com.vaadin.shared.ui.dnd.criteria

Class Criterion

java.lang.Object

com.vaadin.shared.ui.dnd.criteria.Criterion

All Implemented Interfaces:

Serializable

public class Criterion
extends Object
implements Serializable

Stores parameters for the drag and drop acceptance criterion defined using the criteria API.

When data is dragged over a drop target, the value here is compared to the payload added in DropTargetExtension with same key and value type.

Since:

8.1

Author:

Vaadin Ltd

See Also:

Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	Criterion.Match Declares whether all or any of the given criteria should match when compared against the payload.

Constructor Summary

Constructors

Constructor and Description
Criterion(String key, ComparisonOperator operator, double value) Creates a criterion object.
Criterion(String key, ComparisonOperator operator, int value) Creates a criterion object.
Criterion(String key, String value) Creates a criterion object with the default comparison operator ComparisonOperator.EQUALS.

Method Summary

Modifier and Type	Method and Description
String	getKey() Gets the key of the payload to be compared
ComparisonOperator	getOperator() Gets the comparison operator.
String	getValue() Gets the value of the payload to be compared
Payload.ValueType	getValueType() Gets the type of the payload value to be compared
boolean	resolve(Collection<Payload> payloadCollection) Compares this criterion's value to the given payload's value and returns whether the result matches the criterion's operator.

Methods inherited from class java.lang.Object

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

Constructor Detail

Criterion

public Criterion(String key,
                 String value)

Creates a criterion object with the default comparison operator ComparisonOperator.EQUALS.

Parameters:

key - key of the payload to be compared

value - value of the payload to be compared

Criterion

public Criterion(String key,
                 ComparisonOperator operator,
                 int value)

Creates a criterion object.

Parameters:

key - key of the payload to be compared

operator - comparison operator

value - value of the payload to be compared

Criterion

public Criterion(String key,
                 ComparisonOperator operator,
                 double value)

Creates a criterion object.

Parameters:

key - key of the payload to be compared

operator - comparison operator

value - value of the payload to be compared

Method Detail

getKey

public String getKey()

Gets the key of the payload to be compared

Returns:

key of the payload to be compared

getValue

public String getValue()

Gets the value of the payload to be compared

Returns:

value of the payload to be compared

getValueType

public Payload.ValueType getValueType()

Gets the type of the payload value to be compared

Returns:

type of the payload value to be compared

getOperator

public ComparisonOperator getOperator()

Gets the comparison operator.

Returns:

operator to be used when comparing payload value with criterion

resolve

public boolean resolve(Collection<Payload> payloadCollection)

Compares this criterion's value to the given payload's value and returns whether the result matches the criterion's operator. The comparison is done with the payload whose key and value type match the criterion's key and value type.

Parameters:

payloadCollection - collection of payloads to compare the criterion against

Returns:

false if there exists a payload in the collection with the same key and value type and it doesn't match the criterion, true otherwise