pl.edu.agh.cast.model.attributes
Class AttributeMergePolicy

java.lang.Object
  pl.edu.agh.cast.model.attributes.AttributeMergePolicy

All Implemented Interfaces:

Serializable

Direct Known Subclasses:

AttributeMergePolicy.MergePolicyAlwaysFirst, AttributeMergePolicy.MergePolicyAlwaysSecond, AttributeMergePolicy.MergePolicyLogicalAnd, AttributeMergePolicy.MergePolicyLogicalOr

public abstract class AttributeMergePolicy
extends Object
implements Serializable

This class represents a policy of merging two values of an VisualAttribute into one. It defines a few basic policies, however custom ones may be defined by extending this class.

Author:

AGH CAST Team

See Also:

Serialized Form

Nested Class Summary

static class	AttributeMergePolicy.MergePolicyAlwaysFirst A merge policy that always returns the first value.
static class	AttributeMergePolicy.MergePolicyAlwaysSecond A merge policy that always returns the second value.
static class	AttributeMergePolicy.MergePolicyLogicalAnd A merge policy that always returns the logical conjunction (AND) of given values.
static class	AttributeMergePolicy.MergePolicyLogicalOr A merge policy that always returns the logical alternative (OR) of given values.

Field Summary

static AttributeMergePolicy	MERGE_POLICY_ALWAYS_FIRST A merge policy that always returns the first value.
static AttributeMergePolicy	MERGE_POLICY_ALWAYS_SECOND A merge policy that always returns the second value.
static AttributeMergePolicy	MERGE_POLICY_LOGICAL_AND A merge policy that always returns the logical conjunction (AND) of given values.
static AttributeMergePolicy	MERGE_POLICY_LOGICAL_OR A merge policy that always returns the logical alternative (OR) of given values.

Constructor Summary

protected

AttributeMergePolicy()

Method Summary

protected boolean	checkIfBoolean(Object firstValue, Object secondValue) Verifies if two values are of type Boolean.
boolean	equals(Object obj)
abstract String	getId() Returns the unique id of this policy.
int	hashCode()
abstract Object	mergeValues(Attribute attribute, Object firstValue, Object secondValue) Merges two Attribute values into one.
static AttributeMergePolicy	resolve(String id) Returns policy based on its id.
String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

MERGE_POLICY_ALWAYS_FIRST

public static final AttributeMergePolicy MERGE_POLICY_ALWAYS_FIRST

A merge policy that always returns the first value.

MERGE_POLICY_ALWAYS_SECOND

public static final AttributeMergePolicy MERGE_POLICY_ALWAYS_SECOND

A merge policy that always returns the second value.

MERGE_POLICY_LOGICAL_AND

public static final AttributeMergePolicy MERGE_POLICY_LOGICAL_AND

A merge policy that always returns the logical conjunction (AND) of given values. It is valid only for two values of type Boolean

MERGE_POLICY_LOGICAL_OR

public static final AttributeMergePolicy MERGE_POLICY_LOGICAL_OR

A merge policy that always returns the logical alternative (OR) of given values. It is valid only for two values of type Boolean

Constructor Detail

AttributeMergePolicy

protected AttributeMergePolicy()

Method Detail

checkIfBoolean

protected boolean checkIfBoolean(Object firstValue,
                                 Object secondValue)

Verifies if two values are of type Boolean. Helper method.

Parameters:

first -

second -

Returns:

true if types of both values are of type Boolean

getId

public abstract String getId()

Returns the unique id of this policy.

Returns:

policy id

mergeValues

public abstract Object mergeValues(Attribute attribute,
                                   Object firstValue,
                                   Object secondValue)

Merges two Attribute values into one. It is possible that the returned value will be one of the parameters, or a completely new object.

Parameters:

attribute - Attribute to merge

firstValue - first value

secondValue - second value

Returns:

an AttributeValue that is the result of merging given values according to the policy

resolve

public static final AttributeMergePolicy resolve(String id)

Returns policy based on its id.

Parameters:

id - policy id

Returns:

the policy

equals

public boolean equals(Object obj)

Overrides:

equals in class Object

See Also:

Object.equals(java.lang.Object)

toString

public String toString()

Overrides:

toString in class Object

See Also:

Object.toString()

hashCode

public int hashCode()

Overrides:

hashCode in class Object

See Also:

Object.hashCode()