| /* |
| * 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. |
| */ |
| package javax.el; |
| |
| import java.beans.FeatureDescriptor; |
| import java.lang.reflect.Constructor; |
| import java.lang.reflect.Field; |
| import java.lang.reflect.InvocationTargetException; |
| import java.lang.reflect.Method; |
| import java.lang.reflect.Modifier; |
| import java.util.Iterator; |
| |
| /** |
| * @since EL 3.0 |
| */ |
| public class StaticFieldELResolver extends ELResolver { |
| |
| @Override |
| public Object getValue(ELContext context, Object base, Object property) { |
| |
| if (context == null) { |
| throw new NullPointerException(); |
| } |
| |
| if (base instanceof ELClass && property instanceof String) { |
| context.setPropertyResolved(base, property); |
| |
| Class<?> clazz = ((ELClass) base).getKlass(); |
| String name = (String) property; |
| Exception exception = null; |
| try { |
| Field field = clazz.getField(name); |
| int modifiers = field.getModifiers(); |
| if (Modifier.isStatic(modifiers) && |
| Modifier.isPublic(modifiers)) { |
| return field.get(null); |
| } |
| } catch (IllegalArgumentException | IllegalAccessException |
| | NoSuchFieldException | SecurityException e) { |
| exception = e; |
| } |
| String msg = Util.message(context, "staticFieldELResolver.notFound", |
| name, clazz.getName()); |
| if (exception == null) { |
| throw new PropertyNotFoundException(msg); |
| } else { |
| throw new PropertyNotFoundException(msg, exception); |
| } |
| } |
| return null; |
| } |
| |
| |
| @Override |
| public void setValue(ELContext context, Object base, Object property, |
| Object value) { |
| |
| if (context == null) { |
| throw new NullPointerException(); |
| } |
| |
| if (base instanceof ELClass && property instanceof String) { |
| Class<?> clazz = ((ELClass) base).getKlass(); |
| String name = (String) property; |
| |
| throw new PropertyNotWritableException(Util.message(context, |
| "staticFieldELResolver.notWriteable", name, |
| clazz.getName())); |
| } |
| } |
| |
| |
| @Override |
| public Object invoke(ELContext context, Object base, Object method, |
| Class<?>[] paramTypes, Object[] params) { |
| |
| if (context == null) { |
| throw new NullPointerException(); |
| } |
| |
| if (base instanceof ELClass && method instanceof String) { |
| context.setPropertyResolved(base, method); |
| |
| Class<?> clazz = ((ELClass) base).getKlass(); |
| String methodName = (String) method; |
| |
| if ("<init>".equals(methodName)) { |
| Constructor<?> match = |
| Util.findConstructor(clazz, paramTypes, params); |
| |
| Object[] parameters = Util.buildParameters( |
| match.getParameterTypes(), match.isVarArgs(), params); |
| |
| Object result = null; |
| |
| try { |
| result = match.newInstance(parameters); |
| } catch (IllegalArgumentException | IllegalAccessException | |
| InstantiationException e) { |
| throw new ELException(e); |
| } catch (InvocationTargetException e) { |
| Throwable cause = e.getCause(); |
| Util.handleThrowable(cause); |
| throw new ELException(cause); |
| } |
| return result; |
| |
| } else { |
| Method match = |
| Util.findMethod(clazz, methodName, paramTypes, params); |
| |
| int modifiers = match.getModifiers(); |
| if (!Modifier.isStatic(modifiers)) { |
| throw new MethodNotFoundException(Util.message(context, |
| "staticFieldELResolver.methodNotFound", methodName, |
| clazz.getName())); |
| } |
| |
| Object[] parameters = Util.buildParameters( |
| match.getParameterTypes(), match.isVarArgs(), params); |
| |
| Object result = null; |
| try { |
| result = match.invoke(null, parameters); |
| } catch (IllegalArgumentException | IllegalAccessException e) { |
| throw new ELException(e); |
| } catch (InvocationTargetException e) { |
| Throwable cause = e.getCause(); |
| Util.handleThrowable(cause); |
| throw new ELException(cause); |
| } |
| return result; |
| } |
| } |
| return null; |
| } |
| |
| @Override |
| public Class<?> getType(ELContext context, Object base, Object property) { |
| if (context == null) { |
| throw new NullPointerException(); |
| } |
| |
| if (base instanceof ELClass && property instanceof String) { |
| context.setPropertyResolved(base, property); |
| |
| Class<?> clazz = ((ELClass) base).getKlass(); |
| String name = (String) property; |
| Exception exception = null; |
| try { |
| Field field = clazz.getField(name); |
| int modifiers = field.getModifiers(); |
| if (Modifier.isStatic(modifiers) && |
| Modifier.isPublic(modifiers)) { |
| return field.getType(); |
| } |
| } catch (IllegalArgumentException | NoSuchFieldException | |
| SecurityException e) { |
| exception = e; |
| } |
| String msg = Util.message(context, "staticFieldELResolver.notFound", |
| name, clazz.getName()); |
| if (exception == null) { |
| throw new PropertyNotFoundException(msg); |
| } else { |
| throw new PropertyNotFoundException(msg, exception); |
| } |
| } |
| return null; |
| } |
| |
| |
| @Override |
| public boolean isReadOnly(ELContext context, Object base, Object property) { |
| if (context == null) { |
| throw new NullPointerException(); |
| } |
| |
| if (base instanceof ELClass && property instanceof String) { |
| context.setPropertyResolved(base, property); |
| } |
| return true; |
| } |
| |
| |
| /** |
| * Always returns <code>null</code>. |
| */ |
| @Override |
| public Iterator<FeatureDescriptor> getFeatureDescriptors(ELContext context, |
| Object base) { |
| return null; |
| } |
| |
| /** |
| * Always returns <code>String.class</code>. |
| */ |
| @Override |
| public Class<?> getCommonPropertyType(ELContext context, Object base) { |
| return String.class; |
| } |
| } |