1 files changed, 139 insertions, 0 deletions
diff --git a/sca-java-2.x/tags/2.0.1-RC1/modules/builder/src/main/java/org/apache/tuscany/sca/builder/impl/IntentValidator.java b/sca-java-2.x/tags/2.0.1-RC1/modules/builder/src/main/java/org/apache/tuscany/sca/builder/impl/IntentValidator.java
new file mode 100644
index 0000000000..b2f7a4ceed
--- /dev/null
+++ b/sca-java-2.x/tags/2.0.1-RC1/modules/builder/src/main/java/org/apache/tuscany/sca/builder/impl/IntentValidator.java
@@ -0,0 +1,139 @@
+/*
+ * 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.builder.impl;
+
+import java.util.List;
+
+import javax.xml.namespace.QName;
+
+import org.apache.tuscany.sca.assembly.Component;
+import org.apache.tuscany.sca.assembly.Endpoint;
+import org.apache.tuscany.sca.assembly.EndpointReference;
+import org.apache.tuscany.sca.assembly.Implementation;
+import org.apache.tuscany.sca.assembly.builder.BuilderContext;
+import org.apache.tuscany.sca.assembly.builder.Messages;
+import org.apache.tuscany.sca.assembly.builder.PolicyBuilder;
+import org.apache.tuscany.sca.core.ExtensionPointRegistry;
+import org.apache.tuscany.sca.monitor.Monitor;
+import org.apache.tuscany.sca.policy.Intent;
+import org.apache.tuscany.sca.policy.PolicySubject;
+
+/**
+ * Intent Validator
+ */
+public class IntentValidator implements PolicyBuilder {
+
+    /**
+     * Defaut constructor
+     * @param registry Extension Registry
+     */
+    public IntentValidator(ExtensionPointRegistry registry) {
+        super();
+    }
+
+    public boolean build(Endpoint endpoint, BuilderContext context) {
+        return checkMutualExclusion(endpoint, context);
+    }
+
+    public boolean build(EndpointReference endpointReference, BuilderContext context) {
+        boolean ok = checkMutualExclusion(endpointReference, context);
+        if(!ok) {
+            return false;
+        }
+
+        Endpoint endpoint = endpointReference.getTargetEndpoint();
+        if (endpoint == null) {
+            return true;
+        }
+        ok = checkMutualExclusion(endpointReference, endpoint, context);
+        List<Intent> intentList1 = endpointReference.getRequiredIntents();
+        List<Intent> intentList2 = endpoint.getRequiredIntents();
+        return ok;
+    }
+
+    public boolean build(Component component, Implementation implementation, BuilderContext context) {
+        return true;
+    }
+    
+    public boolean build(EndpointReference endpointReference, Endpoint endpoint, BuilderContext context) {
+        return true;
+    }    
+
+    public QName getPolicyType() {
+        return null;
+    }
+    
+    public List<QName> getSupportedBindings() {
+        return null;
+    }    
+
+    /**
+     * Check if two policy subjects requires multually exclusive intents
+     * @param subject1
+     * @param subject2
+     * @param monitor 
+     * @return
+     */
+    private boolean checkMutualExclusion(PolicySubject subject1, PolicySubject subject2, BuilderContext context) {
+        if (subject1 == subject2 || subject1 == null || subject2 == null) {
+            return false;
+        }
+        for (Intent i1 : subject1.getRequiredIntents()) {
+            for (Intent i2 : subject2.getRequiredIntents()) {
+                if (i1.getExcludedIntents().contains(i2) || i2.getExcludedIntents().contains(i1)) {
+                    Monitor.error(context.getMonitor(),
+                                  this,
+                                  Messages.ASSEMBLY_VALIDATION,
+                                  "MutuallyExclusiveIntents",
+                                  new Object[] {subject1, subject2},
+                                  i1,
+                                  i2);
+                    return true;
+                }
+            }
+        }
+        return false;
+    }
+
+    private boolean checkMutualExclusion(PolicySubject subject, BuilderContext context) {
+        if (subject == null) {
+            return false;
+        }
+        List<Intent> intents = subject.getRequiredIntents();
+        int size = intents.size();
+        for (int i = 0; i < size; i++) {
+            for (int j = i + 1; j < size; j++) {
+                Intent i1 = intents.get(i);
+                Intent i2 = intents.get(j);
+                if (i1 != i2 && i1.getExcludedIntents().contains(i2) || i2.getExcludedIntents().contains(i1)) {
+                    Monitor.error(context.getMonitor(),
+                                  this,
+                                  Messages.ASSEMBLY_VALIDATION,
+                                  "MutuallyExclusiveIntents",
+                                  subject,
+                                  i1,
+                                  i2);
+                    return true;
+                }
+            }
+        }
+        return false;
+    }
+}