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
,java.util.Comparator
,AtomicComparer
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 Constructor Description ComparableAtomicValueComparer()
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description int
compare(java.lang.Object a, java.lang.Object 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.
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Method Detail
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compare
public int compare(java.lang.Object a, java.lang.Object 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:
compare
in interfaceAtomicComparer
- Specified by:
compare
in interfacejava.util.Comparator
- Parameters:
a
- the first object to be compared. It is intended that this should be an instance of AtomicValue, though this restriction is not enforced. If it is a StringValue, the collator is used to compare the values, otherwise the value must implement the java.util.Comparable interface.b
- the second object to be compared. This must be comparable with the first object: for example, if one is a string, they must both be strings.- 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. It is intended that this should be an instance of AtomicValue, though this restriction is not enforced. If it is a StringValue, the collator is used to compare the values, otherwise the value must implement the equals() method.b
- the second object to be compared. This must be comparable with the first object: for example, if one is a string, they must both be strings.- 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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