1 files changed, 133 insertions, 0 deletions
diff --git a/ONAP-ControlloopPolicy/src/main/java/org/onap/policy/controlloop/guard/compiler/ControlLoopGuardCompiler.java b/ONAP-ControlloopPolicy/src/main/java/org/onap/policy/controlloop/guard/compiler/ControlLoopGuardCompiler.java
new file mode 100644
index 000000000..de5b47641
--- /dev/null
+++ b/ONAP-ControlloopPolicy/src/main/java/org/onap/policy/controlloop/guard/compiler/ControlLoopGuardCompiler.java
@@ -0,0 +1,133 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * ONAP Policy Engine
+ * ================================================================================
+ * Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
+ * ================================================================================
+ * 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.policy.controlloop.guard.compiler;
+
+
+import java.io.InputStream;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+
+import org.onap.policy.controlloop.compiler.CompilerException;
+import org.onap.policy.controlloop.compiler.ControlLoopCompilerCallback;
+import org.onap.policy.controlloop.policy.guard.Constraint;
+import org.onap.policy.controlloop.policy.guard.ControlLoopGuard;
+import org.onap.policy.controlloop.policy.guard.GuardPolicy;
+import org.yaml.snakeyaml.Yaml;
+import org.yaml.snakeyaml.constructor.Constructor;
+
+public class ControlLoopGuardCompiler {
+	
+	private ControlLoopGuardCompiler(){
+		// Private Constructor 
+	}
+	
+	public static ControlLoopGuard compile(ControlLoopGuard cLGuard, ControlLoopCompilerCallback callback) throws CompilerException {
+		//
+		// Ensure ControlLoopGuard has at least one guard policies
+		//
+		validateControlLoopGuard(cLGuard, callback);
+		//
+		// Ensure each guard policy has at least one constraints and all guard policies are unique
+		//
+		validateGuardPolicies(cLGuard.getGuards(), callback);
+		//
+		// Ensure constraints for each guard policy are unique
+		//
+		validateConstraints(cLGuard.getGuards(), callback);
+		
+		return cLGuard;
+	}
+	
+	public static ControlLoopGuard	compile(InputStream yamlSpecification, ControlLoopCompilerCallback callback) throws CompilerException {
+		Yaml yaml = new Yaml(new Constructor(ControlLoopGuard.class));
+		Object obj = yaml.load(yamlSpecification);
+		if (obj == null) {
+			throw new CompilerException("Could not parse yaml specification.");
+		}
+		if (! (obj instanceof ControlLoopGuard)) {
+			throw new CompilerException("Yaml could not parse specification into required ControlLoopGuard object");
+		}
+		return ControlLoopGuardCompiler.compile((ControlLoopGuard) obj, callback);
+	}
+	
+	private static void validateControlLoopGuard(ControlLoopGuard cLGuard, ControlLoopCompilerCallback callback) throws CompilerException {
+		if (cLGuard == null) {
+			if (callback != null) {
+				callback.onError("ControlLoop Guard cannot be null");
+			}
+			throw new CompilerException("ControlLoop Guard cannot be null");
+		}
+		if (cLGuard.getGuard() == null && callback != null) {
+			callback.onError("Guard version cannot be null");
+		}
+		if (cLGuard.getGuards() == null) {
+			if (callback != null) {
+				callback.onError("ControlLoop Guard should have at least one guard policies");
+			}
+		} else if (cLGuard.getGuards().isEmpty() && callback != null) {
+			callback.onError("ControlLoop Guard should have at least one guard policies");
+		}
+	}
+	
+	private static void validateGuardPolicies(List<GuardPolicy> policies, ControlLoopCompilerCallback callback) throws CompilerException {
+		if (policies == null) {
+			if (callback != null) {
+				callback.onError("Guard policies should not be null");
+			}
+			throw new CompilerException("Guard policies should not be null");
+		}
+		//
+		// Ensure all guard policies are unique
+		//
+		Set<GuardPolicy> newSet = new HashSet<>(policies);
+		if (newSet.size() != policies.size() && callback != null) {
+			callback.onWarning("There are duplicate guard policies");
+		}
+		//
+		// Ensure each guard policy has at least one constraints
+		//
+		for (GuardPolicy policy : policies) {
+			if (policy.getLimit_constraints() == null || policy.getLimit_constraints().isEmpty()) {
+				if (callback != null) {
+					callback.onError("Guard policy " + policy.getName() + " does not have any limit constraint");
+				}
+				throw new CompilerException("Guard policy " + policy.getName() + " does not have any limit constraint");
+			}
+		}
+	}
+	
+	private static void validateConstraints(List<GuardPolicy> policies, ControlLoopCompilerCallback callback) throws CompilerException {
+		if (policies == null) {
+			if (callback != null) {
+				callback.onError("Guard policies should not be null");
+			}
+			throw new CompilerException("Guard policies should not be null");
+		}
+		for (GuardPolicy policy : policies) {
+			Set<Constraint> newSet = new HashSet<>(policy.getLimit_constraints());
+			if (newSet.size() != policy.getLimit_constraints().size() && callback != null) {
+				callback.onWarning("Guard policy " + policy.getName() + " has duplicate limit constraints");
+			}
+		}
+	}
+	
+}