001 package org.apache.commons.ognl.enhance; 002 003 /* 004 * Licensed to the Apache Software Foundation (ASF) under one 005 * or more contributor license agreements. See the NOTICE file 006 * distributed with this work for additional information 007 * regarding copyright ownership. The ASF licenses this file 008 * to you under the Apache License, Version 2.0 (the 009 * "License"); you may not use this file except in compliance 010 * with the License. You may obtain a copy of the License at 011 * 012 * http://www.apache.org/licenses/LICENSE-2.0 013 * 014 * Unless required by applicable law or agreed to in writing, 015 * software distributed under the License is distributed on an 016 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 017 * KIND, either express or implied. See the License for the 018 * specific language governing permissions and limitations 019 * under the License. 020 */ 021 022 import org.apache.commons.ognl.Node; 023 import org.apache.commons.ognl.OgnlContext; 024 025 /** 026 * Provides pure java expression paths to get/set values from an ognl expression. This is achieved by taking an existing 027 * {@link Node} parsed expression and using bytecode enhancements to do the same work using pure java vs the ognl 028 * interpreter. 029 */ 030 public interface ExpressionAccessor 031 { 032 033 /** 034 * Gets the value represented by this expression path, if any. 035 * 036 * @param context The standard ognl context used for variable substitution/etc. 037 * @param target The root object this expression is meant for. 038 * @return The evaluated value, if any. 039 */ 040 Object get( OgnlContext context, Object target ); 041 042 /** 043 * Sets the value represented by this expression path, if possible. 044 * 045 * @param context The standard ognl context used for variable substitution/etc. 046 * @param target The root object this expression is meant for. 047 * @param value The new value to set if this expression references a settable property. 048 */ 049 void set( OgnlContext context, Object target, Object value ); 050 051 /** 052 * Used to set the original root expression node on instances where the compiled version has to fall back to 053 * interpreted syntax because of compilation failures. 054 * 055 * @param expression The root expression node used to generate this accessor. 056 */ 057 void setExpression( Node expression ); 058 }