Package com.apple.foundationdb.record.lucene.codec

Class LazyCloseable<T extends Closeable>

java.lang.Object

com.apple.foundationdb.record.lucene.codec.LazyCloseable<T>

Type Parameters:

T - the value opened

All Implemented Interfaces:

Closeable, AutoCloseable

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

Similar to LazyOpener, but that is also Closeable.

Calling close() on this object will not call the opener, and only close the stored value if it was already opened.

Method Summary

Modifier and Type	Method	Description
void	close()	Calls close on the result of the opener if it was already accessed through get() or getUnchecked().
T	get()	Get the object returned by the opener.
T	getUnchecked()	Get the object returned by the opener, throwing UncheckedIOException if the LazyOpener.Opener.open() method threw IOException.
static <U extends Closeable> LazyCloseable<U>	supply(LazyOpener.Opener<U> opener)	Create a new LazyCloseable for the given LazyOpener.Opener.

Methods inherited from class java.lang.Object

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

Method Details

supply

public static <U extends Closeable>
LazyCloseable<U> supply(LazyOpener.Opener<U> opener)

Create a new LazyCloseable for the given LazyOpener.Opener.

The opener will be called at most once; see Suppliers.memoize(Supplier).

Type Parameters:

U - the return type of the opener

Parameters:

opener - a function to "open" a resource

Returns:

a new lazily opened object

get

public T get()
      throws IOException

Get the object returned by the opener.

Returns:

the object returned by the opener

Throws:

IOException - if calling LazyOpener.Opener.open() threw an IOException

getUnchecked

public T getUnchecked()

Get the object returned by the opener, throwing UncheckedIOException if the LazyOpener.Opener.open() method threw IOException.

Returns:

the object returned by the opener

close

public void close()
           throws IOException

Calls close on the result of the opener if it was already accessed through get() or getUnchecked().

Specified by:

close in interface AutoCloseable

Specified by:

close in interface Closeable

Throws:

IOException - if the underlying close throws IOException.