binding/mdsal-binding-dom-codec/src/main/java/org/opendaylight/mdsal/binding/dom/codec/impl/DataObjectStreamerBridge.java

   1 /*
   2  * Copyright (c) 2019 PANTHEON.tech, s.r.o. and others.  All rights reserved.
   3  *
   4  * This program and the accompanying materials are made available under the
   5  * terms of the Eclipse Public License v1.0 which accompanies this distribution,
   6  * and is available at http://www.eclipse.org/legal/epl-v10.html
   7  */
   8 package org.opendaylight.mdsal.binding.dom.codec.impl;
   9
  10 import static com.google.common.base.Verify.verifyNotNull;
  11
  12 import com.google.common.annotations.Beta;
  13 import org.eclipse.jdt.annotation.NonNull;
  14 import org.eclipse.jdt.annotation.Nullable;
  15
  16 /**
  17  * Bridge for initializing {@link DataObjectStreamer} instance constants during class loading time. This class is public
  18  * only due to implementation restrictions and can change at any time.
  19  */
  20 // FIXME: this bridge is only necessary to work around Javassist compiler resolution of dependencies. If we switch to
  21 //         a more bytecode-oriented framework, this bridge becomes superfluous.
  22 //
  23 @Beta
  24 public final class DataObjectStreamerBridge {
  25     private static final ThreadLocal<DataObjectStreamerCustomizer> CURRENT_CUSTOMIZER = new ThreadLocal<>();
  26
  27     private DataObjectStreamerBridge() {
  28
  29     }
  30
  31     public static @NonNull DataObjectStreamer<?> resolve(final @NonNull String methodName) {
  32         return verifyNotNull(CURRENT_CUSTOMIZER.get(), "No customizer attached").resolve(methodName);
  33     }
  34
  35     static @Nullable DataObjectStreamerCustomizer setup(final @NonNull DataObjectStreamerCustomizer next) {
  36         final DataObjectStreamerCustomizer prev = CURRENT_CUSTOMIZER.get();
  37         CURRENT_CUSTOMIZER.set(verifyNotNull(next));
  38         return prev;
  39     }
  40
  41     static void tearDown(final @Nullable DataObjectStreamerCustomizer prev) {
  42         if (prev == null) {
  43             CURRENT_CUSTOMIZER.remove();
  44         } else {
  45             CURRENT_CUSTOMIZER.set(prev);
  46         }
  47     }
  48 }