Add RFC8294 models

[mdsal.git] / model / ietf / rfc8294-ietf-routing-types / src / main / java / org / opendaylight / yang / gen / v1 / urn / ietf / params / xml / ns / yang / ietf / routing / types / rev171204 / MplsLabelBuilder.java

diff --git a/model/ietf/rfc8294-ietf-routing-types/src/main/java/org/opendaylight/yang/gen/v1/urn/ietf/params/xml/ns/yang/ietf/routing/types/rev171204/MplsLabelBuilder.java b/model/ietf/rfc8294-ietf-routing-types/src/main/java/org/opendaylight/yang/gen/v1/urn/ietf/params/xml/ns/yang/ietf/routing/types/rev171204/MplsLabelBuilder.java
new file mode 100644 (file)
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+++ b/model/ietf/rfc8294-ietf-routing-types/src/main/java/org/opendaylight/yang/gen/v1/urn/ietf/params/xml/ns/yang/ietf/routing/types/rev171204/MplsLabelBuilder.java
@@ -0,0 +1,86 @@
+/*
+ * Copyright (c) 2018 Pantheon Technologies, s.r.o. and others.  All rights reserved.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v1.0 which accompanies this distribution,
+ * and is available at http://www.eclipse.org/legal/epl-v10.html
+ */
+package org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.routing.types.rev171204;
+
+import com.google.common.annotations.Beta;
+import com.google.common.cache.CacheBuilder;
+import com.google.common.cache.CacheLoader;
+import com.google.common.cache.LoadingCache;
+import java.util.AbstractMap.SimpleImmutableEntry;
+import java.util.Map.Entry;
+import java.util.Optional;
+import org.eclipse.jdt.annotation.NonNullByDefault;
+import org.opendaylight.yangtools.util.ClassLoaderUtils;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Builder for {@link MplsLabel} instances.
+ *
+ * @author Robert Varga
+ */
+@Beta
+@NonNullByDefault
+public final class MplsLabelBuilder {
+    private static final Logger LOG = LoggerFactory.getLogger(MplsLabelBuilder.class);
+
+    @SuppressWarnings("null")
+    private static final LoadingCache<Entry<ClassLoader, String>, Optional<MplsLabel>> CLASS_CACHE =
+    CacheBuilder.newBuilder()
+            .weakKeys().build(new CacheLoader<Entry<ClassLoader, String>, Optional<MplsLabel>>() {
+                @Override
+                public Optional<MplsLabel> load(final Entry<ClassLoader, String> key) {
+                    return loadClass(key.getKey(), key.getValue());
+                }
+            });
+
+    private MplsLabelBuilder() {
+
+    }
+
+    public static MplsLabel getDefaultInstance(final String defaultValue) {
+        if (defaultValue.startsWith("interface ")) {
+            final Optional<MplsLabel> optStatic = CLASS_CACHE.getUnchecked(
+                new SimpleImmutableEntry<>(MplsLabelBuilder.class.getClassLoader(), defaultValue));
+            if (optStatic.isPresent()) {
+                return optStatic.get();
+            }
+
+            final ClassLoader tccl = Thread.currentThread().getContextClassLoader();
+            if (tccl != null) {
+                final Optional<MplsLabel> optThreadLocal = CLASS_CACHE.getUnchecked(
+                    new SimpleImmutableEntry<>(tccl, defaultValue));
+                if (optThreadLocal.isPresent()) {
+                    return optThreadLocal.get();
+                }
+            }
+        }
+
+        return new MplsLabel(new MplsLabelGeneralUse(Long.valueOf(defaultValue)));
+    }
+
+    static Optional<MplsLabel> loadClass(final ClassLoader loader, final String key) {
+        final Class<?> cls;
+        try {
+            cls = ClassLoaderUtils.loadClass(loader, key);
+        } catch (ClassNotFoundException e) {
+            LOG.debug("%s not found in classloader of %s", key, loader);
+            return Optional.empty();
+        }
+
+        final Class<? extends MplsLabelSpecialPurposeValue> cast;
+        try {
+            cast = cls.asSubclass(MplsLabelSpecialPurposeValue.class);
+        } catch (ClassCastException e) {
+            LOG.warn("%s does not implement %s", MplsLabelSpecialPurposeValue.class);
+            return Optional.empty();
+        }
+
+        return Optional.of(new MplsLabel(cast));
+    }
+}