1 files changed, 59 insertions, 0 deletions
diff --git a/v3po/vpp-facade-utils/src/main/java/io/fd/honeycomb/v3po/vpp/facade/impl/write/util/ReflexiveChildWriterCustomizer.java b/v3po/vpp-facade-utils/src/main/java/io/fd/honeycomb/v3po/vpp/facade/impl/write/util/ReflexiveChildWriterCustomizer.java
new file mode 100644
index 000000000..820f469d6
--- /dev/null
+++ b/v3po/vpp-facade-utils/src/main/java/io/fd/honeycomb/v3po/vpp/facade/impl/write/util/ReflexiveChildWriterCustomizer.java
@@ -0,0 +1,59 @@
+/*
+ * Copyright (c) 2016 Cisco and/or its affiliates.
+ *
+ * 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 io.fd.honeycomb.v3po.vpp.facade.impl.write.util;
+
+import com.google.common.base.Optional;
+import com.google.common.base.Preconditions;
+import com.google.common.collect.Iterables;
+import io.fd.honeycomb.v3po.vpp.facade.impl.util.ReflectionUtils;
+import io.fd.honeycomb.v3po.vpp.facade.spi.write.ChildVppWriterCustomizer;
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+import java.util.Collections;
+import javax.annotation.Nonnull;
+import org.opendaylight.yangtools.yang.binding.DataObject;
+import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
+
+/**
+ * Might be slow !
+ */
+public class ReflexiveChildWriterCustomizer<C extends DataObject> extends NoopWriterCustomizer<C> implements
+    ChildVppWriterCustomizer<C> {
+
+    @Nonnull
+    @Override
+    @SuppressWarnings("unchecked")
+    public Optional<C> extract(@Nonnull final InstanceIdentifier<C> currentId, @Nonnull final DataObject parentData) {
+        final Class<C> currentType = currentId.getTargetType();
+        final Optional<Method> method = ReflectionUtils.findMethodReflex(getParentType(currentId),
+            "get" + currentType.getSimpleName(), Collections.<Class<?>>emptyList(), currentType);
+
+        Preconditions.checkArgument(method.isPresent(), "Unable to get %s from %s", currentType, parentData);
+
+        try {
+            return method.isPresent()
+                ? Optional.of((C) method.get().invoke(parentData))
+                : Optional.<C>absent();
+        } catch (IllegalAccessException | InvocationTargetException e) {
+            throw new IllegalArgumentException("Unable to get " + currentType + " from " + parentData, e);
+        }
+    }
+
+    private Class<? extends DataObject> getParentType(final @Nonnull InstanceIdentifier<C> currentId) {
+        return Iterables.get(currentId.getPathArguments(), Iterables.size(currentId.getPathArguments()) - 2).getType();
+    }
+}