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1 //
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2 // MessagePack for Java
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3 //
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4 // Copyright (C) 2009 - 2013 FURUHASHI Sadayuki
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5 //
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6 // Licensed under the Apache License, Version 2.0 (the "License");
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7 // you may not use this file except in compliance with the License.
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8 // You may obtain a copy of the License at
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9 //
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10 // http://www.apache.org/licenses/LICENSE-2.0
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11 //
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12 // Unless required by applicable law or agreed to in writing, software
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13 // distributed under the License is distributed on an "AS IS" BASIS,
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14 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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15 // See the License for the specific language governing permissions and
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16 // limitations under the License.
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17 //
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18 package org.msgpack.template;
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19
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20 import java.io.IOException;
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21 import java.util.Map;
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22 import java.util.HashMap;
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23 import org.msgpack.packer.Packer;
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24 import org.msgpack.unpacker.Unpacker;
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25 import org.msgpack.MessageTypeException;
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26
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27 public class MapTemplate<K, V> extends AbstractTemplate<Map<K, V>> {
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28 private Template<K> keyTemplate;
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29 private Template<V> valueTemplate;
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30
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31 public MapTemplate(Template<K> keyTemplate, Template<V> valueTemplate) {
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32 this.keyTemplate = keyTemplate;
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33 this.valueTemplate = valueTemplate;
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34 }
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35
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36 public void write(Packer pk, Map<K, V> target, boolean required)
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37 throws IOException {
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38 if (!(target instanceof Map)) {
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39 if (target == null) {
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40 if (required) {
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41 throw new MessageTypeException("Attempted to write null");
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42 }
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43 pk.writeNil();
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44 return;
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45 }
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46 throw new MessageTypeException("Target is not a Map but " + target.getClass());
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47 }
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48 Map<K, V> map = (Map<K, V>) target;
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49 pk.writeMapBegin(map.size());
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50 for (Map.Entry<K, V> pair : map.entrySet()) {
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51 keyTemplate.write(pk, pair.getKey());
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52 valueTemplate.write(pk, pair.getValue());
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53 }
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54 pk.writeMapEnd();
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55 }
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56
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57 public Map<K, V> read(Unpacker u, Map<K, V> to, boolean required)
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58 throws IOException {
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59 if (!required && u.trySkipNil()) {
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60 return null;
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61 }
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62 int n = u.readMapBegin();
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63 Map<K, V> map;
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64 if (to != null) {
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65 map = (Map<K, V>) to;
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66 map.clear();
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67 } else {
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68 map = new HashMap<K, V>(n);
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69 }
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70 for (int i = 0; i < n; i++) {
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71 K key = keyTemplate.read(u, null);
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72 V value = valueTemplate.read(u, null);
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73 map.put(key, value);
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74 }
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75 u.readMapEnd();
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76 return map;
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77 }
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78 }
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