1 files changed, 134 insertions, 0 deletions
diff --git a/sandbox/mobile-android/tuscany-assembly/src/main/java/org/apache/tuscany/sca/assembly/builder/impl/ImplementationPolicyComputer.java b/sandbox/mobile-android/tuscany-assembly/src/main/java/org/apache/tuscany/sca/assembly/builder/impl/ImplementationPolicyComputer.java
new file mode 100644
index 0000000000..2bd010c489
--- /dev/null
+++ b/sandbox/mobile-android/tuscany-assembly/src/main/java/org/apache/tuscany/sca/assembly/builder/impl/ImplementationPolicyComputer.java
@@ -0,0 +1,134 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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 org.apache.tuscany.sca.assembly.builder.impl;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.apache.tuscany.sca.assembly.Component;
+import org.apache.tuscany.sca.assembly.ConfiguredOperation;
+import org.apache.tuscany.sca.assembly.Implementation;
+import org.apache.tuscany.sca.assembly.OperationsConfigurator;
+import org.apache.tuscany.sca.policy.Intent;
+import org.apache.tuscany.sca.policy.IntentAttachPoint;
+import org.apache.tuscany.sca.policy.PolicySet;
+import org.apache.tuscany.sca.policy.PolicySetAttachPoint;
+import org.apache.tuscany.sca.policy.util.PolicyValidationException;
+
+/**
+ * Policy computation methods pertaining to computing Implementation Policies
+ */
+public class ImplementationPolicyComputer extends PolicyComputer {
+    
+    public ImplementationPolicyComputer() {
+        super();
+    }
+    
+    public void computeImplementationIntentsAndPolicySets(Implementation implementation, Component parent)  
+                                                                throws PolicyValidationException, PolicyComputationException {
+        if ( implementation instanceof PolicySetAttachPoint ) {
+            PolicySetAttachPoint policiedImplementation = (PolicySetAttachPoint)implementation;
+            //since for an implementation the component has its policy intents and policysets its possible
+            //that there are some intents there that does not constrain the implementation.. so prune 
+            List<Intent> prunedIntents = computeInheritableIntents(policiedImplementation.getType(), 
+                                                                   parent.getRequiredIntents());
+            parent.getRequiredIntents().clear();
+            parent.getRequiredIntents().addAll(prunedIntents);
+            normalizeIntents(parent);
+         
+            computeIntentsForOperations((OperationsConfigurator)parent,
+                                        (IntentAttachPoint)implementation,
+                                        parent.getRequiredIntents());
+            
+            
+            List<PolicySet> prunedPolicySets = computeInheritablePolicySets(parent.getPolicySets(),
+                                                                            parent.getApplicablePolicySets());
+            parent.getPolicySets().clear();
+            parent.getPolicySets().addAll(prunedPolicySets);
+            normalizePolicySets(parent);
+            computePolicySetsForOperations(parent.getApplicablePolicySets(), 
+                                           (OperationsConfigurator)parent, 
+                                           (PolicySetAttachPoint)implementation);
+            
+            determineApplicableImplementationPolicySets(parent);
+        }
+    }
+    
+    private void determineApplicableImplementationPolicySets(Component component) throws PolicyComputationException {
+        List<Intent> intentsCopy = null;
+        if ( component.getImplementation() instanceof PolicySetAttachPoint ) {
+            PolicySetAttachPoint policiedImplementation = (PolicySetAttachPoint)component.getImplementation();
+           
+            //trim intents specified in operations.  First check for policysets specified on the operation
+            //and then in the parent implementation
+            if ( component instanceof OperationsConfigurator ) {
+                OperationsConfigurator opConfigurator = (OperationsConfigurator)component;
+                
+                for ( ConfiguredOperation confOp : opConfigurator.getConfiguredOperations() ) {
+                    intentsCopy = new ArrayList<Intent>(confOp.getRequiredIntents());
+                    trimInherentlyProvidedIntents(policiedImplementation.getType(), 
+                                                  confOp.getRequiredIntents());
+                    trimProvidedIntents(confOp.getRequiredIntents(), confOp.getPolicySets());
+                    trimProvidedIntents(confOp.getRequiredIntents(), component.getPolicySets());
+                    
+                    determineApplicableDomainPolicySets(component.getApplicablePolicySets(), 
+                                                        confOp,
+                                                        policiedImplementation.getType());
+
+                    if (confOp.getRequiredIntents().size() > 0) {
+                        new PolicyComputationException("The following are unfulfilled intents for operations configured in "
+                                + "component implementation - " + component.getName() + "\nUnfulfilled Intents = " +
+                                confOp.getRequiredIntents());
+                    }
+                    
+                    //the intents list could have been trimmed when matching for policysets
+                    //since the implementation may need the original set of intents we copy that back
+                    confOp.getRequiredIntents().clear();
+                    confOp.getRequiredIntents().addAll(intentsCopy);
+                }
+            }
+                
+            intentsCopy = new ArrayList<Intent>(component.getRequiredIntents());
+            trimInherentlyProvidedIntents(policiedImplementation.getType(), 
+                                          component.getRequiredIntents());
+            trimProvidedIntents(component.getRequiredIntents(), component.getPolicySets());
+                
+            //determine additional policysets that match remaining intents
+            //if there are intents that are not provided by any policy set throw a warning
+            //TODO: resolved to domain policy registry and attach suitable policy sets to the implementation
+            //...for now using the SCA Definitions instead of registry
+            //if ( domainPolicySets != null)  {
+                determineApplicableDomainPolicySets(component.getApplicablePolicySets(), 
+                                                    component,
+                                                    policiedImplementation.getType());
+                                                    
+                if (component.getRequiredIntents().size() > 0) {
+                    throw new PolicyComputationException("The following are unfulfilled intents for component implementation - " + component
+                        .getName() + "\nUnfulfilled Intents = " + component.getRequiredIntents());
+                }
+            //}
+            
+            //the intents list could have been trimmed when matching for policysets
+            //since the bindings may need the original set of intents we copy that back
+            component.getRequiredIntents().clear();
+            component.getRequiredIntents().addAll(intentsCopy);
+        }
+    }
+}