1 files changed, 132 insertions, 0 deletions
diff --git a/sca-java-1.x/tags/java-stable-20060304/sca/model/src/main/java/org/apache/tuscany/model/assembly/impl/AssemblyModelObjectImpl.java b/sca-java-1.x/tags/java-stable-20060304/sca/model/src/main/java/org/apache/tuscany/model/assembly/impl/AssemblyModelObjectImpl.java
new file mode 100644
index 0000000000..356fc4f0a9
--- /dev/null
+++ b/sca-java-1.x/tags/java-stable-20060304/sca/model/src/main/java/org/apache/tuscany/model/assembly/impl/AssemblyModelObjectImpl.java
@@ -0,0 +1,132 @@
+/**
+ *
+ *  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 org.apache.tuscany.model.assembly.AssemblyModelContext;
+import org.apache.tuscany.model.assembly.AssemblyModelObject;
+import org.apache.tuscany.model.assembly.AssemblyModelVisitor;
+
+/**
+ * A base class for assembly model objects.
+ */
+public abstract class AssemblyModelObjectImpl implements AssemblyModelObject {
+
+    private boolean frozen;
+    private boolean initialized;
+    
+    /**
+     * Constructor
+     */
+    protected AssemblyModelObjectImpl() {
+    }
+
+    /**
+     * @see org.apache.tuscany.model.assembly.AssemblyModelObject#accept(org.apache.tuscany.model.assembly.AssemblyModelVisitor)
+     */
+    public boolean accept(AssemblyModelVisitor visitor) {
+        return visitor.visit(this);
+    }
+
+    /**
+     * Walk a visitor through a collection of model objects.
+     * @param collection
+     * @param visitor
+     * @return
+     */
+    protected boolean accept(Collection collection, AssemblyModelVisitor visitor) {
+        for (Object member : collection) {
+            if (member instanceof AssemblyModelObject) {
+                if (!((AssemblyModelObject)member).accept(visitor))
+                    return false;
+            }
+        }
+        return true;
+    }
+    
+    /**
+     * @see org.apache.tuscany.model.assembly.AssemblyModelObject#freeze()
+     */
+    public void freeze() {
+        if (!frozen)
+            frozen=true;
+    }
+
+    /**
+     * Returns true if the object is frozen
+     */
+    protected boolean isFrozen() {
+        return frozen;
+    }
+    
+    /**
+     * Freeze members of a collection
+     */
+    protected void freeze(Collection collection) {
+        for (Object member : collection) {
+            if (member instanceof AssemblyModelObject) {
+                ((AssemblyModelObject)member).freeze();
+            }
+        }
+    }
+    
+    /**
+     * 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");
+    }
+    
+    /**
+     * @see org.apache.tuscany.model.assembly.AssemblyModelObject#initialize(org.apache.tuscany.model.assembly.AssemblyModelContext)
+     */
+    public void initialize(AssemblyModelContext 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, AssemblyModelContext modelContext) {
+        for (Object member : collection) {
+            if (member instanceof AssemblyModelObject) {
+                ((AssemblyModelObject)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");
+    }
+    
+}