| <!-- |
| 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. |
| --> |
| $Id$ |
| |
| Commons JEXL Package |
| Version 2.0 |
| Release Notes |
| |
| |
| INTRODUCTION: |
| ============= |
| |
| JEXL is an Expression Language supporting most of the constructs in the |
| JSTL Expression Language, along with some additional extensions. |
| |
| http://commons.apache.org/jexl/ |
| |
| Changes in this version include: |
| |
| Incompatible Changes |
| ==================== |
| |
| Now requires Java 1.5 or later. |
| |
| Version 2.0 resides in the org.apache.commons.jexl2 package; part of the version 1.x API is reimplemented as an |
| add-on source library in the jexl-compat directory; since it can not fully reimplement the original public 1.x, it may |
| only be used to ease transition in strictly controlled deployments. |
| |
| The following classes are implemented through the jexl-compat source library: |
| * ExpressionFactory |
| * ScriptFactory |
| * Expression |
| * Script |
| * JexlContext |
| * JexlHelper |
| |
| Migration notes |
| =============== |
| |
| When migrating from jexl 1.x to jexl 2.0, the following hints may be helpfull. |
| |
| The following classes no longer exist: |
| * ExpressionFactory, ScriptFactory: create a JexlEngine and use createExpression() or createScript() |
| instead. |
| |
| The following classes have been renamed and replaced: |
| |
| * VelMethod <=> JexlMethod |
| * VelPropertyGet <=> JexlPropertyGet |
| * VelPropertySet <=> JexlPropertySet |
| |
| The following methods have been removed: |
| |
| * Info.getTemplateName() - use Info.getName() instead |
| * Expression.addPostResolver() / Expression.addPreResolver() - set ant-like variables in JexlContext, implement |
| a specific JexlContext or derive JexlcontextInterpreter/JexlEngine instead |
| |
| Behavior changes |
| ================ |
| |
| * Public fields are considered when using JexlPropertyGet / JexlPropertySet: Jexl 1.x behavior can be reimplemented |
| by subclassing UberspectImpl. |
| |
| *Division (/ operator) behavior change: division between integers no longer casts its operands to double; integer division |
| allways results in a integer. The 1.x behavior can be reimplemented by subclassing JexlArithmetic. |
| |
| New Features: |
| ============= |
| |
| Assignment expression: a = b (and a.b.c = d) |
| * Assigns a variable (ant-like variable or bean-property) |
| |
| Ternary operator expression: a ? b : c (and a ?: c) |
| * The usual inline conditional shortcut and its 'Elvis' form (a ?: b evaluates as a ? a : b) |
| |
| Constructor call expression: new('my.class.name', arguments...) |
| * Creates a new instance of a class using the most appropriate constructor according |
| to the actual arguments |
| |
| Function namespace: ns:func(arguments...) |
| * A function namespace allows the use of class or instance methods in function calls |
| |
| UnifiedJEXL |
| * Adds ${...} and #{...} JSP/EL syntax support on top of the JexlEngine |
| |
| JSR-223 support |
| * Implement JSR-223 Scripting Engine for JEXL script (need BSF-3.0 on Java < 6) |
| |
| Error and exception handling |
| * Configuring the leniency and verbosity of the Jexl engine allows user control over the |
| error handling policy |
| |
| Bugs fixed: |
| =========== |
| |
| * JEXL-90: Jexl parser allows invalid expressions, e.g. "a=1 b=2 3" |
| * JEXL-88: MethodKey.java - name clash getMostSpecific() with Java 1.5.0 |
| * JEXL-87: Inconsistent behaviour of arithmetical operations |
| * JEXL-81: Introspector does not use ListGetExecutor for List |
| * JEXL-80: Lenient mode should not throw exception when {g,s}etting an undefined property |
| * JEXL-78: Ternary operator throws Exception when JexlEngine in strict mode |
| * JEXL-76: Remove unnecessary class VisitorAdapter |
| * JEXL-71: Parsing errors? |
| * JEXL-67: Potential NPE in util.introspection.MethodKey |
| * JEXL-66: testDottedNames expects map enumeration order |
| * JEXL-64: Inconsistent behaviour of dotted names |
| * JEXL-62: NPE in Interpreter |
| * JEXL-59: ClassMap holds a reference to class |
| * JEXL-56: Logging wrongly uses java.util.logging |
| * JEXL-50: Div operator does not do integer division |
| * JEXL-49: Block statements aren't parsed |
| * JEXL-48: NPE during expression evaluation |
| * JEXL-45: Unhandled division by zero |
| * JEXL-42: NullPointerException evaluating an expression |
| * JEXL-40: JEXL fails to find abstract public methods in the base class if overridden by non-public derived types |
| * JEXL-32: BigDecimal values are treated as Long values which results in loss of precision |
| * JEXL-30: ASTAddNode does not add BigDecimal objects correctly |
| * JEXL-27: Cannot assign a value to the property of an object, such as object.prop = value. |
| * JEXL-26: ASTArrayAccess messes up on fallback to JexlContext |
| * JEXL-19: Ternary conditional not supported |
| * JEXL-3 : Static method resolution and changes to context |
| |
| Other issues fixed (Improvements/New Features): |
| =============================================== |
| |
| * JEXL-95: Enhance JSR-223 implementation |
| * JEXL-94: Allow stateful namespaces (ns:function) |
| * JEXL-93: Add public fields as targets of set/get property |
| * JEXL-92: JexlContext API should be more flexible |
| * JEXL-89: Drop main() and suite() methods from Test cases |
| * JEXL-85: 2.0 grammar finishing touches & debugger update |
| * JEXL-82: Change foreach syntax |
| * JEXL-77: Rename last Velocity originated classes |
| * JEXL-72: Remove deprecated classes and methods entirely |
| * JEXL-70: Add main class to allow scripts etc to be tested |
| * JEXL-63: JSR-223 support |
| * JEXL-61: Usage of strong references on Method/Constructor & WeakHashMap usage |
| * JEXL-60: Refactor o.a.c.jexl.util and o.a.c.jexl.util.introspection |
| * JEXL-58: UnifiedJEXL |
| * JEXL-57: Change pom.xml to make it Netbeans Maven2 plugin friendly |
| * JEXL-55: JEXL 2.0 redux, attempting to restart the effort to release 2.0 |
| * JEXL-54: Light performance enhancements |
| * JEXL-47: Allow single-line comments with // |
| * JEXL-43: Website overview does not mention method calls and new 2.0 features |
| * JEXL-41: Allow nested ${} evaluation |
| * JEXL-35: Final API requirements |
| * JEXL-34: Remove pre and post resolution of variables via the JexlExprResolver classes. |
| * JEXL-33: Remove unnecessary throws Exception from various classes |
| * JEXL-29: Support non-object-level functions/methods, as size and empty function |
| * JEXL-25: Call method with varargs |
| * JEXL-24: Support Long for integer literal instead of Integers |
| * JEXL-21: operator overloading / hooks on operator processing |
| * JEXL-16: allowing quote escaping |
| * JEXL-15: Needs definable functions |
| * JEXL-11: Don't make null convertible into anything |
| * JEXL-10: Make possible checking for unresolved variables |
| |
| Other Changes: |
| ============== |
| |
| o Add @since 2.0 tags to code so we can track API additions via Javadoc |
| |
