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org.apache.commons.jelly.expression.ConstantExpression |
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1 | /* |
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2 | * Copyright 2002,2004 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.jelly.expression; |
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17 | ||
18 | import org.apache.commons.jelly.JellyContext; |
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19 | ||
20 | /** <p><code>ConstantExpression</code> represents a constant expression.</p> |
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21 | * |
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22 | * <p> In other words, {@link #evaluate} returns a value independent of the context. </p> |
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23 | * |
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24 | * @author <a href="mailto:jstrachan@apache.org">James Strachan</a> |
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25 | * @version $Revision: 155420 $ |
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26 | */ |
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27 | public class ConstantExpression extends ExpressionSupport { |
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28 | ||
29 | /** The value of this expression */ |
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30 | private Object value; |
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31 | ||
32 | /** Base constructor |
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33 | */ |
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34 | 0 | public ConstantExpression() { |
35 | 0 | } |
36 | ||
37 | /** Convenience constructor sets <code>value</code> property. |
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38 | */ |
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39 | 47203 | public ConstantExpression(Object value) { |
40 | 47203 | this.value = value; |
41 | 47203 | } |
42 | ||
43 | public String toString() { |
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44 | 0 | return super.toString() + "[value=" + value +"]"; |
45 | } |
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46 | ||
47 | public String getExpressionText() { |
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48 | 169 | return value == null ? "null" : value.toString(); |
49 | } |
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50 | ||
51 | /** |
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52 | * Evaluate expression against given context. |
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53 | * |
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54 | * @param context evaluate expression against this context |
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55 | * @return current value of <code>value</code> property |
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56 | */ |
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57 | public Object evaluate(JellyContext context) { |
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58 | 9230 | return value; |
59 | } |
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60 | ||
61 | /** Gets the constant value of this expression */ |
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62 | public Object getValue() { |
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63 | 27768 | return value; |
64 | } |
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65 | ||
66 | /** Sets the constant value of this expression */ |
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67 | public void setValue(Object value) { |
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68 | 0 | this.value = value; |
69 | 0 | } |
70 | } |
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