1 | package testcode;
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2 |
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3 | import static org.junit.Assert.assertEquals;
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4 |
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5 | import java.io.IOException;
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6 | import java.util.Objects;
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7 |
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8 | import com.fasterxml.jackson.core.JsonParser;
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9 | import com.fasterxml.jackson.core.JsonProcessingException;
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10 | import com.fasterxml.jackson.databind.DeserializationContext;
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11 | import com.fasterxml.jackson.databind.ObjectMapper;
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12 | import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
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13 | import com.fasterxml.jackson.databind.deser.std.StdDeserializer;
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14 |
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15 | @JsonDeserialize(using = ValueDeserializer.class)
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16 | public class Value {
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17 | private final Object value;
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18 |
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19 | public Value(Object value) {
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20 | this.value = value;
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21 | }
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22 |
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23 | public Object getValue() {
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24 | return value;
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25 | }
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26 |
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27 | /** The test code for Value */
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28 | public static void main(String[] args) throws JsonProcessingException {
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29 | ObjectMapper jackson = new ObjectMapper();
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30 | Value val = new Value((float) 12);
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31 | System.out.println(jackson.writeValueAsString(val));
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32 | assertEquals(val, jackson.readValue("12", Value.class));
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33 | val = new Value("hallo");
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34 | System.out.println(jackson.writeValueAsString(val));
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35 | assertEquals(val, jackson.readValue("\"hallo\"", Value.class));
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36 | }
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37 |
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38 | @Override
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39 | public int hashCode() {
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40 | return Objects.hash(value);
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41 | }
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42 |
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43 | @Override
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44 | public boolean equals(Object obj) {
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45 | if (this == obj)
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46 | return true;
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47 | if (obj == null)
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48 | return false;
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49 | if (getClass() != obj.getClass())
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50 | return false;
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51 | Value other = (Value) obj;
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52 | return Objects.equals(value, other.value);
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53 | }
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54 |
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55 | @Override
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56 | public String toString() {
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57 | return "val:" + value;
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58 | }
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59 | }
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60 |
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61 | class ValueDeserializer extends StdDeserializer<Value> {
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62 | public ValueDeserializer() {
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63 | this(null);
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64 | }
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65 |
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66 | public ValueDeserializer(Class<?> vc) {
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67 | super(vc);
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68 | }
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69 |
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70 | @Override
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71 | public Value deserialize(JsonParser jp, DeserializationContext ctxt)
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72 | throws IOException, JsonProcessingException {
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73 | String text = jp.getText();
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74 | switch (jp.currentToken()) {
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75 | case VALUE_NUMBER_FLOAT:
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76 | case VALUE_NUMBER_INT:
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77 | return new Value(Float.parseFloat(text));
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78 | case VALUE_STRING:
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79 | return new Value(text);
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80 | default:
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81 | throw new IOException(
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82 | "Expected number of double quoted string but found " + text
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83 | + " of type " + jp.currentToken());
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84 | }
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85 |
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86 | }
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87 |
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88 | }
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