1 files changed, 105 insertions, 0 deletions
diff --git a/src/main/java/org/onap/pomba/contextaggregator/config/BuilderConfigLoader.java b/src/main/java/org/onap/pomba/contextaggregator/config/BuilderConfigLoader.java
new file mode 100644
index 0000000..da9fe0f
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+++ b/src/main/java/org/onap/pomba/contextaggregator/config/BuilderConfigLoader.java
@@ -0,0 +1,105 @@
+/*
+ * ============LICENSE_START===================================================
+ * Copyright (c) 2018 Amdocs
+ * ============================================================================
+ * 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.
+ * ============LICENSE_END=====================================================
+ */
+package org.onap.pomba.contextaggregator.config;
+
+import static java.lang.String.format;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+import org.onap.pomba.contextaggregator.builder.ContextBuilder;
+import org.onap.pomba.contextaggregator.exception.ContextAggregatorError;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.core.io.Resource;
+import org.springframework.core.io.support.ResourcePatternResolver;
+
+@Configuration
+public class BuilderConfigLoader {
+    private static Logger log = LoggerFactory.getLogger(BuilderConfigLoader.class);
+    private static final Resource[] EMPTY_ARRAY = new Resource[0];
+    private static final String[] BUILDERS_PROPERTIES_LOCATION =
+            {"file:./%s/*.properties", "classpath:/%s/*.properties"};
+
+    @Autowired
+    private ResourcePatternResolver rpr;
+    @Value("${builders.properties.path}")
+    private String buildersPropertiesPath;
+
+
+    /**
+     * Generates a list of context builders by loading property files (*.properties) from a configured
+     * builders location.
+     *
+     * <pre>
+     * The location is searched in the following order: file:./${buildersPropertiesPath} and
+     * classpath:/${buildersPropertiesPath} to support override of default values.
+     *
+     * @return Returns a list of context builders
+     */
+    @Bean
+    public List<ContextBuilder> contextBuilders() {
+        try {
+            final Resource[] blrdsConfig = resolveBldrsConfig();
+            if (isEmpty(blrdsConfig)) {
+                log.error(ContextAggregatorError.BUILDER_PROPERTIES_NOT_FOUND
+                        .getMessage(Arrays.toString(bldrsPropLoc2Path(buildersPropertiesPath))));
+                return Collections.emptyList();
+            }
+
+            final List<ContextBuilder> contextBuilders = new ArrayList<>();
+            for (Resource r : blrdsConfig) {
+                contextBuilders.add(new ContextBuilder(r.getInputStream(), r.getFilename()));
+            }
+
+            return contextBuilders;
+        } catch (IOException ex) {
+            log.error(ContextAggregatorError.FAILED_TO_LOAD_BUILDER_PROPERTIES.getMessage(ex.getMessage()));
+        }
+
+        return Collections.emptyList();
+    }
+
+    private Resource[] resolveBldrsConfig() throws IOException {
+        for (String p : bldrsPropLoc2Path(buildersPropertiesPath)) {
+            Resource[] bldrsConfig = rpr.getResources(p);
+            if (!isEmpty(bldrsConfig)) {
+                return bldrsConfig;
+            }
+        }
+        return EMPTY_ARRAY;
+    }
+
+    private static String[] bldrsPropLoc2Path(String buildersPropertiesPath) {
+        String[] res = new String[BUILDERS_PROPERTIES_LOCATION.length];
+        int indx = 0;
+        for (String tmpl : BUILDERS_PROPERTIES_LOCATION) {
+            res[indx++] = format(tmpl, buildersPropertiesPath).replace("//", "/");
+        }
+        return res;
+    }
+
+    private static boolean isEmpty(Object[] obj) {
+        return obj == null || obj.length == 0;
+    }
+}