Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||||||
DeferredObjectImpl |
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1 | // Copyright 2005 The Apache Software Foundation |
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2 | // |
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3 | // Licensed under the Apache License, Version 2.0 (the "License"); |
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4 | // you may not use this file except in compliance with the License. |
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5 | // You may obtain a copy of the License at |
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6 | // |
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7 | // http://www.apache.org/licenses/LICENSE-2.0 |
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8 | // |
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9 | // Unless required by applicable law or agreed to in writing, software |
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10 | // distributed under the License is distributed on an "AS IS" BASIS, |
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11 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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12 | // See the License for the specific language governing permissions and |
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13 | // limitations under the License. |
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14 | ||
15 | package org.apache.tapestry.services.impl; |
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16 | ||
17 | import org.apache.hivemind.Location; |
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18 | import org.apache.hivemind.internal.Module; |
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19 | import org.apache.hivemind.schema.Translator; |
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20 | ||
21 | /** |
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22 | * An encapsulation of an invocation of |
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23 | * {@link org.apache.hivemind.schema.Translator#translate(org.apache.hivemind.internal.Module, java.lang.Class, java.lang.String, org.apache.hivemind.Location)}, |
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24 | * allowing the actual invocation (and all the object creation, etc., that entails) to be deferred, |
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25 | * or even avoided all together. |
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26 | * |
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27 | * @author Howard M. Lewis Ship |
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28 | * @since 4.0 |
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29 | */ |
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30 | public class DeferredObjectImpl implements DeferredObject |
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31 | { |
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32 | private final Module _module; |
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33 | ||
34 | private final Translator _objectTranslator; |
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35 | ||
36 | private final String _objectReference; |
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37 | ||
38 | private final Location _location; |
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39 | ||
40 | private Object _object; |
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41 | ||
42 | public DeferredObjectImpl(final Translator objectTranslator, final Module module, |
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43 | final String objectReference, final Location location) |
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44 | 2 | { |
45 | 2 | _objectTranslator = objectTranslator; |
46 | 2 | _module = module; |
47 | 2 | _objectReference = objectReference; |
48 | 2 | _location = location; |
49 | 2 | } |
50 | ||
51 | public synchronized Object getObject() |
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52 | { |
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53 | 4 | if (_object == null) |
54 | 2 | _object = _objectTranslator.translate( |
55 | _module, |
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56 | 1 | Object.class, |
57 | _objectReference, |
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58 | _location); |
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59 | ||
60 | 4 | return _object; |
61 | } |
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62 | ||
63 | public Location getLocation() |
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64 | { |
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65 | 2 | return _location; |
66 | } |
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67 | } |