diff options
author | alexanders@b2ef00c0-3703-41da-baef-cfe82387ac0c <none@none> | 2010-02-03 00:48:31 +0000 |
---|---|---|
committer | alexanders@b2ef00c0-3703-41da-baef-cfe82387ac0c <none@none> | 2010-02-03 00:48:31 +0000 |
commit | 1a5e3c2d64be1c05a422fd78b23a31de155eca64 (patch) | |
tree | 71b2236dd23d409b0ce8a9576758123922b57898 /trunk/infrastructure/net.appjet.oui/dynamicvar.scala | |
parent | 4a9748e10084ca99fadec4f0fb1a3c22af7f3794 (diff) | |
download | etherpad-1a5e3c2d64be1c05a422fd78b23a31de155eca64.tar.gz etherpad-1a5e3c2d64be1c05a422fd78b23a31de155eca64.tar.xz etherpad-1a5e3c2d64be1c05a422fd78b23a31de155eca64.zip |
removed duplicate trunk directory
--HG--
extra : convert_revision : svn%3Ab2ef00c0-3703-41da-baef-cfe82387ac0c/trunk%404
Diffstat (limited to 'trunk/infrastructure/net.appjet.oui/dynamicvar.scala')
-rw-r--r-- | trunk/infrastructure/net.appjet.oui/dynamicvar.scala | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/trunk/infrastructure/net.appjet.oui/dynamicvar.scala b/trunk/infrastructure/net.appjet.oui/dynamicvar.scala new file mode 100644 index 0000000..b1f8c2e --- /dev/null +++ b/trunk/infrastructure/net.appjet.oui/dynamicvar.scala @@ -0,0 +1,49 @@ +/** + * Copyright 2009 Google Inc. + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS-IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +package net.appjet.oui; + +class NoninheritedDynamicVariable[T](init: T) { + private val tl = new ThreadLocal[T] { + override def initialValue = init.asInstanceOf[T with AnyRef] + } + + /** Retrieve the current value */ + def value: T = tl.get.asInstanceOf[T] + + + /** Set the value of the variable while executing the specified + * thunk. + * + * @param newval The value to which to set the fluid + * @param thunk The code to evaluate under the new setting + */ + def withValue[S](newval: T)(thunk: =>S): S = { + val oldval = value + tl.set(newval) + + try { thunk } finally { + tl.set(oldval) + } + } + + /** Change the currently bound value, discarding the old value. + * Usually <code>withValue()</code> gives better semantics. + */ + def value_=(newval: T) = { tl.set(newval) } + + override def toString: String = "NoninheritedDynamicVariable(" + value +")" +} |