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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.apache.org/licenses/LICENSE-2.0
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* An <code>Expression</code> that refers to a method on an object.
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* <code>The {@link ExpressionFactory#createMethodExpression} method
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* can be used to parse an expression string and return a concrete instance
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* of <code>MethodExpression</code> that encapsulates the parsed expression.
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* The {@link FunctionMapper} is used at parse time, not evaluation time,
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* so one is not needed to evaluate an expression using this class.
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* The {@link FunctionMapper} is used at parse time, not evaluation time,
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* so one is not needed to evaluate an expression using this class.
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* However, the {@link ELContext} is needed at evaluation time.</p>
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* <p>The {@link #getMethodInfo} and {@link #invoke} methods will evaluate the
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* expression each time they are called. The {@link ELResolver} in the
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* <code>ELContext</code> is used to resolve the top-level variables and to
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* determine the behavior of the <code>.</code> and <code>[]</code>
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* operators. For any of the two methods, the {@link ELResolver#getValue}
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* method is used to resolve all properties up to but excluding the last
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* <p>The {@link #getMethodInfo} and {@link #invoke} methods will evaluate the
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* expression each time they are called. The {@link ELResolver} in the
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* <code>ELContext</code> is used to resolve the top-level variables and to
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* determine the behavior of the <code>.</code> and <code>[]</code>
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* operators. For any of the two methods, the {@link ELResolver#getValue}
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* method is used to resolve all properties up to but excluding the last
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* one. This provides the <code>base</code> object on which the method
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* appears. If the <code>base</code> object is null, a
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* <code>NullPointerException</code> must be thrown. At the last resolution,
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* appears. If the <code>base</code> object is null, a
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* <code>NullPointerException</code> must be thrown. At the last resolution,
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* the final <code>property</code> is then coerced to a <code>String</code>,
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* which provides the name of the method to be found. A method matching the
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* name and expected parameters provided at parse time is found and it is
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* which provides the name of the method to be found. A method matching the
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* name and expected parameters provided at parse time is found and it is
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* either queried or invoked (depending on the method called on this
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* <code>MethodExpression</code>).</p>
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* <p>See the notes about comparison, serialization and immutability in
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* <p>See the notes about comparison, serialization and immutability in
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* the {@link Expression} javadocs.
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* @see javax.el.ELResolver
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* @see javax.el.Expression
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* @see javax.el.ExpressionFactory
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* @see javax.el.MethodExpression
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* @author Jacob Hookom [jacob@hookom.net]
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* @version $Id: MethodExpressionImpl.java 939519 2010-04-30 00:12:23Z kkolinko $
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public final class MethodExpressionImpl extends MethodExpression implements
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* Returns the original String used to create this <code>Expression</code>,
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* This is used for debugging purposes but also for the purposes of
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* comparison (e.g. to ensure the expression in a configuration file has not
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* This method does not provide sufficient information to re-create an
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* expression. Two different expressions can have exactly the same
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* expression string but different function mappings. Serialization should
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* be used to save and restore the state of an <code>Expression</code>.
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* @return The original expression String.
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* @see javax.el.Expression#getExpressionString()
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public String getExpressionString() {
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java/org/apache/el/MethodExpressionImpl.java
