com.tangosol.util.processor

Class PropertyProcessor<K,V,R>

java.lang.Object

com.tangosol.util.Base

com.tangosol.util.processor.AbstractProcessor<K,V,R>

com.tangosol.util.processor.PropertyProcessor<K,V,R>

All Implemented Interfaces:

ExternalizableLite, PortableObject, InvocableMap.EntryProcessor<K,V,R>, Serializable

Direct Known Subclasses:

NumberIncrementor, NumberMultiplier

public abstract class PropertyProcessor<K,V,R>
extends AbstractProcessor<K,V,R>
implements ExternalizableLite, PortableObject

PropertyProcessor is a base class for EntryProcessor implementations that depend on a ValueManipulator.

Any concrete subclass would have to implement the methods of ExternalizableLite interface calling the appropriate super class implementations first.

A typical concrete subclass would also implement the process() method using the following pattern:

  public Object process(InvocableMap.Entry entry)
    {
    // retrieve an old property value
    Object oOldValue = get(entry);

    ... // calculate a new value and the process result
    ... // based on the old value and the processor's attributes

    if (!oNewValue.equals(oOldValue))
      {
      // set the new property value
      set(entry, oNewValue);
      }

    // return the process result
    return oResult;
    }
 

Author:

gg 2005.10.31

Nested Class Summary

Nested classes/interfaces inherited from class com.tangosol.util.Base

Base.LoggingWriter, Base.StackFrame

Field Summary

Fields

Modifier and Type	Field and Description
protected ValueManipulator<V,R>	m_manipulator The property value manipulator.

Fields inherited from class com.tangosol.util.Base

LOG_ALWAYS, LOG_DEBUG, LOG_ERR, LOG_INFO, LOG_MAX, LOG_MIN, LOG_QUIET, LOG_WARN, POWER_0, POWER_G, POWER_K, POWER_M, POWER_T, UNIT_D, UNIT_H, UNIT_M, UNIT_MS, UNIT_NS, UNIT_S, UNIT_US

Constructor Summary

Constructors

Constructor and Description
PropertyProcessor() Default constructor (necessary for the ExternalizableLite interface).
PropertyProcessor(String sName) Construct a PropertyProcessor for the specified property name.
PropertyProcessor(String sName, boolean fUseIs) Construct a PropertyProcessor for the specified property name.
PropertyProcessor(ValueManipulator<V,R> manipulator) Construct a PropertyProcessor based for the specified ValueManipulator.

Method Summary

Modifier and Type	Method and Description
boolean	equals(Object o) Compare the PropertyProcessor with another object to determine equality.
protected R	get(InvocableMap.Entry<K,V> entry) Get the property value from the passed Entry object.
protected abstract String	getDescription() Returns this PropertyProcessor's description.
int	hashCode() Determine a hash value for the PropertyProcessor object according to the general Object.hashCode() contract.
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.
protected void	set(InvocableMap.Entry<K,V> entry, R oValue) Set the property value into the passed Entry object.
String	toString() Return a human-readable description for this PropertyProcessor.
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.

Methods inherited from class com.tangosol.util.processor.AbstractProcessor

processAll

Methods inherited from class com.tangosol.util.Base

azzert, azzert, azzert, azzertFailed, breakLines, breakLines, capitalize, checkNotEmpty, checkNotNull, checkRange, computeSafeWaitTime, decimalValue, dup, dup, ensureBigDecimal, ensureClassLoader, ensureRuntimeException, ensureRuntimeException, equals, equalsDeep, err, err, err, err, err, escape, formatDateTime, getCallerStackFrame, getCommonMonitor, getCommonMonitor, getCommonMonitor, getContextClassLoader, getContextClassLoader, getDeepMessage, getErr, getLastSafeTimeMillis, getLog, getMaxDecDigits, getMaxHexDigits, getOriginalException, getOut, getProcessRandom, getRandom, getRandomBinary, getRandomBinary, getRandomString, getSafeTimeMillis, getStackFrame, getStackFrames, getStackTrace, getStackTrace, getThreadFactory, getTimeZone, getUpTimeMillis, hashCode, hexValue, indentString, indentString, isDecimal, isHex, isLogEcho, isOctal, log, log, log, log, log, makeInteger, makeLong, makeThread, mod, mod, octalValue, out, out, out, out, out, pad, parseBandwidth, parseBandwidth, parseDelimitedString, parseHex, parseHex, parseMemorySize, parseMemorySize, parsePercentage, parseTime, parseTime, parseTimeNanos, parseTimeNanos, printStackTrace, randomize, randomize, randomize, randomize, read, read, read, read, read, read, read, replace, setErr, setLog, setLogEcho, setOut, sleep, toBandwidthString, toBandwidthString, toCharEscape, toCrc, toCrc, toCrc, toCrc, toCrc, toDecString, toDelimitedString, toDelimitedString, toDelimitedString, toDelimitedString, toHex, toHex, toHexDump, toHexEscape, toHexEscape, toHexEscape, toHexEscape, toHexString, toMemorySizeString, toMemorySizeString, toQuotedCharEscape, toQuotedStringEscape, toSqlString, toString, toString, toStringEscape, toUnicodeEscape, trace, trace, trace, trace, trace, trace, trace, trace, trace, truncateString, truncateString, wait

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface com.tangosol.util.InvocableMap.EntryProcessor

process

Field Detail

m_manipulator

protected ValueManipulator<V,R> m_manipulator

The property value manipulator.

Constructor Detail

PropertyProcessor

public PropertyProcessor()

Default constructor (necessary for the ExternalizableLite interface).

PropertyProcessor

public PropertyProcessor(String sName)

Construct a PropertyProcessor for the specified property name.

This constructor assumes that the corresponding property getter will have a name of ("get" + sName) and the corresponding property setter's name will be ("set + sName).

Parameters:

sName - a property name

PropertyProcessor

public PropertyProcessor(String sName,
                         boolean fUseIs)

Construct a PropertyProcessor for the specified property name.

This constructor assumes that the corresponding property getter will have a name of either ("get" + sName) or ("is + sName) and the corresponding property setter's name will be ("set + sName).

Parameters:

sName - a property name

fUseIs - if true, the getter method will be prefixed with "is" rather than "get"

PropertyProcessor

public PropertyProcessor(ValueManipulator<V,R> manipulator)

Construct a PropertyProcessor based for the specified ValueManipulator.

Parameters:

manipulator - a ValueManipulator; could be null

Method Detail

get

protected R get(InvocableMap.Entry<K,V> entry)

Get the property value from the passed Entry object.

Parameters:

entry - the Entry object

Returns:

the property value

See Also:

ValueExtractor.extract(T)

set

protected void set(InvocableMap.Entry<K,V> entry,
                   R oValue)

Set the property value into the passed Entry object.

Parameters:

entry - the Entry object

oValue - a new property value

See Also:

ValueUpdater.update(T, U)

getDescription

protected abstract String getDescription()

Returns this PropertyProcessor's description.

Returns:

this PropertyProcessor's description

equals

public boolean equals(Object o)

Compare the PropertyProcessor with another object to determine equality.

Overrides:

equals in class Object

Returns:

true iff this PropertyProcessor and the passed object are equivalent PropertyProcessors

hashCode

public int hashCode()

Determine a hash value for the PropertyProcessor object according to the general Object.hashCode() contract.

Overrides:

hashCode in class Object

Returns:

an integer hash value for this PropertyProcessor object

toString

public String toString()

Return a human-readable description for this PropertyProcessor.

Overrides:

toString in class Object

Returns:

a String description of the PropertyProcessor

readExternal

public void readExternal(DataInput in)
                  throws IOException

Restore the contents of this object by loading the object's state from the passed DataInput object.

Specified by:

readExternal in interface ExternalizableLite

Parameters:

in - the DataInput stream to read data from in order to restore the state of this object

Throws:

IOException - if an I/O exception occurs

NotActiveException - if the object is not in its initial state, and therefore cannot be deserialized into

writeExternal

public void writeExternal(DataOutput out)
                   throws IOException

Save the contents of this object by storing the object's state into the passed DataOutput object.

Specified by:

writeExternal in interface ExternalizableLite

Parameters:

out - the DataOutput stream to write the state of this object to

Throws:

IOException - if an I/O exception occurs

readExternal

public void readExternal(PofReader in)
                  throws IOException

Restore the contents of a user type instance by reading its state using the specified PofReader object.

Specified by:

readExternal in interface PortableObject

Parameters:

in - the PofReader from which to read the object's state

Throws:

IOException - if an I/O error occurs

writeExternal

public void writeExternal(PofWriter out)
                   throws IOException

Save the contents of a POF user type instance by writing its state using the specified PofWriter object.

Specified by:

writeExternal in interface PortableObject

Parameters:

out - the PofWriter to which to write the object's state

Throws:

IOException - if an I/O error occurs