net.sf.mmm.util.value.impl

Class AbstractValueConverterToContainer<CONTAINER>

java.lang.Object

net.sf.mmm.util.component.base.AbstractComponent

net.sf.mmm.util.value.base.AbstractValueConverter<SOURCE,TARGET>

net.sf.mmm.util.value.base.AbstractRecursiveValueConverter<Object,CONTAINER>

net.sf.mmm.util.value.impl.AbstractValueConverterToContainer<CONTAINER>

Type Parameters:

CONTAINER - is the generic type of the container.

All Implemented Interfaces:

SimpleValueConverter<Object,CONTAINER>, ValueConverter<Object,CONTAINER>

Direct Known Subclasses:

AbstractConverterToArray, ValueConverterToCollection, ValueConverterToMap

@Singleton
 @Named
public abstract class AbstractValueConverterToContainer<CONTAINER>
extends AbstractRecursiveValueConverter<Object,CONTAINER>

This is the abstract base-implementation of a ValueConverter that converts an Object to a container type. A container type is an array, Collection or Map. It supports objects given as CharSequence (e.g. String), Collection, or array. If a value is given as CharSequence it will be parsed as comma-separated values. An individual value can be escaped by enclosing it with "<{[" and "]}>" so it can itself contain the separator character.
Here are some examples:

value	target-type	result
"123"	List<Integer>	{123}
"1, 2,3"	int[]	{1,2,3}
"a, <{[b,c,d]}>,e"	List<List<Character>>	{{'a'},{'b','c','d'},{'e'}}
"42=true,84=false"	Map<Integer, Boolean>	{42->true, 84->false}

Since:

2.0.0

Author:

Joerg Hohwiller (hohwille at users.sourceforge.net)

Field Summary

Fields

Modifier and Type	Field and Description
private CollectionFactoryManager	collectionFactoryManager
protected static String	ELEMENT_ESCAPE_END The suffix used to escape an element (that may contain ELEMENT_SEPARATOR).
protected static String	ELEMENT_ESCAPE_START The prefix used to escape an element (that may contain ELEMENT_SEPARATOR).
protected static char	ELEMENT_SEPARATOR The character used to separate the element of the collection.

Constructor Summary

Constructors

Constructor and Description
AbstractValueConverterToContainer() The constructor.

Method Summary

Modifier and Type	Method and Description
<T extends CONTAINER> T	convert(Object value, Object valueSource, GenericType<T> targetType) This method converts the given pojo to the <TARGET>-type.
protected abstract void	convertContainerEntry(Object element, int index, CONTAINER container, Object valueSource, GenericType<? extends CONTAINER> targetType, Object value) This method converts a single entry of a container.
protected <T extends CONTAINER> T	convertFromArray(Object arrayValue, Object valueSource, GenericType<T> targetType) This method performs the conversion for array values.
protected <T extends CONTAINER> T	convertFromCollection(Collection collectionValue, Object valueSource, GenericType<T> targetType) This method performs the conversion for Collection values.
protected <T extends CONTAINER> T	convertFromString(String stringValue, Object valueSource, GenericType<T> targetType) This method performs the conversion for String values.
protected abstract <T extends CONTAINER> T	createContainer(GenericType<T> targetType, int length) This method creates the according container for the given containerType.
protected void	doInitialize()
protected CollectionFactoryManager	getCollectionFactoryManager()
Class<Object>	getSourceType() This the type of the value accepted by this converter.
void	setCollectionFactoryManager(CollectionFactoryManager collectionFactoryManager)

Methods inherited from class net.sf.mmm.util.value.base.AbstractRecursiveValueConverter

getComposedValueConverter, setComposedValueConverter

Methods inherited from class net.sf.mmm.util.value.base.AbstractValueConverter

convert, getReflectionUtil, setReflectionUtil

Methods inherited from class net.sf.mmm.util.component.base.AbstractComponent

doInitialized, getInitializationState, initialize

Methods inherited from class java.lang.Object

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

Methods inherited from interface net.sf.mmm.util.value.api.ValueConverter

getTargetType

Field Detail

ELEMENT_SEPARATOR

protected static final char ELEMENT_SEPARATOR

The character used to separate the element of the collection.

See Also:

Constant Field Values

ELEMENT_ESCAPE_START

protected static final String ELEMENT_ESCAPE_START

The prefix used to escape an element (that may contain ELEMENT_SEPARATOR).

See Also:

Constant Field Values

ELEMENT_ESCAPE_END

protected static final String ELEMENT_ESCAPE_END

The suffix used to escape an element (that may contain ELEMENT_SEPARATOR).

See Also:

Constant Field Values

collectionFactoryManager

private CollectionFactoryManager collectionFactoryManager

Constructor Detail

AbstractValueConverterToContainer

public AbstractValueConverterToContainer()

The constructor.

Method Detail

getCollectionFactoryManager

protected CollectionFactoryManager getCollectionFactoryManager()

Returns:

the instance of CollectionFactoryManager to use.

setCollectionFactoryManager

@Inject
public void setCollectionFactoryManager(CollectionFactoryManager collectionFactoryManager)

Parameters:

collectionFactoryManager - is the CollectionFactoryManager to set

doInitialize

protected void doInitialize()

Overrides:

doInitialize in class AbstractRecursiveValueConverter<Object,CONTAINER>

getSourceType

public Class<Object> getSourceType()

Description copied from interface: ValueConverter

This the type of the value accepted by this converter. Use Object if you want to accept any value. A very common source-type is String.

Returns:

the source-type.

convert

public <T extends CONTAINER> T convert(Object value,
                                       Object valueSource,
                                       GenericType<T> targetType)

Description copied from interface: ValueConverter

This method converts the given pojo to the <TARGET>-type.

Type Parameters:

T - is the generic type of targetClass.

Parameters:

value - is the value to convert.

valueSource - describes the source of the value. This may be the filename where the value was read from, an XPath where the value was located in an XML document, etc. It is used in exceptions thrown if something goes wrong. This will help to find the problem easier.

targetType - is the GenericType to convert the value to. It is potentially generic and therefore contains more detailed information than a Class. E.g. the targetType could be java.util.List<Long>. This could help e.g. if the value is a string like "2, 47, 4252525".

Returns:

the converted value or null if the conversion is NOT possible. The returned value has to be an instance of the given targetType.

convertFromCollection

protected <T extends CONTAINER> T convertFromCollection(Collection collectionValue,
                                                        Object valueSource,
                                                        GenericType<T> targetType)

This method performs the conversion for Collection values.

Type Parameters:

T - is the generic type of targetType.

Parameters:

collectionValue - is the Collection value to convert.

valueSource - describes the source of the value or null if NOT available.

targetType - is the target-type to convert to.

Returns:

the converted container.

convertFromString

protected <T extends CONTAINER> T convertFromString(String stringValue,
                                                    Object valueSource,
                                                    GenericType<T> targetType)

This method performs the conversion for String values.

Type Parameters:

T - is the generic type of targetType.

Parameters:

stringValue - is the String value to convert.

valueSource - describes the source of the value or null if NOT available.

targetType - is the target-type to convert to.

Returns:

the converted container.

convertFromArray

protected <T extends CONTAINER> T convertFromArray(Object arrayValue,
                                                   Object valueSource,
                                                   GenericType<T> targetType)

This method performs the conversion for array values.

Type Parameters:

T - is the generic type of targetType.

Parameters:

arrayValue - is the array value to convert.

valueSource - describes the source of the value or null if NOT available.

targetType - is the target-type to convert to.

Returns:

the converted container.

convertContainerEntry

protected abstract void convertContainerEntry(Object element,
                                              int index,
                                              CONTAINER container,
                                              Object valueSource,
                                              GenericType<? extends CONTAINER> targetType,
                                              Object value)

This method converts a single entry of a container.

Parameters:

element - is the single entry (element) of the container to convert.

index - is the index of the given element in the order of occurrence.

container - is the current container where to add the given element as entry.

valueSource - describes the source of the value or null if NOT available.

targetType - is the target-type to convert to.

value - is the original value to convert.

createContainer

protected abstract <T extends CONTAINER> T createContainer(GenericType<T> targetType,
                                                           int length)

This method creates the according container for the given containerType.

Type Parameters:

T - is the generic type of targetType.

Parameters:

targetType - is the GenericType of the container.

length - is the length (or capacity) of the container to create.

Returns:

the container instance.