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CoherenceTM v3.3 Copyright© 2000-2007 by Oracle Corporation |
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java.lang.Objectcom.tangosol.util.Base
com.tangosol.util.comparator.SafeComparator
public class SafeComparator
Null-safe delegating comparator. Null values are evaluated as "less then"
any non-null value. If the wrapped comparator is not specified then all
non-null values must implement the Comparable
interface.
Field Summary | |
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static SafeComparator |
INSTANCE
The trivial SafeComparator. |
protected Comparator |
m_comparator
The wrapped Comparator. |
Constructor Summary | |
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SafeComparator()
Default constructor (for ExternalizableLite and PortableObject). |
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SafeComparator(Comparator comparator)
Construct a SafeComparator delegating to the specified (wrapped) comparator. |
Method Summary | |
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int |
compare(Object o1,
Object o2)
Compares its two arguments for order. |
int |
compareEntries(QueryMap.Entry entry1,
QueryMap.Entry entry2)
Compare two entries using the underlying comparator. |
static int |
compareSafe(Comparator comparator,
Object o1,
Object o2)
Compares its two arguments for order. |
boolean |
equals(Object o)
Determine if two comparators are equal. |
Comparator |
getComparator()
Obtain the wrapped Comparator. |
int |
hashCode()
Return the hash code for this comparator. |
boolean |
isKeyComparator()
Specifies whether this comparator expects to compare keys or values. |
static boolean |
isKeyComparator(Comparator comparator)
Check whether the specified comparator expects to compare keys or values. |
void |
readExternal(DataInput in)
Restore the contents of this object by loading the object's state from the passed DataInput object. |
void |
readExternal(PofReader in)
Restore the contents of a user type instance by reading its state using the specified PofReader object. |
String |
toString()
Return a human-readable description for this Comparator. |
void |
writeExternal(DataOutput out)
Save the contents of this object by storing the object's state into the passed DataOutput object. |
void |
writeExternal(PofWriter out)
Save the contents of a POF user type instance by writing its state using the specified PofWriter object. |
Field Detail |
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public static final SafeComparator INSTANCE
protected Comparator m_comparator
Constructor Detail |
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public SafeComparator()
public SafeComparator(Comparator comparator)
comparator
- Comparator object to delegate comparison of
non-null values (optional)Method Detail |
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public int compare(Object o1, Object o2)
Comparable
interface.
compare
in interface Comparator
o1
- the first object to be comparedo2
- the second object to be compared
ClassCastException
- if the arguments' types prevent them from
being compared by this Comparator.public int compareEntries(QueryMap.Entry entry1, QueryMap.Entry entry2)
compareEntries
in interface QueryMapComparator
entry1
- the first entry to compare values from; read-onlyentry2
- the second entry to compare values from; read-only
public boolean isKeyComparator()
isKeyComparator
in interface EntryAwareComparator
public static boolean isKeyComparator(Comparator comparator)
comparator
- a Comparator to check
public Comparator getComparator()
public static int compareSafe(Comparator comparator, Object o1, Object o2)
Comparable
interface.
comparator
- a comparator to use for the comparison (optional)o1
- the first object to be comparedo2
- the second object to be compared
ClassCastException
- if the arguments are not Comparablepublic String toString()
public boolean equals(Object o)
equals
in interface Comparator
o
- the other comparator
public int hashCode()
public void readExternal(DataInput in) throws IOException
readExternal
in interface ExternalizableLite
in
- the DataInput stream to read data from in order to restore
the state of this object
IOException
- if an I/O exception occurs
NotActiveException
- if the object is not in its initial
state, and therefore cannot be deserialized intopublic void writeExternal(DataOutput out) throws IOException
writeExternal
in interface ExternalizableLite
out
- the DataOutput stream to write the state of this object to
IOException
- if an I/O exception occurspublic void readExternal(PofReader in) throws IOException
readExternal
in interface PortableObject
in
- the PofReader from which to read the object's state
IOException
- if an I/O error occurspublic void writeExternal(PofWriter out) throws IOException
writeExternal
in interface PortableObject
out
- the PofWriter to which to write the object's state
IOException
- if an I/O error occurs
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CoherenceTM v3.3 Copyright© 2000-2007 by Oracle Corporation |
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