- /*
- * 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>ConstantExpression</code> represents a constant expression.</p>
- *
- * <p> In other words, {@link #evaluate} returns a value independent of the context. </p>
- *
- * @author <a href="mailto:jstrachan@apache.org">James Strachan</a>
- * @version $Revision: 1.6 $
- */
- public class ConstantExpression implements Expression {
-
- /** The value of this expression */
- private Object value;
-
- /** Base constructor
- */
- public ConstantExpression() {
- }
-
- /**
- * Convenience constructor sets <code>value</code> property.
- * @param value the Object which is the constant value for this expression
- */
- public ConstantExpression(Object value) {
- this.value = value;
- }
-
- /**
- * Evaluate expression against given context.
- *
- * @param context evaluate expression against this context
- * @return current value of <code>value</code> property
- */
- public Object evaluate(Context context) {
- return value;
- }
-
- /**
- * Do nothing
- * @see org.apache.commons.betwixt.expression.Expression
- */
- public void update(Context context, String newValue) {
- // do nothing
- }
-
- /**
- * Gets the constant value of this expression
- * @return this expression's constant value
- */
- public Object getValue() {
- return value;
- }
-
- /**
- * Sets the constant value of this expression
- * @param value the constant value for this expression
- */
- public void setValue(Object value) {
- this.value = value;
- }
-
- /**
- * Returns something useful for logging
- * @return something useful for logging
- */
- public String toString() {
- return "ConstantExpression [value=" + value + "]";
- }
- }