org.apache.felix.service.command
Interface Converter

All Known Implementing Classes:

CommandSessionImpl

public interface Converter

A converter is a service that can help create specific object types from a string, and vice versa.

The shell is capable of coercing arguments to the their proper type. However, sometimes commands require extra help to do this conversion. This service can implement a converter for a number of types.

The command shell will rank these services in order of service.ranking and will then call them until one of the converters succeeds.

Field Summary

static String	CONVERTER_CLASSES This property is a string, or array of strings, and defines the classes or interfaces that this converter recognizes.
static int	INSPECT Print the object in detail.
static int	LINE Print the object as a row in a table.
static int	PART Print the value in a small format so that it is identifiable.

Method Summary

Object	convert(Class<?> desiredType, Object in) Convert an object to the desired type.
CharSequence	format(Object target, int level, Converter escape) Convert an objet to a CharSequence object in the requested format.

Field Detail

CONVERTER_CLASSES

static final String CONVERTER_CLASSES

This property is a string, or array of strings, and defines the classes or interfaces that this converter recognizes. Recognized classes can be converted from a string to a class and they can be printed in 3 different modes.

See Also:

Constant Field Values

INSPECT

static final int INSPECT

Print the object in detail. This can contain multiple lines.

See Also:

Constant Field Values

LINE

static final int LINE

Print the object as a row in a table. The columns should align for multiple objects printed beneath each other. The print may run over multiple lines but must not end in a CR.

See Also:

Constant Field Values

PART

static final int PART

Print the value in a small format so that it is identifiable. This printed format must be recognizable by the conversion method.

See Also:

Constant Field Values

Method Detail

convert

Object convert(Class<?> desiredType,
               Object in)
               throws Exception

Convert an object to the desired type.

Return null if the conversion can not be done. Otherwise return and object that extends the desired type or implements it.

Parameters:

desiredType - The type that the returned object can be assigned to

in - The object that must be converted

Returns:

An object that can be assigned to the desired type or null.

Throws:

Exception

format

CharSequence format(Object target,
                    int level,
                    Converter escape)
                    throws Exception

Convert an objet to a CharSequence object in the requested format. The format can be INSPECT, LINE, or PART. Other values must throw IllegalArgumentException.

Parameters:

target - The object to be converted to a String

level - One of INSPECT, LINE, or PART.

escape - Use this object to format sub ordinate objects.

Returns:

A printed object of potentially multiple lines

Throws:

Exception