alpine.json.TrimmedStringDeserializer.java Source code

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Here is the source code for alpine.json.TrimmedStringDeserializer.java

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/*
 * This file is part of Alpine.
 *
 * 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.
 *
 * Copyright (c) Steve Springett. All Rights Reserved.
 */
package alpine.json;

import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonDeserializer;
import com.fasterxml.jackson.databind.JsonNode;
import org.apache.commons.lang3.StringUtils;
import java.io.IOException;

/**
 * This custom deserializer ensures that empty strings are deserialized as null rather than an "".
 *
 * Usage example:
 * <pre>
 * {@literal @}JsonDeserialize(using = TrimmedStringDeserializer.class)
 * String name;
 * </pre>
 *
 * @author Steve Springett
 * @since 1.0.0
 */
public class TrimmedStringDeserializer extends JsonDeserializer<String> {

    @Override
    public String deserialize(JsonParser jsonParser, DeserializationContext context) throws IOException {
        final JsonNode node = jsonParser.readValueAsTree();
        return StringUtils.trimToNull(node.asText());
    }

}