| // Copyright 2011 The Apache Software Foundation |
| // |
| // 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.tapestry5.internal.plastic; |
| |
| import org.apache.tapestry5.plastic.FieldHandle; |
| |
| public class FieldHandleImpl implements FieldHandle |
| { |
| private final String className, fieldName; |
| |
| private final int fieldIndex; |
| |
| protected volatile PlasticClassHandleShim shim; |
| |
| public FieldHandleImpl(String className, String fieldName, int fieldIndex) |
| { |
| this.className = className; |
| this.fieldName = fieldName; |
| this.fieldIndex = fieldIndex; |
| } |
| |
| @Override |
| public String toString() |
| { |
| return String.format("FieldHandle[%s#%s]", className, fieldName); |
| } |
| |
| @Override |
| public Object get(Object instance) |
| { |
| checkNullInstance(instance, "get"); |
| |
| return shim.get(instance, fieldIndex); |
| } |
| |
| private void checkNullInstance(Object instance, String action) |
| { |
| if (instance == null) |
| throw new NullPointerException(String.format( |
| "Unable to %s value of field %s of class %s, as provided instance is null.", action, fieldName, |
| className)); |
| } |
| |
| @Override |
| public void set(Object instance, Object newValue) |
| { |
| checkNullInstance(instance, "set"); |
| |
| shim.set(instance, fieldIndex, newValue); |
| } |
| } |