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;
import org.apache.velocity.runtime.RuntimeServices;
import org.apache.velocity.util.RuntimeServicesAware;
/**
* <p>
* When the runtime.introspection.uberspect 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
*/
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
public void init() throws Exception
{
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
public Iterator getIterator(Object obj, Info i) throws Exception
{
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
public VelMethod getMethod(Object obj, String methodName, Object[] args, Info i) throws Exception
{
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
public VelPropertyGet getPropertyGet(Object obj, String identifier, Info i) throws Exception
{
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
public VelPropertySet getPropertySet(Object obj, String identifier, Object arg, Info i) throws Exception
{
VelPropertySet setter = leftUberspect.getPropertySet(obj,identifier,arg,i);
return setter != null ? setter : rightUberspect.getPropertySet(obj,identifier,arg,i);
}
}
|