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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.Collection;
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22 import java.util.LinkedList;
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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 CollectionTemplate<E> extends AbstractTemplate<Collection<E>> {
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28 private Template<E> elementTemplate;
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29
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30 public CollectionTemplate(Template<E> elementTemplate) {
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31 this.elementTemplate = elementTemplate;
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32 }
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33
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34 public void write(Packer pk, Collection<E> target, boolean required)
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35 throws IOException {
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36 if (target == null) {
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37 if (required) {
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38 throw new MessageTypeException("Attempted to write null");
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39 }
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40 pk.writeNil();
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41 return;
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42 }
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43 Collection<E> col = target;
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44 pk.writeArrayBegin(col.size());
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45 for (E e : col) {
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46 elementTemplate.write(pk, e);
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47 }
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48 pk.writeArrayEnd();
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49 }
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50
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51 public Collection<E> read(Unpacker u, Collection<E> to, boolean required)
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52 throws IOException {
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53 if (!required && u.trySkipNil()) {
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54 return null;
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55 }
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56 int n = u.readArrayBegin();
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57 if (to == null) {
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58 to = new LinkedList<E>();
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59 } else {
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60 to.clear();
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61 }
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62 for (int i = 0; i < n; i++) {
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63 E e = elementTemplate.read(u, null);
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64 to.add(e);
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65 }
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66 u.readArrayEnd();
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67 return to;
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68 }
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69 }
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