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com.tangosol.util.processor
Class PropertyProcessor

java.lang.Object
com.tangosol.util.Base
com.tangosol.util.processor.AbstractProcessor
com.tangosol.util.processor.PropertyProcessor

All Implemented Interfaces:

ExternalizableLite, PortableObject, InvocableMap.EntryProcessor, java.io.Serializable

Direct Known Subclasses:

NumberIncrementor, NumberMultiplier

public abstract class PropertyProcessor

extends AbstractProcessor

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

Field Summary

protected ValueManipulator

m_manipulator The property value manipulator.

Constructor Summary

PropertyProcessor()
Default constructor (necessary for the ExternalizableLite interface).

PropertyProcessor(java.lang.String sName)
Construct a PropertyProcessor for the specified property name.

PropertyProcessor(java.lang.String sName, boolean fUseIs)
Construct a PropertyProcessor for the specified property name.

PropertyProcessor(ValueManipulator manipulator)
Construct a PropertyProcessor based for the specified ValueManipulator.

Method Summary

boolean	equals(java.lang.Object o) Compare the PropertyProcessor with another object to determine equality.
protected java.lang.Object	get(InvocableMap.Entry entry) Get the property value from the passed Entry object.
protected abstract java.lang.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(java.io.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 entry, java.lang.Object oValue) Set the property value into the passed Entry object.
java.lang.String	toString() Return a human-readable description for this PropertyProcessor.
void	writeExternal(java.io.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 interface com.tangosol.util.InvocableMap.EntryProcessor

process

Field Detail

m_manipulator

protected ValueManipulator m_manipulator

The property value manipulator.

Constructor Detail

PropertyProcessor

public PropertyProcessor()

Default constructor (necessary for the ExternalizableLite interface).

PropertyProcessor

public PropertyProcessor(java.lang.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(java.lang.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 manipulator)

Construct a PropertyProcessor based for the specified ValueManipulator.

Parameters:

manipulator - a ValueManipulator; could be null

Method Detail

get

protected java.lang.Object get(InvocableMap.Entry entry)

Get the property value from the passed Entry object.

Parameters:

entry - the Entry object

Returns:

the property value

See Also:

ValueExtractor.extract(java.lang.Object)

set

protected void set(InvocableMap.Entry entry,
                   java.lang.Object oValue)

Set the property value into the passed Entry object.

Parameters:

entry - the Entry object

oValue - a new property value

See Also:

ValueUpdater.update(java.lang.Object, java.lang.Object)

getDescription

protected abstract java.lang.String getDescription()

Returns this PropertyProcessor's description.

Returns:

this PropertyProcessor's description

equals

public boolean equals(java.lang.Object o)

Compare the PropertyProcessor with another object to determine equality.

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.

Returns:

an integer hash value for this PropertyProcessor object

toString

public java.lang.String toString()

Return a human-readable description for this PropertyProcessor.

Returns:

a String description of the PropertyProcessor

readExternal

public void readExternal(java.io.DataInput in)
                  throws java.io.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:

java.io.IOException - if an I/O exception occurs

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

writeExternal

public void writeExternal(java.io.DataOutput out)
                   throws java.io.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:

java.io.IOException - if an I/O exception occurs

readExternal

public void readExternal(PofReader in)
                  throws java.io.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:

java.io.IOException - if an I/O error occurs

writeExternal

public void writeExternal(PofWriter out)
                   throws java.io.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:

java.io.IOException - if an I/O error occurs

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