org.teamapps.data.extract.BeanPropertyExtractor Maven / Gradle / Ivy
/*-
* ========================LICENSE_START=================================
* TeamApps
* ---
* Copyright (C) 2014 - 2023 TeamApps.org
* ---
* 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.
* =========================LICENSE_END==================================
*/
package org.teamapps.data.extract;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.teamapps.util.ReflectionUtil;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
public class BeanPropertyExtractor implements PropertyExtractor {
private static final Logger LOGGER = LoggerFactory.getLogger(BeanPropertyExtractor.class);
private static final Map valueExtractorsByClassAndPropertyName = new ConcurrentHashMap<>();
private final Map> customExtractors = new HashMap<>(0);
private final boolean fallbackToFields;
public BeanPropertyExtractor() {
this(false);
}
public BeanPropertyExtractor(boolean fallbackToFields) {
this.fallbackToFields = fallbackToFields;
}
@Override
public Object getValue(RECORD record, String propertyName) {
ValueExtractor valueExtractor = getValueExtractor(record.getClass(), propertyName);
return valueExtractor.extract(record);
}
protected ValueExtractor getValueExtractor(Class clazz, String propertyName) {
ValueExtractor valueExtractor = customExtractors.get(propertyName);
if (valueExtractor != null) {
return valueExtractor;
} else {
return valueExtractorsByClassAndPropertyName.computeIfAbsent(
new ClassAndPropertyName(clazz, propertyName, fallbackToFields),
classAndPropertyName -> createValueExtractor(classAndPropertyName)
);
}
}
private ValueExtractor createValueExtractor(ClassAndPropertyName classAndPropertyName) {
Method getter = ReflectionUtil.findGetter(classAndPropertyName.clazz, classAndPropertyName.propertyName);
Method recordGetter = ReflectionUtil.findMethodByName(classAndPropertyName.clazz, classAndPropertyName.propertyName);
if (getter != null) {
return record -> ReflectionUtil.invokeMethod(record, getter);
} else if (recordGetter != null) {
return record -> ReflectionUtil.invokeMethod(record, recordGetter);
} else if (fallbackToFields) {
Field field = ReflectionUtil.findField(classAndPropertyName.clazz, classAndPropertyName.propertyName);
if (field != null) {
return record -> ReflectionUtil.readField(record, field, true);
}
}
LOGGER.debug("Could not find getter " + (fallbackToFields ? "or field " : "") + "for property {} on class {}!", classAndPropertyName.propertyName, classAndPropertyName.getClass().getCanonicalName());
return record -> null;
}
public BeanPropertyExtractor addProperty(String propertyName, ValueExtractor valueExtractor) {
this.customExtractors.put(propertyName, valueExtractor);
return this;
}
}