com.addthis.bundle.value.ValueDeserializer.java Source code

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Here is the source code for com.addthis.bundle.value.ValueDeserializer.java

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/*
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.addthis.bundle.value;

import java.io.IOException;

import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.core.JsonToken;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.deser.std.StdDeserializer;
import com.fasterxml.jackson.databind.node.ObjectNode;

public class ValueDeserializer extends StdDeserializer<ValueObject> {

    public ValueDeserializer() {
        super(ValueObject.class);
    }

    @Override
    public ValueObject deserialize(JsonParser jp, DeserializationContext ctxt)
            throws IOException, JsonProcessingException {
        JsonToken t = jp.getCurrentToken();
        switch (t) {
        case VALUE_TRUE:
        case VALUE_FALSE:
        case VALUE_STRING:
            return jp.readValueAs(ValueString.class);
        case VALUE_NUMBER_INT:
            return jp.readValueAs(ValueLong.class);
        case VALUE_NUMBER_FLOAT:
            return jp.readValueAs(ValueDouble.class);
        case START_ARRAY:
            return jp.readValueAs(ValueArray.class);
        case START_OBJECT:
        case FIELD_NAME:
            return jp.readValueAs(ValueMap.class);
        case END_OBJECT:
            // calling jp.readValueAs here will return null rather than an empty map, so make empty map in tokens
            jp.nextToken();
            ObjectNode objectNode = ctxt.getNodeFactory().objectNode();
            JsonParser emptyObjectParser = jp.getCodec().treeAsTokens(objectNode);
            emptyObjectParser.nextToken();
            return emptyObjectParser.readValueAs(ValueMap.class);
        case VALUE_EMBEDDED_OBJECT:
        default:
            throw ctxt.mappingException(handledType());
        }
    }
}