org.springframework.social.google.api.impl.ApiEnumDeserializer.java Source code

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Here is the source code for org.springframework.social.google.api.impl.ApiEnumDeserializer.java

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/*
 * Copyright 2011 the original author or authors.
 *
 * 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 org.springframework.social.google.api.impl;

import java.io.IOException;

import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonDeserializer;

/**
 * Jackson {@link JsonDeserializer} that converts a camel case string to 
 * capital underscored string and finds the enum value with that name.
 * @author Gabriel Axel
 *
 * @param <T> enum type
 */
public abstract class ApiEnumDeserializer<T extends Enum<?>> extends JsonDeserializer<T> {

    private final Class<T> type;

    public ApiEnumDeserializer(Class<T> type) {
        this.type = type;
    }

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

        String camelCase = jp.getText();

        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < camelCase.length(); i++) {
            char c = camelCase.charAt(i);
            if (Character.isUpperCase(c)) {
                sb.append('_').append(c);
            } else {
                sb.append(Character.toUpperCase(c));
            }
        }

        @SuppressWarnings({ "rawtypes", "unchecked" })
        T value = (T) Enum.valueOf((Class) type, sb.toString());

        return value;
    }

}