com.endeca.portal.data.functions
Class QueryFunction

java.lang.Object
  com.endeca.portal.data.functions.QueryFunction

All Implemented Interfaces:

java.io.Serializable, java.lang.Cloneable

Direct Known Subclasses:

QueryConfig, QueryFilter

public abstract class QueryFunction
extends java.lang.Object
implements java.io.Serializable, java.lang.Cloneable

The base class of all QueryFunctions. Wraps functionality for serializing and deserializing, cloning, and comparing. Refer to subclasses for specific types of functions.

Subclassing

For Semantic reasons, you should usually consider subclassing either QueryFilter or QueryConfig, not this class directly. Other than that, simply pay attention to the abstract methods in this class and your toString() implementation.

See Also:

QueryFilter, QueryConfig, Serialized Form

Field Summary

static java.lang.String

CLASS_PROPERTY

Constructor Summary

protected

QueryFunction()

Method Summary

abstract void	applyToDiscoveryServiceQuery(com.endeca.mdex.conversation.Request query) Apply this function to a Request.
QueryFunction	clone()
boolean	equals(java.lang.Object other)
boolean	equals(QueryFunction other) Compares two QueryFunction instances by checking class types and using the object's toString() method
abstract java.util.List<java.lang.reflect.Method>	getGetters() Return the list of property getters on this function.
static <T extends QueryFunction> T	getInstance(java.lang.Class<T> klass, org.json.JSONObject init) convenience function to instantiate a new function from a JSON configuration.
static <T extends QueryFunction> T	getInstance(org.json.JSONObject init)
java.lang.String	getName() Retrieve the name.
abstract java.util.List<java.lang.reflect.Method>	getSetters() Return the list of property setters on this function.
int	hashCode()
void	init(org.json.JSONObject json) Initialize this instance from a JSON configuration.
void	setName(java.lang.String name) Set the name.
org.json.JSONObject	toJSON() Construct a JSON representation of this function.
abstract java.lang.String	toString() This class' toString is abstract: all concrete subclasses are expected to provide an implementation. toString is used in comparing QueryFunction instances for equality, so if you implement a QueryFunction subclass it is important that your toString implementation be consistent and deterministic.

Methods inherited from class java.lang.Object

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

Field Detail

CLASS_PROPERTY

public static java.lang.String CLASS_PROPERTY

Constructor Detail

QueryFunction

protected QueryFunction()

Method Detail

getName

public java.lang.String getName()

Retrieve the name.

Returns:

the name

setName

public void setName(java.lang.String name)

Set the name.

Parameters:

name - the name to set

getInstance

public static <T extends QueryFunction> T getInstance(java.lang.Class<T> klass,
                                                      org.json.JSONObject init)
                                           throws java.lang.ClassNotFoundException,
                                                  java.lang.IllegalAccessException,
                                                  java.lang.InstantiationException,
                                                  org.json.JSONException,
                                                  java.lang.IllegalArgumentException,
                                                  java.lang.reflect.InvocationTargetException

convenience function to instantiate a new function from a JSON configuration.

Type Parameters:

T -

Parameters:

klass - the class of the function to initialize

init - the JSON representation of the function to initialize

Returns:

The new instance

Throws:

java.lang.ClassNotFoundException

java.lang.IllegalAccessException

java.lang.InstantiationException

org.json.JSONException

java.lang.IllegalArgumentException

java.lang.reflect.InvocationTargetException

getInstance

public static <T extends QueryFunction> T getInstance(org.json.JSONObject init)
                                           throws org.json.JSONException,
                                                  java.lang.ClassNotFoundException,
                                                  java.lang.IllegalArgumentException,
                                                  java.lang.IllegalAccessException,
                                                  java.lang.InstantiationException,
                                                  java.lang.reflect.InvocationTargetException

Throws:

org.json.JSONException

java.lang.ClassNotFoundException

java.lang.IllegalArgumentException

java.lang.IllegalAccessException

java.lang.InstantiationException

java.lang.reflect.InvocationTargetException

init

public void init(org.json.JSONObject json)
          throws org.json.JSONException

Initialize this instance from a JSON configuration. This method calls the String setters for each attribute defined in the JSON configuration. If there is no String setter, the attribute is skipped.

Parameters:

json - the JSON configuration

Throws:

java.lang.IllegalArgumentException

java.lang.IllegalAccessException

org.json.JSONException

See Also:

toJSON()

applyToDiscoveryServiceQuery

public abstract void applyToDiscoveryServiceQuery(com.endeca.mdex.conversation.Request query)
                                           throws QueryFunctionUnsupportedException

Apply this function to a Request. Must be implemented by subclass.

Parameters:

query -

Throws:

QueryFunctionUnsupportedException

getGetters

public abstract java.util.List<java.lang.reflect.Method> getGetters()

Return the list of property getters on this function. Must be implemented by subclass. Required for correct JSON serialization/deserialization support. For most subclasses, implementing this method should be simple, as long as your getter methods follow standard Java naming conventions (e.g. "getPropertyName()"). All you should need to write is:

 private static List getters = Reflection.getGetters(MyFunctionClass.class);
 \@Override
 public List getGetters() {
        return getters;
 }
 

Returns:

the list of getters

getSetters

public abstract java.util.List<java.lang.reflect.Method> getSetters()

Return the list of property setters on this function. Must be implemented by subclass. Required for correct JSON serialization/deserialization support. For most subclasses, implementing this method should be simple, as long as your setter methods follow standard Java naming conventions (e.g. "setPropertyName(PropertyType)"). All you should need to write is:

 private static List setters = Reflection.getSetters(MyFunctionClass.class);
 \@Override
 public List getSetters() {
        return setters;
 }
 

Returns:

the list of setters

toJSON

public org.json.JSONObject toJSON()

Construct a JSON representation of this function.

Returns:

The JSON represenation

See Also:

init(JSONObject)

toString

public abstract java.lang.String toString()

This class' toString is abstract: all concrete subclasses are expected to provide an implementation. toString is used in comparing QueryFunction instances for equality, so if you implement a QueryFunction subclass it is important that your toString implementation be consistent and deterministic.

Overrides:

toString in class java.lang.Object

clone

public QueryFunction clone()

Overrides:

clone in class java.lang.Object

equals

public boolean equals(java.lang.Object other)

Overrides:

equals in class java.lang.Object

equals

public boolean equals(QueryFunction other)

Compares two QueryFunction instances by checking class types and using the object's toString() method

Parameters:

other -

Returns:

hashCode

public int hashCode()

Overrides:

hashCode in class java.lang.Object