Package org.geotools.util.decorate
Class AbstractDecorator<D>
- Object
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- AbstractDecorator<D>
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- All Implemented Interfaces:
Serializable
,Wrapper
,Wrapper
- Direct Known Subclasses:
DecoratingDataStore
public class AbstractDecorator<D> extends Object implements Wrapper, Serializable
Generic delegating base class. Provides the following features:- null check for the delegate object
- direct forwarding of
equals(Object)
,hashCode()
andtoString()
to the delegate - implements the Wrapper interface for programmatic extraction
- See Also:
- Serialized Form
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Constructor Summary
Constructors Constructor Description AbstractDecorator(D delegate)
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description boolean
equals(Object obj)
int
hashCode()
boolean
isWrapperFor(Class<?> iface)
Returns true if this either implements the interface argument or is directly or indirectly a wrapper for an object that does.String
toString()
<T> T
unwrap(Class<T> iface)
Returns an object that implements the given interface to allow access to non-standard methods, or standard methods not exposed by the proxy.
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Field Detail
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delegate
protected D delegate
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Constructor Detail
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AbstractDecorator
public AbstractDecorator(D delegate)
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Method Detail
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isWrapperFor
public boolean isWrapperFor(Class<?> iface)
Description copied from interface:Wrapper
Returns true if this either implements the interface argument or is directly or indirectly a wrapper for an object that does. Returns false otherwise. If this implements the interface then return true, else if this is a wrapper then return the result of recursively callingisWrapperFor
on the wrapped object. If this does not implement the interface and is not a wrapper, return false. This method should be implemented as a low-cost operation compared tounwrap
so that callers can use this method to avoid expensiveunwrap
calls that may fail. If this method returns true then callingunwrap
with the same argument should succeed.- Specified by:
isWrapperFor
in interfaceWrapper
- Specified by:
isWrapperFor
in interfaceWrapper
- Parameters:
iface
- a Class defining an interface.- Returns:
- true if this implements the interface or directly or indirectly wraps an object that does.
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unwrap
public <T> T unwrap(Class<T> iface) throws IllegalArgumentException
Description copied from interface:Wrapper
Returns an object that implements the given interface to allow access to non-standard methods, or standard methods not exposed by the proxy.If the receiver implements the interface then the result is the receiver or a proxy for the receiver. If the receiver is a wrapper and the wrapped object implements the interface then the result is the wrapped object or a proxy for the wrapped object. Otherwise return the the result of calling
unwrap
recursively on the wrapped object or a proxy for that result. If the receiver is not a wrapper and does not implement the interface, then anIllegalArgumentException
is thrown.- Specified by:
unwrap
in interfaceWrapper
- Specified by:
unwrap
in interfaceWrapper
- Parameters:
iface
- A Class defining an interface that the result must implement.- Returns:
- an object that implements the interface. May be a proxy for the actual implementing object.
- Throws:
IllegalArgumentException
- If no object found that implements the interface
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