components to construct the canonical index name from.

Returns:

the constructed canonical index name.