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-rw-r--r--infra/translate-spi/src/main/java/io/fd/honeycomb/translate/spi/read/ReaderCustomizer.java63
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diff --git a/infra/translate-spi/src/main/java/io/fd/honeycomb/translate/spi/read/ReaderCustomizer.java b/infra/translate-spi/src/main/java/io/fd/honeycomb/translate/spi/read/ReaderCustomizer.java
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+++ b/infra/translate-spi/src/main/java/io/fd/honeycomb/translate/spi/read/ReaderCustomizer.java
@@ -0,0 +1,63 @@
+/*
+ * 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.translate.spi.read;
+
+import com.google.common.annotations.Beta;
+import io.fd.honeycomb.translate.read.ReadContext;
+import io.fd.honeycomb.translate.read.ReadFailedException;
+import javax.annotation.Nonnull;
+import org.opendaylight.yangtools.concepts.Builder;
+import org.opendaylight.yangtools.yang.binding.DataObject;
+import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
+
+/**
+ * CompositeChildReader SPI to customize its behavior.
+ *
+ * @param <C> Specific DataObject derived type (Identifiable), that is handled by this customizer
+ * @param <B> Specific Builder for handled type (C)
+ */
+@Beta
+public interface ReaderCustomizer<C extends DataObject, B extends Builder<C>> {
+
+ /**
+ * Creates new builder that will be used to build read value.
+ */
+ @Nonnull
+ B getBuilder(@Nonnull final InstanceIdentifier<C> id);
+
+ /**
+ * Adds current data (identified by id) to the provided builder.
+ *
+ * @param id id of current data object
+ * @param builder builder for creating read value
+ * @param ctx
+ * @throws ReadFailedException if read was unsuccessful
+ */
+ void readCurrentAttributes(@Nonnull final InstanceIdentifier<C> id,
+ @Nonnull final B builder,
+ @Nonnull final ReadContext ctx) throws ReadFailedException;
+
+ // FIXME need to capture parent builder type, but that's inconvenient at best, is it ok to leave it Builder<?> and
+ // cast in specific customizers ? ... probably better than adding another type parameter
+
+ /**
+ * Merge read data into provided parent builder.
+ */
+ void merge(@Nonnull final Builder<? extends DataObject> parentBuilder, @Nonnull final C readValue);
+
+
+}