com.whitestein.lsps.vaadin.forms.datasource

Class ValueProvider.AbstractValueProvider

java.lang.Object

com.whitestein.lsps.vaadin.forms.datasource.ValueProvider.AbstractValueProvider

All Implemented Interfaces:

ValueProvider, Serializable

Direct Known Subclasses:

LspsValueProvider, ValueProvider.ToStringValueProvider, ValueProvider.ValueKeepingValueProvider

Enclosing interface:

ValueProvider

public abstract static class ValueProvider.AbstractValueProvider
extends Object
implements ValueProvider

Extend this to get basic value provider functionality out of the box - return class, comparator and memoization.

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from interface com.whitestein.lsps.vaadin.forms.datasource.ValueProvider

ValueProvider.AbstractValueProvider, ValueProvider.DelegatingValueProvider, ValueProvider.LocalizingValueProvider, ValueProvider.MemoizingValueProvider, ValueProvider.ToStringValueProvider, ValueProvider.ValueKeepingValueProvider

Constructor Summary

Constructors

Constructor and Description
AbstractValueProvider()

Method Summary

Modifier and Type	Method and Description
com.google.common.collect.Ordering<Object>	getComparator() Returns comparator which compares input objects based on values provided by this value provider.
Class<?>	getReturnJavaClass(Namespace namespace) Java class of objects provided by ValueProvider.call(Object).
ValueProvider	memoize() Returns a value provider which caches (memoizes) pairs of input-result of ValueProvider.call(Object) indefinitely.

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.whitestein.lsps.vaadin.forms.datasource.ValueProvider

call, getDefinition, getValueType

Constructor Detail

AbstractValueProvider

public AbstractValueProvider()

Method Detail

getReturnJavaClass

public Class<?> getReturnJavaClass(Namespace namespace)

Description copied from interface: ValueProvider

Java class of objects provided by ValueProvider.call(Object). If in doubt, return Object.class.

Specified by:

getReturnJavaClass in interface ValueProvider

Parameters:

namespace - calling namespace, not null.

Returns:

the java class of returned objects, not null.

getComparator

public com.google.common.collect.Ordering<Object> getComparator()

Description copied from interface: ValueProvider

Returns comparator which compares input objects based on values provided by this value provider. The values provided by ValueProvider.call(Object) must be Comparable!

Specified by:

getComparator in interface ValueProvider

Returns:

null-first ordering which calls ValueProvider.call(Object) on every input object and sorts the objects by comparing output values. Never null.

memoize

public ValueProvider memoize()

Description copied from interface: ValueProvider

Returns a value provider which caches (memoizes) pairs of input-result of ValueProvider.call(Object) indefinitely.

Specified by:

memoize in interface ValueProvider

Returns:

a memoizing value provider, not null.