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Java Source Code / Java Documentation » XML » XPath Saxon » net.sf.saxon.sort 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


java.lang.Object
   net.sf.saxon.sort.AtomicComparer

AtomicComparer
public class AtomicComparer implements Comparator,java.io.Serializable(Code)
A Comparator used for comparing atomic values of arbitrary item types. It encapsulates a Collator that is used when the values to be compared are strings. It also supports a separate method for testing equality of items, which can be used for data types that are not ordered.
author:
   Michael H. Kay



Constructor Summary
public  AtomicComparer(Comparator collator, XPathContext conversion)
    
public  AtomicComparer(Comparator collator, Configuration config)
    

Method Summary
public  intcompare(Object a, Object b)
     Compare two AtomicValue objects according to the rules for their data type.
public  booleancomparesEqual(Object a, Object b)
     Compare two AtomicValue objects for equality according to the rules for their data type.
public  ObjectgetComparisonKey(Object a)
     Get a comparison key for an object.


Constructor Detail
AtomicComparer
public AtomicComparer(Comparator collator, XPathContext conversion)(Code)
Create an AtomicComparer
Parameters:
  collator - the collation to be used
Parameters:
  conversion - a context, used when converting untyped atomic values to the target type.



AtomicComparer
public AtomicComparer(Comparator collator, Configuration config)(Code)




Method Detail
compare
public int compare(Object a, Object b)(Code)
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.
Parameters:
  a - the first object to be compared. It is intended that this should be an instanceof AtomicValue, though this restriction is not enforced. If it is a StringValue, thecollator is used to compare the values, otherwise the value must implement the java.util.Comparableinterface.
Parameters:
  b - the second object to be compared. This must be comparable with the first object: forexample, if one is a string, they must both be strings. <0 if a0 if a>b
throws:
  ClassCastException - if the objects are not comparable



comparesEqual
public boolean comparesEqual(Object a, Object b)(Code)
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.
Parameters:
  a - the first object to be compared. It is intended that this should be an instanceof AtomicValue, though this restriction is not enforced. If it is a StringValue, thecollator is used to compare the values, otherwise the value must implement the equals() method.
Parameters:
  b - the second object to be compared. This must be comparable with the first object: forexample, if one is a string, they must both be strings. <0 if a0 if a>b
throws:
  ClassCastException - if the objects are not comparable



getComparisonKey
public Object getComparisonKey(Object a)(Code)
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.



Methods inherited from java.lang.Object
native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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