/*
* Copyright 2016 Martin Kouba
*
* 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.trimou.jsonp.converter;
import java.util.Collections;
import java.util.Set;
import javax.json.JsonString;
import javax.json.JsonValue;
import org.trimou.engine.config.Configuration;
import org.trimou.engine.config.ConfigurationKey;
import org.trimou.engine.config.SimpleConfigurationKey;
import org.trimou.engine.convert.AbstractValueConverter;
import org.trimou.util.Strings;
/**
* Converts {@link JsonString} and {@link JsonValue#NULL}.
*
* @author Martin Kouba
*/
public class JsonProcessingValueConverter extends AbstractValueConverter {
public static final ConfigurationKey ENABLED_KEY = new SimpleConfigurationKey(
JsonProcessingValueConverter.class.getName() + ".enabled", true);
public JsonProcessingValueConverter() {
super();
}
public JsonProcessingValueConverter(int priority) {
super(priority);
}
@Override
public String convert(Object value) {
if (value instanceof JsonString) {
return ((JsonString) value).getString();
} else if (JsonValue.NULL.equals(value)) {
return Strings.EMPTY;
}
return null;
}
@Override
public void init(Configuration configuration) {
isEnabled = configuration.getBooleanPropertyValue(ENABLED_KEY);
}
@Override
public Set<ConfigurationKey> getConfigurationKeys() {
return Collections.singleton(ENABLED_KEY);
}
}