1 files changed, 82 insertions, 0 deletions
diff --git a/infra/minimal-distribution/src/main/java/io/fd/honeycomb/infra/distro/schema/YangBindingProviderModule.java b/infra/minimal-distribution/src/main/java/io/fd/honeycomb/infra/distro/schema/YangBindingProviderModule.java
new file mode 100644
index 000000000..4348333a9
--- /dev/null
+++ b/infra/minimal-distribution/src/main/java/io/fd/honeycomb/infra/distro/schema/YangBindingProviderModule.java
@@ -0,0 +1,82 @@
+/*
+ * 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.infra.distro.schema;
+
+import com.google.common.base.Charsets;
+import com.google.common.base.Strings;
+import com.google.common.collect.Lists;
+import com.google.common.io.Resources;
+import com.google.inject.AbstractModule;
+import com.google.inject.Singleton;
+import com.google.inject.multibindings.Multibinder;
+import java.io.IOException;
+import java.net.URL;
+import java.util.Collections;
+import java.util.List;
+import javax.annotation.Nonnull;
+import org.opendaylight.yangtools.yang.binding.YangModelBindingProvider;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Load all YangModelBindingProvider classes from classpath.
+ * <p/>
+ * Relying on /META-INF/services/ metadata.
+ */
+public class YangBindingProviderModule extends AbstractModule {
+    private static final Logger LOG = LoggerFactory.getLogger(YangBindingProviderModule.class);
+
+    private static final String YANG_BA_PROVIDER_PATH = "META-INF/services/" + YangModelBindingProvider.class.getName();
+
+    protected void configure() {
+        final Multibinder<YangModelBindingProvider> binder =
+                Multibinder.newSetBinder(binder(), YangModelBindingProvider.class);
+        final List<URL> resources;
+        try {
+            resources = Collections.list(getClass().getClassLoader().getResources(YANG_BA_PROVIDER_PATH));
+        } catch (IOException e) {
+            throw new IllegalStateException("Unable to load binding providers from path: " + YANG_BA_PROVIDER_PATH, e);
+        }
+        LOG.debug("ModuleProviders found at {}", resources);
+        resources.stream()
+                .map(YangBindingProviderModule::urlToString)
+                .flatMap(content -> Lists.newArrayList(content.split("\n")).stream())
+                .filter(line -> !Strings.isNullOrEmpty(line.trim()))
+                .map(YangBindingProviderModule::loadClass)
+                .forEach(providerClass -> {
+                    LOG.debug("ModuleProvider found for {}", providerClass);
+                    binder.addBinding().to((Class<? extends YangModelBindingProvider>) providerClass)
+                            .in(Singleton.class);
+                });
+    }
+
+    private static Class<?> loadClass(@Nonnull final String className) {
+        try {
+            return Class.forName(className);
+        } catch (ClassNotFoundException e) {
+            throw new IllegalArgumentException("Unable to load class: " + className, e);
+        }
+    }
+
+    private static String urlToString(@Nonnull final URL url) {
+        try {
+            return Resources.toString(url, Charsets.UTF_8);
+        } catch (IOException e) {
+            throw new IllegalArgumentException("Unable to read resource from: " + url, e);
+        }
+    }
+}