| Classes in this File | Line Coverage | Branch Coverage | Complexity | |||||||
| EmptyExpression |
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| 1.0;1 |
| 1 | /* |
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| 2 | * Copyright 2001-2004 The Apache Software Foundation. |
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| 3 | * |
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| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
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| 5 | * you may not use this file except in compliance with the License. |
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| 6 | * You may obtain a copy of the License at |
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| 7 | * |
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| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
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| 9 | * |
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| 10 | * Unless required by applicable law or agreed to in writing, software |
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| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
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| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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| 13 | * See the License for the specific language governing permissions and |
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| 14 | * limitations under the License. |
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| 15 | */ |
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| 16 | package org.apache.commons.betwixt.expression; |
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| 17 | ||
| 18 | /** <p><code>EmptyExpression</code> returns the same value as is passed in. </p> |
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| 19 | * |
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| 20 | * <p> See {@link #evaluate}. </p> |
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| 21 | * |
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| 22 | * @author <a href="mailto:jstrachan@apache.org">James Strachan</a> |
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| 23 | * @version $Revision: 155402 $ |
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| 24 | */ |
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| 25 | 123 | public class EmptyExpression implements Expression { |
| 26 | ||
| 27 | /** Don't need more than one <code>EmptyExpression</code>*/ |
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| 28 | 123 | private static final EmptyExpression singleton = new EmptyExpression(); |
| 29 | ||
| 30 | /** |
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| 31 | * Gets the singleton instance. |
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| 32 | * @return the EmptyExpression singleton. |
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| 33 | */ |
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| 34 | public static EmptyExpression getInstance() { |
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| 35 | 291 | return singleton; |
| 36 | } |
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| 37 | ||
| 38 | /** Should this be private? |
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| 39 | */ |
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| 40 | 123 | public EmptyExpression() { |
| 41 | 123 | } |
| 42 | ||
| 43 | /** Return the bean we're evaluating. |
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| 44 | * @see org.apache.commons.betwixt.expression.Expression |
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| 45 | */ |
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| 46 | public Object evaluate(Context context) { |
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| 47 | 357 | return context.getBean(); |
| 48 | } |
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| 49 | ||
| 50 | /** Do nothing |
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| 51 | * @see org.apache.commons.betwixt.expression.Expression |
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| 52 | */ |
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| 53 | public void update(Context context, String newValue) { |
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| 54 | // do nothing |
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| 55 | 0 | } |
| 56 | ||
| 57 | /** |
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| 58 | * Return something useful for logging. |
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| 59 | * @return short name for this class |
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| 60 | */ |
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| 61 | public String toString() { |
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| 62 | 0 | return "EmptyExpression"; |
| 63 | } |
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| 64 | ||
| 65 | } |