org.springframework.social.google.api.impl.ApiEnumDeserializer Maven / Gradle / Ivy
/**
* Copyright 2011-2017 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.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(final Class type) {
this.type = type;
}
@Override
public T deserialize(final JsonParser jp, final DeserializationContext ctxt)
throws IOException {
final String camelCase = jp.getText();
final StringBuilder sb = new StringBuilder();
for (int i = 0; i < camelCase.length(); i++) {
final char c = camelCase.charAt(i);
if (Character.isUpperCase(c)) {
sb.append('_').append(c);
} else {
sb.append(Character.toUpperCase(c));
}
}
@SuppressWarnings({"rawtypes", "unchecked"}) final T value = (T) Enum.valueOf((Class) type, sb.toString());
return value;
}
}