Example usage for com.fasterxml.jackson.core ObjectCodec treeToValue

Introduction

In this page you can find the example usage for com.fasterxml.jackson.core ObjectCodec treeToValue.

Prototype

public abstract <T> T treeToValue(TreeNode n, Class<T> valueType) throws JsonProcessingException;

Source Link

Document

Convenience method for converting given JSON tree into instance of specified value type.

Usage

From source file:com.evrythng.java.wrapper.mapping.TypeMapDeserializer.java

@Override
public T deserialize(final JsonParser jp, final DeserializationContext ctxt) throws IOException {

    ObjectCodec codec = jp.getCodec();
    ObjectMapper mapper = (ObjectMapper) codec;
    ObjectNode root = mapper.readTree(jp);
    JsonNode type = root.get(typeFieldName);
    final String sType = type == null ? null : type.textValue();

    Class<? extends T> clazz = resolveClass(sType);

    return codec.treeToValue(root, clazz);
}

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From source file:org.apache.unomi.persistence.spi.ItemDeserializer.java

@Override
public Item deserialize(JsonParser jp, DeserializationContext ctxt) throws IOException {
    ObjectCodec codec = jp.getCodec();
    ObjectNode treeNode = codec.readTree(jp);
    String type = treeNode.get("itemType").textValue();
    Class<? extends Item> objectClass = classes.get(type);
    if (objectClass == null) {
        objectClass = CustomItem.class;
    } else {//from  w ww  . j  a  va2 s.com
        treeNode.remove("itemType");
    }
    Item item = codec.treeToValue(treeNode, objectClass);
    item.setItemId(treeNode.get("itemId").asText());
    return item;
}

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From source file:com.evrythng.java.wrapper.mapping.ActionDeserializerImpl.java

@Override
public Action deserialize(final JsonParser jp, final DeserializationContext ctxt) throws IOException {

    ObjectCodec codec = jp.getCodec();
    ObjectMapper mapper = (ObjectMapper) codec;
    ObjectNode root = mapper.readTree(jp);
    JsonNode type = root.get(getTypeFieldName());
    if (type == null) {
        throw new IllegalArgumentException(this.getValueClass().getSimpleName() + " type cannot be empty.");
    }//  ww  w. j  a v  a  2s  . c o m
    String sType = type.textValue();
    if (sType == null || sType.isEmpty()) {
        throw new IllegalArgumentException(this.getValueClass().getSimpleName() + " type cannot be empty.");
    }

    return codec.treeToValue(root, resolveClass(sType));
}

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From source file:com.evrythng.java.wrapper.mapping.GeoJsonDeserializerImpl.java

@Override
public GeoJson deserialize(JsonParser jp, DeserializationContext ctxt)
        throws IOException, JsonProcessingException {
    ObjectCodec codec = jp.getCodec();
    ObjectMapper mapper = (ObjectMapper) codec;
    ObjectNode root = (ObjectNode) mapper.readTree(jp);
    JsonNode type = root.get(getTypeFieldName());
    if (type == null) {
        throw new IllegalArgumentException(this.getValueClass().getSimpleName() + " type cannot be empty.");
    }/*w w  w  . j av a 2s  .c om*/
    String sType = type.textValue();
    if (sType == null || sType.isEmpty()) {
        throw new IllegalArgumentException(this.getValueClass().getSimpleName() + " type cannot be empty.");
    }

    Class<GeoJson> clazz = (Class<GeoJson>) resolveClass(sType);

    GeoJson obj = codec.treeToValue(root, clazz);
    if (obj == null) {
        throw new IllegalArgumentException(
                this.getValueClass().getSimpleName() + " type deserialised as null: " + root.toString());
    }
    return obj;
}

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From source file:org.apache.unomi.persistence.spi.PropertyTypedObjectDeserializer.java

@Override
public Object deserialize(JsonParser jp, DeserializationContext ctxt) throws IOException {
    if (jp.getCurrentTokenId() != JsonTokenId.ID_START_OBJECT) {
        return super.deserialize(jp, ctxt);
    }/*from  www.j a v  a2s . co  m*/
    ObjectCodec codec = jp.getCodec();
    TreeNode treeNode = codec.readTree(jp);
    Class<? extends Object> objectClass = null;
    if (treeNode instanceof ObjectNode) {
        ObjectNode root = (ObjectNode) treeNode;
        Iterator<Map.Entry<String, JsonNode>> elementsIterator = root.fields();
        while (elementsIterator.hasNext()) {
            Map.Entry<String, JsonNode> element = elementsIterator.next();
            String name = element.getKey();
            if (fieldValuesToMatch.containsKey(name)) {
                Set<String> valuesToMatch = fieldValuesToMatch.get(name);
                for (String valueToMatch : valuesToMatch) {
                    if (element.getValue().asText().matches(valueToMatch)) {
                        objectClass = registry.get(name + "=" + valueToMatch);
                        break;
                    }
                }
                if (objectClass != null) {
                    break;
                }
            }
        }
        if (objectClass == null) {
            objectClass = HashMap.class;
        }
    } else {

    }
    if (objectClass == null) {
        return super.deserialize(codec.treeAsTokens(treeNode), ctxt);
    }
    return codec.treeToValue(treeNode, objectClass);
}

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