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/**
 * Copyright (C) 2016 Red Hat, Inc.
 *
 * 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 io.syndesis.core.json;

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.JsonDeserializer;

/**
 * Trims JSON strings and converts any empty strings to {@code null}.
 */
class StringTrimmingJsonDeserializer extends JsonDeserializer {

    @Override
    public String deserialize(final JsonParser parser, final DeserializationContext ctxt)
        throws IOException, JsonProcessingException {
        final boolean hasStringValue = parser.hasToken(JsonToken.VALUE_STRING);

        if (!hasStringValue) {
            return null;
        }

        final String text = parser.getText();

        final String trimmed = text.trim();

        if (trimmed.isEmpty()) {
            return null;
        }

        return trimmed;
    }

}