org.dominokit.jackson.deser.EnumJsonDeserializer Maven / Gradle / Ivy
/*
* Copyright 2013 Nicolas Morel
*
* 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.dominokit.jackson.deser;
import org.dominokit.jackson.JsonDeserializationContext;
import org.dominokit.jackson.JsonDeserializer;
import org.dominokit.jackson.JsonDeserializerParameters;
import org.dominokit.jackson.stream.JsonReader;
/**
* Default {@link org.dominokit.jackson.JsonDeserializer} implementation for {@link java.lang.Enum}.
*
* @param Type of the enum
*/
public class EnumJsonDeserializer> extends JsonDeserializer {
/**
* newInstance
*
* @param enumClass class of the enumeration
* @param values {@link E[]}
* @param the enum type
* @return a new instance of {@link org.dominokit.jackson.deser.EnumJsonDeserializer}
*/
public static > EnumJsonDeserializer newInstance(
Class enumClass, E[] values) {
return new EnumJsonDeserializer(enumClass, values);
}
private final Class enumClass;
private final E[] values;
/**
* Constructor for EnumJsonDeserializer.
*
* @param enumClass class of the enumeration
* @param values {@link E[]} enum values
*/
protected EnumJsonDeserializer(Class enumClass, E[] values) {
if (null == enumClass) {
throw new IllegalArgumentException("enumClass cannot be null");
}
this.enumClass = enumClass;
this.values = values;
}
/** {@inheritDoc} */
@Override
public E doDeserialize(
JsonReader reader, JsonDeserializationContext ctx, JsonDeserializerParameters params) {
try {
return getEnum(values, reader.nextString());
} catch (IllegalArgumentException ex) {
if (ctx.isReadUnknownEnumValuesAsNull()) {
return null;
}
throw ex;
}
}
public > E getEnum(E[] values, String name) {
for (int i = 0; i < values.length; i++) {
if (values[i].name().equals(name)) {
return values[i];
}
}
throw new IllegalArgumentException(
"[" + name + "] is not a valid enum constant for Enum type " + getEnumClass().getName());
}
/**
* Getter for the field enumClass.
*
* @return a {@link java.lang.Class} object.
*/
public Class getEnumClass() {
return enumClass;
}
}