org.springframework.social.google.api.impl.ApiEnumDeserializer Maven / Gradle / Ivy

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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  enum type
 */
public abstract class ApiEnumDeserializer> extends JsonDeserializer {

	private final Class type;
	
	public ApiEnumDeserializer(Class 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;
	}

}