Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||||||
UniqueToken |
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| 2.0;2 |
1 | // Copyright 2004, 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.script; |
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16 | ||
17 | import org.apache.hivemind.Location; |
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18 | import org.apache.tapestry.IRequestCycle; |
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19 | ||
20 | /** |
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21 | * Writes out its child tokens only the first time it executes |
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22 | * (with a given tag). Uses |
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23 | * {@link org.apache.tapestry.IRequestCycle#setAttribute(String, Object)} |
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24 | * to identify whether a particular block has rendered yet. |
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25 | * |
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26 | * @author Howard Lewis Ship |
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27 | * @since 3.0 |
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28 | */ |
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29 | ||
30 | class UniqueToken extends AbstractToken |
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31 | { |
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32 | public UniqueToken(Location location) |
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33 | { |
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34 | 2 | super(location); |
35 | 2 | } |
36 | ||
37 | public void write(StringBuffer buffer, ScriptSession session) |
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38 | { |
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39 | 4 | IRequestCycle cycle = session.getRequestCycle(); |
40 | ||
41 | 4 | Location location = getLocation(); |
42 | 4 | String tag = "<unique> " + location.toString(); |
43 | ||
44 | 4 | if (cycle.getAttribute(tag) != null) |
45 | 2 | return; |
46 | ||
47 | 2 | cycle.setAttribute(tag, Boolean.TRUE); |
48 | ||
49 | 2 | writeChildren(buffer, session); |
50 | 2 | } |
51 | ||
52 | } |