| // Copyright 2004 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.tapestry.bean; |
| |
| import java.lang.reflect.Field; |
| |
| import org.apache.tapestry.ApplicationRuntimeException; |
| import org.apache.tapestry.IBeanProvider; |
| import org.apache.tapestry.IResourceResolver; |
| import org.apache.tapestry.Tapestry; |
| |
| /** |
| * Initializes a bean with the value of a public static field. |
| * |
| * @author Howard Lewis Ship |
| * @version $Id$ |
| * @since 1.0.8 |
| * |
| **/ |
| |
| public class FieldBeanInitializer extends AbstractBeanInitializer |
| { |
| protected String _fieldName; |
| protected Object _fieldValue; |
| private boolean _fieldResolved = false; |
| |
| public synchronized void setBeanProperty(IBeanProvider provider, Object bean) |
| { |
| IResourceResolver resolver = provider.getResourceResolver(); |
| |
| if (!_fieldResolved) |
| resolveField(resolver); |
| |
| setBeanProperty(resolver, bean, _fieldValue); |
| } |
| |
| private void resolveField(IResourceResolver resolver) |
| { |
| if (_fieldResolved) |
| return; |
| |
| // This is all copied out of of FieldBinding!! |
| |
| int dotx = _fieldName.lastIndexOf('.'); |
| |
| if (dotx < 0) |
| throw new ApplicationRuntimeException( |
| Tapestry.format("invalid-field-name", _fieldName)); |
| |
| String className = _fieldName.substring(0, dotx); |
| String simpleFieldName = _fieldName.substring(dotx + 1); |
| |
| // Simple class names are assumed to be in the java.lang package. |
| |
| if (className.indexOf('.') < 0) |
| className = "java.lang." + className; |
| |
| Class targetClass = null; |
| |
| try |
| { |
| targetClass = resolver.findClass(className); |
| } |
| catch (Throwable t) |
| { |
| throw new ApplicationRuntimeException( |
| Tapestry.format("unable-to-resolve-class", className), |
| t); |
| } |
| |
| Field field = null; |
| |
| try |
| { |
| field = targetClass.getField(simpleFieldName); |
| } |
| catch (NoSuchFieldException ex) |
| { |
| throw new ApplicationRuntimeException( |
| Tapestry.format("field-not-defined", _fieldName), |
| ex); |
| } |
| |
| // Get the value of the field. null means look for it as a static |
| // variable. |
| |
| try |
| { |
| _fieldValue = field.get(null); |
| } |
| catch (IllegalAccessException ex) |
| { |
| throw new ApplicationRuntimeException( |
| Tapestry.format("illegal-field-access", _fieldName), |
| ex); |
| } |
| catch (NullPointerException ex) |
| { |
| throw new ApplicationRuntimeException( |
| Tapestry.format("field-is-instance", _fieldName), |
| ex); |
| } |
| |
| _fieldResolved = true; |
| } |
| |
| } |