com.whitestein.lsps.vaadin.forms.datasource

Class ValueProvider.DelegatingValueProvider

java.lang.Object

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

All Implemented Interfaces:

ValueProvider, Serializable

Direct Known Subclasses:

ValueProvider.LocalizingValueProvider, ValueProvider.MemoizingValueProvider

Enclosing interface:

ValueProvider

public static class ValueProvider.DelegatingValueProvider
extends Object
implements ValueProvider

Decorator pattern - delegates all calls to delegate.

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

Field Summary

Fields

Modifier and Type	Field and Description
protected ValueProvider	delegate

Constructor Summary

Constructors

Constructor and Description
DelegatingValueProvider(ValueProvider delegate)

Method Summary

Modifier and Type	Method and Description
Object	call(Object input) Provides value for given row data object.
com.google.common.collect.Ordering<Object>	getComparator() Returns comparator which compares input objects based on values provided by this value provider.
RecordHolder	getDefinition() Gets the LSPS object counterpart of this value provider.
Class<?>	getReturnJavaClass(Namespace namespace) Java class of objects provided by ValueProvider.call(Object).
Type	getValueType(Namespace namespace) Returns the value type provided by this provider (by calls to ValueProvider.call(Object).
ValueProvider	memoize() Returns a value provider which caches (memoizes) pairs of input-result of ValueProvider.call(Object) indefinitely.
String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

delegate

protected final ValueProvider delegate

Constructor Detail

DelegatingValueProvider

public DelegatingValueProvider(ValueProvider delegate)

Method Detail

getDefinition

public RecordHolder getDefinition()

Description copied from interface: ValueProvider

Gets the LSPS object counterpart of this value provider.

Specified by:

getDefinition in interface ValueProvider

Returns:

definition object, may be null if there is no counterpart.

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.

getValueType

public Type getValueType(Namespace namespace)

Description copied from interface: ValueProvider

Returns the value type provided by this provider (by calls to ValueProvider.call(Object). When in doubt, return SimpleType.OBJECT.

Specified by:

getValueType in interface ValueProvider

Parameters:

namespace - calling namespace, not null.

Returns:

the type, not null.

call

public Object call(Object input)

Description copied from interface: ValueProvider

Provides value for given row data object.

Specified by:

call in interface ValueProvider

Parameters:

input - the input object, mostly RecordHolder, may be null.

Returns:

cell value, mostly String, may be 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.

toString

public String toString()

Overrides:

toString in class Object