1 files changed, 123 insertions, 0 deletions
diff --git a/sca-java-1.x/tags/java-M1-final/java/sca/model/src/main/java/org/apache/tuscany/model/assembly/impl/AssemblyObjectImpl.java b/sca-java-1.x/tags/java-M1-final/java/sca/model/src/main/java/org/apache/tuscany/model/assembly/impl/AssemblyObjectImpl.java
new file mode 100644
index 0000000000..38056e1e1c
--- /dev/null
+++ b/sca-java-1.x/tags/java-M1-final/java/sca/model/src/main/java/org/apache/tuscany/model/assembly/impl/AssemblyObjectImpl.java
@@ -0,0 +1,123 @@
+/**
+ *
+ *  Copyright 2005 The Apache Software Foundation or its licensors, as applicable.
+ *
+ *  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 org.apache.tuscany.model.assembly.impl;
+
+import java.util.Collection;
+import java.util.Collections;
+import java.util.List;
+
+import org.apache.tuscany.model.assembly.AssemblyContext;
+import org.apache.tuscany.model.assembly.AssemblyObject;
+import org.apache.tuscany.model.assembly.AssemblyVisitor;
+
+/**
+ * A base class for assembly model objects.
+ */
+public abstract class AssemblyObjectImpl implements AssemblyObject {
+
+    private boolean frozen;
+    private boolean initialized;
+    
+    protected AssemblyObjectImpl() {
+    }
+
+    public boolean accept(AssemblyVisitor visitor) {
+        return visitor.visit(this);
+    }
+
+    /**
+     * Walk a visitor through a collection of model objects.
+     * @param collection
+     * @param visitor
+     */
+    protected boolean accept(Collection collection, AssemblyVisitor visitor) {
+        for (Object member : collection) {
+            if (member instanceof AssemblyObject) {
+                if (!((AssemblyObject)member).accept(visitor))
+                    return false;
+            }
+        }
+        return true;
+    }
+    
+    public void freeze() {
+        if (!frozen)
+            frozen=true;
+    }
+
+    /**
+     * Returns true if the object is frozen
+     */
+    protected boolean isFrozen() {
+        return frozen;
+    }
+    
+    /**
+     * Freeze a list and its members
+     */
+    protected <T> List<T> freeze(List<T> list) {
+        list=Collections.unmodifiableList(list);
+        for (Object member : list) {
+            if (member instanceof AssemblyObject) {
+                ((AssemblyObject)member).freeze();
+            }
+        }
+        return list;
+    }
+    
+    /**
+     * Check that the current model object can be modified.
+     * @throws IllegalStateException
+     */
+    protected void checkNotFrozen() {
+        if (frozen)
+            throw new IllegalStateException("Attempt to modify a frozen assembly model");
+    }
+    
+    public void initialize(AssemblyContext modelContext) {
+        if (!initialized)
+            initialized=true;
+    }
+    
+    /**
+     * Returns true if the object is initialized
+     */
+    protected boolean isInitialized() {
+        return initialized;
+    }
+    
+    /**
+     * Initialize members of a collection
+     */
+    protected void initialize(Collection collection, AssemblyContext modelContext) {
+        for (Object member : collection) {
+            if (member instanceof AssemblyObject) {
+                ((AssemblyObject)member).initialize(modelContext);
+            }
+        }
+    }
+    
+    /**
+     * Check that the current model object is initialized.
+     * @throws IllegalStateException
+     */
+    protected void checkInitialized() {
+        if (!initialized)
+            throw new IllegalStateException("Attempt to use an uninitialized assembly model");
+    }
+    
+}