org.oreodata.predicates
Class SimplePredicate

java.lang.Object
  |
  +--org.oreodata.predicates.Predicate
        |
        +--org.oreodata.predicates.SimplePredicate

All Implemented Interfaces:

RecordFilter, java.io.Serializable

public class SimplePredicate

extends Predicate

A Predicate that represents a simple comparison filter.

Author:

Jonathan Revusky

See Also:

Serialized Form

Field Summary

static int	EQUALS
static int	GREATER_THAN
static int	GREATER_THAN_EQUALS
static int	IS_NULL
static int	LESS_THAN
static int	LESS_THAN_EQUALS
static int	LIKE
static int	NOT_EQUALS
static int	NOT_LIKE
static int	NOT_NULL

Fields inherited from class org.oreodata.predicates.Predicate

complement

Constructor Summary

protected	SimplePredicate(int comparisonType, java.lang.String recType, java.lang.String fieldName, java.lang.Object comparisonValue, java.util.Comparator comparator)
protected	SimplePredicate(int comparisonType, java.lang.String recType, java.lang.String fieldName, java.lang.Object comparisonValue, java.util.Comparator comparator, boolean caseInsensitive)

Method Summary

boolean	accept(Record rec) Does this record meet the filter criterion?
Predicate	getComplement()
java.lang.String	recType() says what kind of record type we are looking for, i.e.
java.lang.String	sqlEquivalent()

Methods inherited from class java.lang.Object

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

Field Detail

IS_NULL

public static final int IS_NULL

See Also:

Constant Field Values

EQUALS

public static final int EQUALS

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Constant Field Values

GREATER_THAN

public static final int GREATER_THAN

See Also:

Constant Field Values

LESS_THAN

public static final int LESS_THAN

See Also:

Constant Field Values

LIKE

public static final int LIKE

See Also:

Constant Field Values

NOT_NULL

public static final int NOT_NULL

See Also:

Constant Field Values

NOT_EQUALS

public static final int NOT_EQUALS

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Constant Field Values

LESS_THAN_EQUALS

public static final int LESS_THAN_EQUALS

See Also:

Constant Field Values

GREATER_THAN_EQUALS

public static final int GREATER_THAN_EQUALS

See Also:

Constant Field Values

NOT_LIKE

public static final int NOT_LIKE

See Also:

Constant Field Values

Constructor Detail

SimplePredicate

protected SimplePredicate(int comparisonType,
                          java.lang.String recType,
                          java.lang.String fieldName,
                          java.lang.Object comparisonValue,
                          java.util.Comparator comparator,
                          boolean caseInsensitive)

SimplePredicate

protected SimplePredicate(int comparisonType,
                          java.lang.String recType,
                          java.lang.String fieldName,
                          java.lang.Object comparisonValue,
                          java.util.Comparator comparator)

Method Detail

sqlEquivalent

public java.lang.String sqlEquivalent()

Specified by:

sqlEquivalent in interface RecordFilter

Specified by:

sqlEquivalent in class Predicate

Returns:

The SQL SELECT command that is the equivalent to this. A null value would indicate that we don't know the SQL command. In that case, the filter will have to be applied in-memory.

accept

public boolean accept(Record rec)

Description copied from interface: RecordFilter

Does this record meet the filter criterion?

Specified by:

accept in interface RecordFilter

Specified by:

accept in class Predicate

getComplement

public Predicate getComplement()

Specified by:

getComplement in class Predicate

recType

public java.lang.String recType()

Description copied from interface: RecordFilter

says what kind of record type we are looking for, i.e. the filter will only return results of a certain record type. If this returns null, it means that we could have heterogeneous results.

Specified by:

recType in interface RecordFilter

Specified by:

recType in class Predicate