org.apache.ambari.server.collections.functors

Class ContainsPredicate

java.lang.Object

org.apache.ambari.server.collections.Predicate

org.apache.ambari.server.collections.functors.ContainsPredicate

All Implemented Interfaces:

org.apache.commons.collections.Predicate

public class ContainsPredicate
extends Predicate

ContainsPredicate is a predicate implementation testing whether a string value exists within some set of strings.

It it expected that the data supplied to the evaluate(Object) method is as Set of Strings retrieved from a context (a Map of keys to values, where each value can be an explicit value or a Map of values creating a tree structure.

Field Summary

Fields

Modifier and Type	Field and Description
static String	NAME The name of this Predicate implementation

Constructor Summary

Constructors

Constructor and Description
ContainsPredicate(ContextTransformer transformer, String value) Constructor

Method Summary

Modifier and Type	Method and Description
boolean	equals(Object obj)
boolean	evaluate(Object o)
protected boolean	evaluateTransformedData(Object data) Abstract method used internally to process the evaluate(Object) logic after the input data is transformed.
static ContainsPredicate	fromMap(Map<String,Object> map) Creates a new ContainsPredicate using the given Map of data.
String	getContextKey() Gets the context key assigned to the ContextTransformer.
ContextTransformer	getTransformer() Gets the Transformer
String	getValue() Gets the test value
int	hashCode()
void	setTransformer(ContextTransformer transformer) Sets the Transformer
Map<String,Object>	toMap() Serialize this Predicate to a Map

Methods inherited from class org.apache.ambari.server.collections.Predicate

getName, toJSON

Methods inherited from class java.lang.Object

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

Field Detail

NAME

public static final String NAME

The name of this Predicate implementation

See Also:

Constant Field Values

Constructor Detail

ContainsPredicate

public ContainsPredicate(ContextTransformer transformer,
                         String value)

Constructor

Parameters:

transformer - the ContextTransformer configured with the context key to find

value - the value to test

Method Detail

fromMap

public static ContainsPredicate fromMap(Map<String,Object> map)

Creates a new ContainsPredicate using the given Map of data.

It is expected that the map contains a single Map.Entry where the key name is "contains" and the value is a Collection of 2 Strings. The first value should be the key to use when retrieving data from the context, which should resolve to a Set of Strings (or null). The second value should be the value to check for existing in the relevant set.

Returns:

a new ContainsPredicate

getValue

public String getValue()

Gets the test value

Returns:

a string

evaluateTransformedData

protected boolean evaluateTransformedData(Object data)

Abstract method used internally to process the evaluate(Object) logic after the input data is transformed.

Parameters:

data - the transformed data to use

Returns:

the result of the evaluation (true, false)

See Also:

Predicate.evaluate(Object)

toMap

public Map<String,Object> toMap()

Description copied from class: Predicate

Serialize this Predicate to a Map

Specified by:

toMap in class Predicate

Returns:

a Map

hashCode

public int hashCode()

equals

public boolean equals(Object obj)

getTransformer

public ContextTransformer getTransformer()

Gets the Transformer

Returns:

the assigned ContextTransformer

setTransformer

public void setTransformer(ContextTransformer transformer)

Sets the Transformer

Parameters:

transformer - a ContextTransformer

getContextKey

public String getContextKey()

Gets the context key assigned to the ContextTransformer.

This key is used to identify which value from the context a passed to the Predicate.evaluate(Object) method

Returns:

a key name

evaluate

public boolean evaluate(Object o)