1 files changed, 124 insertions, 0 deletions
diff --git a/velocity-engine-core/src/main/java/org/apache/velocity/util/introspection/LinkingUberspector.java b/velocity-engine-core/src/main/java/org/apache/velocity/util/introspection/LinkingUberspector.java
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--- /dev/null
+++ b/velocity-engine-core/src/main/java/org/apache/velocity/util/introspection/LinkingUberspector.java
@@ -0,0 +1,124 @@
+package org.apache.velocity.util.introspection;
+
+/*
+ * 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.
+ */
+
+import java.util.Iterator;
+
+/**
+ * <p>
+ * When the introspector.uberspect.class configuration property contains several
+ * uberspector class names, it means those uberspectors will be chained. When an
+ * uberspector in the list other than the leftmost does not implement ChainableUberspector,
+ * then this utility class is used to provide a basic default chaining where the
+ * first non-null result is kept for each introspection call.
+ * </p>
+ *
+ * @since 1.6
+ * @see ChainableUberspector
+ * @version $Id: LinkingUberspector.java 10959 2008-07-01 00:12:29Z sdumitriu $
+ */
+public class LinkingUberspector extends AbstractChainableUberspector
+{
+    private Uberspect leftUberspect;
+    private Uberspect rightUberspect;
+
+    /**
+     * Constructor that takes the two uberspectors to link
+     * @param left left uberspector
+     * @param right right uberspector
+     */
+    public LinkingUberspector(Uberspect left,Uberspect right) {
+        leftUberspect = left;
+        rightUberspect = right;
+    }
+
+    /**
+     * {@inheritDoc}
+     * <p>
+     * Init both wrapped uberspectors
+     * </p>
+     *
+     * @see org.apache.velocity.util.introspection.Uberspect#init()
+     */
+    //@Override
+    @Override
+    public void init()
+    {
+        leftUberspect.init();
+        rightUberspect.init();
+    }
+
+    /**
+     * {@inheritDoc}
+     *
+     * @see org.apache.velocity.util.introspection.Uberspect#getIterator(java.lang.Object,
+     *      org.apache.velocity.util.introspection.Info)
+     */
+    //@SuppressWarnings("unchecked")
+    //@Override
+    @Override
+    public Iterator getIterator(Object obj, Info i)
+    {
+        Iterator it = leftUberspect.getIterator(obj,i);
+        return it != null ? it : rightUberspect.getIterator(obj,i);
+    }
+
+    /**
+     * {@inheritDoc}
+     *
+     * @see org.apache.velocity.util.introspection.Uberspect#getMethod(java.lang.Object, java.lang.String,
+     *      java.lang.Object[], org.apache.velocity.util.introspection.Info)
+     */
+    //@Override
+    @Override
+    public VelMethod getMethod(Object obj, String methodName, Object[] args, Info i)
+    {
+        VelMethod method = leftUberspect.getMethod(obj,methodName,args,i);
+        return method != null ? method : rightUberspect.getMethod(obj,methodName,args,i);
+    }
+
+    /**
+     * {@inheritDoc}
+     *
+     * @see org.apache.velocity.util.introspection.Uberspect#getPropertyGet(java.lang.Object, java.lang.String,
+     *      org.apache.velocity.util.introspection.Info)
+     */
+    //@Override
+    @Override
+    public VelPropertyGet getPropertyGet(Object obj, String identifier, Info i)
+    {
+        VelPropertyGet getter = leftUberspect.getPropertyGet(obj,identifier,i);
+        return getter != null ? getter : rightUberspect.getPropertyGet(obj,identifier,i);
+    }
+
+    /**
+     * {@inheritDoc}
+     *
+     * @see org.apache.velocity.util.introspection.Uberspect#getPropertySet(java.lang.Object, java.lang.String,
+     *      java.lang.Object, org.apache.velocity.util.introspection.Info)
+     */
+    //@Override
+    @Override
+    public VelPropertySet getPropertySet(Object obj, String identifier, Object arg, Info i)
+    {
+        VelPropertySet setter = leftUberspect.getPropertySet(obj,identifier,arg,i);
+        return setter != null ? setter : rightUberspect.getPropertySet(obj,identifier,arg,i);
+    }
+}