| package org.apache.commons.ognl; |
| |
| /* |
| * 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.lang.reflect.Field; |
| import java.lang.reflect.Modifier; |
| |
| /** |
| * $Id$ |
| */ |
| public class ASTStaticField |
| extends SimpleNode |
| implements NodeType |
| { |
| |
| private String className; |
| |
| private String fieldName; |
| |
| private Class getterClass; |
| |
| public ASTStaticField( int id ) |
| { |
| super( id ); |
| } |
| |
| public ASTStaticField( OgnlParser p, int id ) |
| { |
| super( p, id ); |
| } |
| |
| /** Called from parser action. */ |
| void init( String className, String fieldName ) |
| { |
| this.className = className; |
| this.fieldName = fieldName; |
| } |
| |
| protected Object getValueBody( OgnlContext context, Object source ) |
| throws OgnlException |
| { |
| return OgnlRuntime.getStaticField( context, className, fieldName ); |
| } |
| |
| public boolean isNodeConstant( OgnlContext context ) |
| throws OgnlException |
| { |
| boolean result = false; |
| Exception cause = null; |
| |
| try |
| { |
| Class clazz = OgnlRuntime.classForName( context, className ); |
| |
| /* |
| * Check for virtual static field "class"; this cannot interfere with normal static fields because it is a |
| * reserved word. It is considered constant. |
| */ |
| if ( "class".equals( fieldName ) ) |
| { |
| result = true; |
| } |
| else if ( clazz.isEnum() ) |
| { |
| result = true; |
| } |
| else |
| { |
| Field field = clazz.getField( fieldName ); |
| |
| if ( !Modifier.isStatic( field.getModifiers() ) ) |
| { |
| throw new OgnlException( "Field " + fieldName + " of class " + className + " is not static" ); |
| } |
| result = Modifier.isFinal( field.getModifiers() ); |
| } |
| } |
| catch ( ClassNotFoundException | SecurityException | NoSuchFieldException e ) |
| { |
| cause = e; |
| } |
| |
| if ( cause != null ) |
| { |
| throw new OgnlException( "Could not get static field " + fieldName + " from class " + className, cause ); |
| } |
| |
| return result; |
| } |
| |
| Class getFieldClass( OgnlContext context ) |
| throws OgnlException |
| { |
| Exception cause; |
| |
| try |
| { |
| Class clazz = OgnlRuntime.classForName( context, className ); |
| |
| /* |
| * Check for virtual static field "class"; this cannot interfere with normal static fields because it is a |
| * reserved word. It is considered constant. |
| */ |
| if ( "class".equals( fieldName ) ) |
| { |
| return clazz; |
| } |
| if ( clazz.isEnum() ) |
| { |
| return clazz; |
| } |
| Field field = clazz.getField( fieldName ); |
| |
| return field.getType(); |
| } |
| catch ( ClassNotFoundException | SecurityException | NoSuchFieldException e ) |
| { |
| cause = e; |
| } |
| throw new OgnlException( "Could not get static field " + fieldName + " from class " + className, cause ); |
| } |
| |
| public Class getGetterClass() |
| { |
| return getterClass; |
| } |
| |
| public Class getSetterClass() |
| { |
| return getterClass; |
| } |
| |
| public String toGetSourceString( OgnlContext context, Object target ) |
| { |
| try |
| { |
| |
| Object obj = OgnlRuntime.getStaticField( context, className, fieldName ); |
| |
| context.setCurrentObject( obj ); |
| |
| getterClass = getFieldClass( context ); |
| |
| context.setCurrentType( getterClass ); |
| |
| } |
| catch ( Throwable t ) |
| { |
| throw OgnlOps.castToRuntime( t ); |
| } |
| |
| return className + "." + fieldName; |
| } |
| |
| public String toSetSourceString( OgnlContext context, Object target ) |
| { |
| try |
| { |
| |
| Object obj = OgnlRuntime.getStaticField( context, className, fieldName ); |
| |
| context.setCurrentObject( obj ); |
| |
| getterClass = getFieldClass( context ); |
| |
| context.setCurrentType( getterClass ); |
| |
| } |
| catch ( Throwable t ) |
| { |
| throw OgnlOps.castToRuntime( t ); |
| } |
| |
| return className + "." + fieldName; |
| } |
| |
| public <R, P> R accept( NodeVisitor<? extends R, ? super P> visitor, P data ) |
| throws OgnlException |
| { |
| return visitor.visit( this, data ); |
| } |
| |
| /** |
| * Get the field name for this field. |
| * |
| * @return the field name. |
| * @since 4.0 |
| */ |
| String getFieldName() |
| { |
| return fieldName; |
| } |
| |
| /** |
| * Get the class name for this field. |
| * |
| * @return the class name. |
| * @since 4.0 |
| */ |
| String getClassName() |
| { |
| return className; |
| } |
| } |