ch.ethz.mxquery.opt.expr
Class CompareLiteral

java.lang.Object
  ch.ethz.mxquery.opt.expr.LogicalUnit
      ch.ethz.mxquery.opt.expr.Literal
          ch.ethz.mxquery.opt.expr.CompareLiteral

All Implemented Interfaces:

Traversable, java.lang.Cloneable, java.lang.Comparable

public final class CompareLiteral
extends Literal

Represents a compare literal in a conjunction term

Field Summary

static int	DEPENDENCY_END_END
static int	DEPENDENCY_END_STARTEND
static int	DEPENDENCY_NO_END
static int	DEPENDENCY_NO_NO
static int	DEPENDENCY_NO_START
static int	DEPENDENCY_NO_STARTEND
static int	DEPENDENCY_START_END
static int	DEPENDENCY_START_START
static int	DEPENDENCY_START_STARTEND
static int	DEPENDENCY_STARTEND_STARTEND

Fields inherited from class ch.ethz.mxquery.opt.expr.LogicalUnit

DEPENDENCY_END, DEPENDENCY_NO, DEPENDENCY_START, DEPENDENCY_STARTEND, INDEX_IMPOSSIBLE, INDEX_POSSIBLE, INDEX_RECOMMEND, RESET, RESULT_FALSE, RESULT_TRUE, RESULT_UNKNOWN

Constructor Summary

CompareLiteral(XDMIterator iter, int comparator, int compareType, ValueLiteral leftLiteral, ValueLiteral rightLiteral)

Method Summary

java.lang.Object	clone() Creates a deep copy!
int	compareTo(java.lang.Object o) Needed to compare literals depending on their dependencies
boolean	equals(java.lang.Object obj)
int	getComparator() Returns the comparator id (based on CompareIterator constants)
int	getCompareDependency() Returns the compare dependency
static java.lang.String	getCompareDependencyName(int dep)
int	getCompareType() Returns the comparator type (value, general, node based on CompareIterator constants)
ValueLiteral	getLeftLiteral() Returns the left part of the comparison (this part has always a lower dependency than the right part
ValueLiteral	getRightLiteral() Returns the left part of the comparison (this part has always a higher dependency than the right part
int	hashCode()
int	reset(int level) Resets the logical unit up to a certain degree on variable dependency
KXmlSerializer	traverse(KXmlSerializer serializer) Just for debugging

Methods inherited from class ch.ethz.mxquery.opt.expr.Literal

evaluate, getIter

Methods inherited from class ch.ethz.mxquery.opt.expr.LogicalUnit

addDependency, getDependency, getDependencyName, getDependencyNb, getResult, isDependendOnEnd, isDependendOnStart, isIndexable, isLowerDependency, isLowerOrEqualDependency, setDependency, setIndexable

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, toString, wait, wait, wait

Field Detail

DEPENDENCY_NO_NO

public static final int DEPENDENCY_NO_NO

See Also:

Constant Field Values

DEPENDENCY_NO_START

public static final int DEPENDENCY_NO_START

See Also:

Constant Field Values

DEPENDENCY_NO_STARTEND

public static final int DEPENDENCY_NO_STARTEND

See Also:

Constant Field Values

DEPENDENCY_NO_END

public static final int DEPENDENCY_NO_END

See Also:

Constant Field Values

DEPENDENCY_START_START

public static final int DEPENDENCY_START_START

See Also:

Constant Field Values

DEPENDENCY_START_END

public static final int DEPENDENCY_START_END

See Also:

Constant Field Values

DEPENDENCY_START_STARTEND

public static final int DEPENDENCY_START_STARTEND

See Also:

Constant Field Values

DEPENDENCY_END_END

public static final int DEPENDENCY_END_END

See Also:

Constant Field Values

DEPENDENCY_END_STARTEND

public static final int DEPENDENCY_END_STARTEND

See Also:

Constant Field Values

DEPENDENCY_STARTEND_STARTEND

public static final int DEPENDENCY_STARTEND_STARTEND

See Also:

Constant Field Values

Constructor Detail

CompareLiteral

public CompareLiteral(XDMIterator iter,
                      int comparator,
                      int compareType,
                      ValueLiteral leftLiteral,
                      ValueLiteral rightLiteral)

Method Detail

getComparator

public int getComparator()

Returns the comparator id (based on CompareIterator constants)

Returns:

a comparator type (see ch.ethz.mxquery.model.Constants)

getCompareType

public int getCompareType()

Returns the comparator type (value, general, node based on CompareIterator constants)

Returns:

a compare type (see ch.ethz.mxquery.model.Constants)

getCompareDependency

public int getCompareDependency()

Returns the compare dependency

Returns:

one of the dependency types

getLeftLiteral

public ValueLiteral getLeftLiteral()

Returns the left part of the comparison (this part has always a lower dependency than the right part

Returns:

the first/left ValueLiteral

getRightLiteral

public ValueLiteral getRightLiteral()

Returns the left part of the comparison (this part has always a higher dependency than the right part

Returns:

the second/right ValueLiteral

compareTo

public int compareTo(java.lang.Object o)

Needed to compare literals depending on their dependencies

Specified by:

compareTo in interface java.lang.Comparable

Overrides:

compareTo in class LogicalUnit

Returns:

-1 of this logical unit is small, 0 if equal, 1 if this is greater

equals

public boolean equals(java.lang.Object obj)

Overrides:

equals in class java.lang.Object

hashCode

public int hashCode()

Overrides:

hashCode in class java.lang.Object

clone

public java.lang.Object clone()

Creates a deep copy!

Overrides:

clone in class Literal

traverse

public KXmlSerializer traverse(KXmlSerializer serializer)

Just for debugging

Specified by:

traverse in interface Traversable

Overrides:

traverse in class Literal

reset

public int reset(int level)

Description copied from class: LogicalUnit

Resets the logical unit up to a certain degree on variable dependency

Overrides:

reset in class LogicalUnit

Returns:

UNKNOWN, TRUE or FALSE

getCompareDependencyName

public static java.lang.String getCompareDependencyName(int dep)