Package net.sf.saxon.sort
Class ComparableAtomicValueComparer
- java.lang.Object
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- net.sf.saxon.sort.ComparableAtomicValueComparer
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- All Implemented Interfaces:
java.io.Serializable
,AtomicComparer
- Direct Known Subclasses:
DecimalSortComparer
public class ComparableAtomicValueComparer extends java.lang.Object implements AtomicComparer
A comparer for comparing two "ordinary" atomic values, where the values implement the Comparable interface and the equals() method with the appropriate XPath semantics. This rules out use of collations, conversion of untyped atomic values, and context dependencies such as implicit timezone.- See Also:
- Serialized Form
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Constructor Summary
Constructors Modifier Constructor Description protected
ComparableAtomicValueComparer()
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Method Summary
All Methods Static Methods Instance Methods Concrete Methods Modifier and Type Method Description int
compareAtomicValues(AtomicValue a, AtomicValue b)
Compare two AtomicValue objects according to the rules for their data type.boolean
comparesEqual(AtomicValue a, AtomicValue b)
Compare two AtomicValue objects for equality according to the rules for their data type.ComparisonKey
getComparisonKey(AtomicValue a)
Get a comparison key for an object.static ComparableAtomicValueComparer
getInstance()
Get the singleton instance of this classAtomicComparer
provideContext(XPathContext context)
Supply the dynamic context in case this is needed for the comparison
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Method Detail
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getInstance
public static ComparableAtomicValueComparer getInstance()
Get the singleton instance of this class- Returns:
- the singleton instance of this class
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provideContext
public AtomicComparer provideContext(XPathContext context)
Supply the dynamic context in case this is needed for the comparison- Specified by:
provideContext
in interfaceAtomicComparer
- Parameters:
context
- the dynamic evaluation context- Returns:
- either the original AtomicComparer, or a new AtomicComparer in which the context is known. The original AtomicComparer is not modified
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compareAtomicValues
public int compareAtomicValues(AtomicValue a, AtomicValue b)
Compare two AtomicValue objects according to the rules for their data type. UntypedAtomic values are compared as if they were strings; if different semantics are wanted, the conversion must be done by the caller.- Specified by:
compareAtomicValues
in interfaceAtomicComparer
- Parameters:
a
- the first object to be compared. This must be an AtomicValue and it must implement Comparable with context-free XPath comparison semanticsb
- the second object to be compared. This must be an AtomicValue and it must implement Comparable with context-free XPath comparison semantics- Returns:
- <0 if a0 if a>b
- Throws:
java.lang.ClassCastException
- if the objects are not comparable
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comparesEqual
public boolean comparesEqual(AtomicValue a, AtomicValue b)
Compare two AtomicValue objects for equality according to the rules for their data type. UntypedAtomic values are compared by converting to the type of the other operand.- Specified by:
comparesEqual
in interfaceAtomicComparer
- Parameters:
a
- the first object to be compared. This must be an AtomicValue and it must implement equals() with context-free XPath comparison semanticsb
- the second object to be compared. This must be an AtomicValue and it must implement equals() with context-free XPath comparison semantics- Returns:
- true if the values are equal, false if not
- Throws:
java.lang.ClassCastException
- if the objects are not comparable
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getComparisonKey
public ComparisonKey getComparisonKey(AtomicValue a)
Get a comparison key for an object. This must satisfy the rule that if two objects are equal, then their comparison keys are equal, and vice versa. There is no requirement that the comparison keys should reflect the ordering of the underlying objects.- Specified by:
getComparisonKey
in interfaceAtomicComparer
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