com.codemesh.terp.eval.converters
Class ToBoolean

java.lang.Object
  com.codemesh.terp.eval.converters.ToBoolean

All Implemented Interfaces:

Converter<java.lang.Boolean>

public class ToBoolean
extends java.lang.Object
implements Converter<java.lang.Boolean>

Converts various types to Booleans. This converter is registered under the ^boolean name.

Like all converters, this type supports conversion from its own target type (i.e. Boolean) and the String type. Any given string will be evaluated as an expression and the result of that evaluation will be evaluated as a boolean value. For any other type, null is returned.

Field Summary

static ToBoolean

TO_BOOLEAN An instance of the converter that can be used by clients that need to convert something to a boolean.

Constructor Summary

ToBoolean()

Method Summary

java.lang.Boolean

fromObject(java.lang.Object obj, TerpContext ctx) Converts the given object into an object of the target type.

Methods inherited from class java.lang.Object

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

Field Detail

TO_BOOLEAN

public static final ToBoolean TO_BOOLEAN

An instance of the converter that can be used by clients that need to convert something to a boolean.

Constructor Detail

ToBoolean

public ToBoolean()

Method Detail

fromObject

public java.lang.Boolean fromObject(java.lang.Object obj,
                                    TerpContext ctx)

Converts the given object into an object of the target type. Conversions can be implemented in any way that makes sense. Normally, converters will return null for null, but some converters may choose to interpret null as an indicator to return a default-initialized target object. An example of this type of conversion is the ShellExecutor. null simply indicates that no preference overrides of any kind have been provided.

Specified by:

fromObject in interface Converter<java.lang.Boolean>

Parameters:

obj - the source object.

ctx - the context in which the conversion takes place.

Returns:

an instance of the target type or null.