1 files changed, 128 insertions, 0 deletions
diff --git a/velocity-engine-core/src/main/java/org/apache/velocity/runtime/parser/node/PublicFieldExecutor.java b/velocity-engine-core/src/main/java/org/apache/velocity/runtime/parser/node/PublicFieldExecutor.java
new file mode 100644
index 00000000..643f9817
--- /dev/null
+++ b/velocity-engine-core/src/main/java/org/apache/velocity/runtime/parser/node/PublicFieldExecutor.java
@@ -0,0 +1,128 @@
+package org.apache.velocity.runtime.parser.node;
+
+/*
+ * 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 org.apache.commons.lang3.StringUtils;
+import org.apache.velocity.exception.VelocityException;
+import org.apache.velocity.util.introspection.Introspector;
+import org.slf4j.Logger;
+
+import java.lang.reflect.Field;
+import java.lang.reflect.InvocationTargetException;
+
+/**
+ * Returns the value of a public field when executed.
+ */
+public class PublicFieldExecutor extends AbstractExecutor
+{
+    private final Introspector introspector;
+
+    /**
+     * Field to be accessed
+     */
+    private Field field = null;
+
+    /**
+     * @param log
+     * @param introspector
+     * @param clazz
+     * @param property
+     * @since 1.5
+     */
+    public PublicFieldExecutor(final Logger log, final Introspector introspector,
+            final Class<?> clazz, final String property)
+    {
+        this.log = log;
+        this.introspector = introspector;
+
+        // Don't allow passing in the empty string or null because
+        // it will either fail with a StringIndexOutOfBounds error
+        // or the introspector will get confused.
+        if (StringUtils.isNotEmpty(property))
+        {
+            discover(clazz, property);
+        }
+    }
+
+    @Override
+    public boolean isAlive() {
+        return getField() != null;
+    }
+
+    /**
+     * @return The current field.
+     */
+    public Field getField()
+    {
+        return field;
+    }
+
+    /**
+     * @param field
+     */
+    protected void setField(final Field field)
+    {
+        this.field = field;
+    }
+
+    /**
+     * @return The current introspector.
+     * @since 1.5
+     */
+    protected Introspector getIntrospector()
+    {
+        return this.introspector;
+    }
+
+    /**
+     * @param clazz
+     * @param property
+     */
+    protected void discover(final Class<?> clazz, final String property)
+    {
+        try
+        {
+            setField(introspector.getField(clazz, property));
+        }
+        /*
+         * pass through application level runtime exceptions
+         */
+        catch( RuntimeException e )
+        {
+            throw e;
+        }
+        catch(Exception e)
+        {
+            String msg = "Exception while looking for public field '" + property;
+            log.error(msg, e);
+            throw new VelocityException(msg, e);
+        }
+    }
+
+    /**
+     * @see org.apache.velocity.runtime.parser.node.AbstractExecutor#execute(java.lang.Object)
+     */
+    @Override
+    public Object execute(Object o)
+        throws IllegalAccessException,  InvocationTargetException
+    {
+        return isAlive() ? getField().get(o) : null;
+    }
+}