com.asakusafw.windgate.core.util

Class SafeCloser<T extends Closeable>

java.lang.Object

com.asakusafw.windgate.core.util.SafeCloser<T>

Type Parameters:

T - the target Closeable

All Implemented Interfaces:

Closeable, AutoCloseable

public class SafeCloser<T extends Closeable>
extends Object
implements Closeable

Closes objects safely.

Since:

0.8.0

Constructor Summary

Constructors

Constructor and Description
SafeCloser() Creates a new empty instance.
SafeCloser(T value) Creates a new instance with target Closeable.

Method Summary

Modifier and Type	Method and Description
void	close()
T	get() Returns the target object.
protected void	handle(IOException exception) Handles an exception while closing the target object.
void	set(T newValue) Sets the target object.

Methods inherited from class java.lang.Object

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

Constructor Detail

SafeCloser

public SafeCloser()

Creates a new empty instance.

SafeCloser

public SafeCloser(T value)

Creates a new instance with target Closeable.

Parameters:

value - the target object (nullable)

Method Detail

get

public T get()

Returns the target object.

Returns:

the target object

Throws:

IllegalStateException - if no objects were set

set

public void set(T newValue)

Sets the target object.

Parameters:

newValue - the target object

Throws:

IllegalStateException - if the target object was already set

close

public void close()
           throws IOException

Specified by:

close in interface Closeable

Specified by:

close in interface AutoCloseable

Throws:

IOException

handle

protected void handle(IOException exception)
               throws IOException

Handles an exception while closing the target object.

Parameters:

exception - the occurred exception

Throws:

IOException - if the exception was re-thrown