- /*
- * Copyright 2001-2004 The Apache Software Foundation.
- *
- * Licensed 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 org.apache.commons.betwixt.expression;
-
- /** <p><code>VariableExpression</code> represents a variable expression such as
- * <code>$foo</code> which returns the value of the given variable.</p>
- *
- * @author <a href="mailto:jstrachan@apache.org">James Strachan</a>
- * @version $Revision: 1.6 $
- */
- public class VariableExpression implements Expression {
-
- /** The variable name */
- private String variableName;
-
- /** Base constructor */
- public VariableExpression() {
- }
-
- /**
- * Convenience constructor sets <code>VariableName</code> property
- * @param variableName the name of the context variable
- * whose value will be returned by an evaluation
- */
- public VariableExpression(String variableName) {
- this.variableName = variableName;
- }
-
- /** Return the value of a context variable.
- *
- * @param context evaluate against this context
- * @return the value of the context variable named by the <code>VariableName</code> property
- */
- public Object evaluate(Context context) {
- return context.getVariable( variableName );
- }
-
- /**
- * Gets the variable name
- * @return the name of the context variable whose value will be returned by an evaluation
- */
- public String getVariableName() {
- return variableName;
- }
-
- /**
- * Sets the variable name
- * @param variableName the name of the context variable
- * whose value will be returned by an evaluation
- */
- public void setVariableName(String variableName) {
- this.variableName = variableName;
- }
-
- /**
- * Do nothing
- * @see org.apache.commons.betwixt.expression.Expression
- */
- public void update(Context context, String newValue) {
- // do nothing
- }
-
- /**
- * Returns something useful for logging
- * @return something useful for logging
- */
- public String toString() {
- return "VariableExpression [variable name=" + variableName + "]";
- }
- }