1 files changed, 120 insertions, 0 deletions
diff --git a/velocity-engine-core/src/main/java/org/apache/velocity/util/introspection/AbstractChainableUberspector.java b/velocity-engine-core/src/main/java/org/apache/velocity/util/introspection/AbstractChainableUberspector.java
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--- /dev/null
+++ b/velocity-engine-core/src/main/java/org/apache/velocity/util/introspection/AbstractChainableUberspector.java
@@ -0,0 +1,120 @@
+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;
+
+/**
+ * Default implementation of a {@link ChainableUberspector chainable uberspector} that forwards all calls to the wrapped
+ * uberspector (when that is possible). It should be used as the base class for all chainable uberspectors.
+ *
+ * @version $Id: $
+ * @since 1.6
+ * @see ChainableUberspector
+ */
+public abstract class AbstractChainableUberspector extends UberspectImpl implements ChainableUberspector
+{
+    /** The wrapped (decorated) uberspector. */
+    protected Uberspect inner;
+
+    /**
+     * {@inheritDoc}
+     *
+     * @see ChainableUberspector#wrap(org.apache.velocity.util.introspection.Uberspect)
+     * @see #inner
+     */
+    @Override
+    public void wrap(Uberspect inner)
+    {
+        this.inner = inner;
+    }
+
+    /**
+     * init - the chainable uberspector is responsible for the initialization of the wrapped uberspector
+     *
+     * @see org.apache.velocity.util.introspection.Uberspect#init()
+     */
+    //@Override
+    @Override
+    public void init()
+    {
+        if (this.inner != null) {
+            try {
+                this.inner.init();
+            } catch (Exception e) {
+                log.error(e.getMessage(), e);
+                this.inner = null;
+            }
+        }
+    }
+
+    /**
+     * {@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)
+    {
+        return (this.inner != null) ? this.inner.getIterator(obj, i) : null;
+    }
+
+    /**
+     * {@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)
+    {
+        return (this.inner != null) ? this.inner.getMethod(obj, methodName, args, i) : null;
+    }
+
+    /**
+     * {@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)
+    {
+        return (this.inner != null) ? this.inner.getPropertyGet(obj, identifier, i) : null;
+    }
+
+    /**
+     * {@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)
+    {
+        return (this.inner != null) ? this.inner.getPropertySet(obj, identifier, arg, i) : null;
+    }
+}