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/*-
* ============LICENSE_START==========================================
* ONAP Portal
* ===================================================================
* Copyright © 2017 AT&T Intellectual Property. All rights reserved.
* ===================================================================
*
* Unless otherwise specified, all software contained herein is licensed
* under the Apache License, Version 2.0 (the “License”);
* you may not use this software 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.
*
* Unless otherwise specified, all documentation contained herein is licensed
* under the Creative Commons License, Attribution 4.0 Intl. (the “License”);
* you may not use this documentation except in compliance with the License.
* You may obtain a copy of the License at
*
* https://creativecommons.org/licenses/by/4.0/
*
* Unless required by applicable law or agreed to in writing, documentation
* 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============================================
*
* ECOMP is a trademark and service mark of AT&T Intellectual Property.
*/
package org.openecomp.portalapp.portal.utils;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.HashMap;
import java.util.List;
import org.openecomp.portalsdk.core.logging.logic.EELFLoggerDelegate;
/**
*
* @author Vladimir Turovets This class is used to create HashMap<String, T>
* from the list of T objects. We suppose that
* 1) T object contains field 'parmName' or getter 'getParmName()'.
* The value of object.parmName or object.getParmName() is used as
* a key in created hashMap.
* 2) for all objects in the list 'parmName' or getter
* 'getParmName().toString' has to be unique and not null.
* This class has one function only:
* HashMap<String, T> hashMap(List<T> list, String name) and returns
* hash map created from list.
*
* @param <T>
* Type
*/
public class HashMapFromList<T> {
private EELFLoggerDelegate logger = EELFLoggerDelegate.getLogger(HashMapFromList.class);
public HashMap<String, T> hashMap(List<T> list, String name) {
HashMap<String, T> result = new HashMap<String, T>();
if (list == null || list.size() == 0 || name == null) {
return result;
}
name = name.trim();
if (name.length() > 0) {
T object = list.get(0);
try {
String parmName = name;
Field field = object.getClass().getField(parmName);
for (T obj : list) {
try {
Object o = field.get(obj);
if (o != null)
result.put(o.toString(), obj);
} catch (Exception e1) {
logger.error(EELFLoggerDelegate.errorLogger, "hashMap failed 1: object of class " + object.getClass().getName() + ", field " + parmName, e1);
return new HashMap<String, T>();
}
}
} catch (Exception e) {
String getterName = "get" + (name.length() == 1 ? name.toUpperCase() : (name.substring(0, 1).toUpperCase() + name.substring(1)));
try {
Class<?>[] parmClasses = null;
Method method = object.getClass().getMethod(getterName, parmClasses);
Object[] parmValues = new Object[0];
for (T obj : list) {
try {
Object o = method.invoke(obj, parmValues);
if (o != null)
result.put(o.toString(), obj);
} catch (Exception e2) {
logger.error(EELFLoggerDelegate.errorLogger, "hashMap failed 2: object of class " + object.getClass().getName() + ", method " + getterName, e2);
return new HashMap<String, T>();
}
}
} catch (Exception e3) {
logger.error(EELFLoggerDelegate.errorLogger, "hashMap failed 3: object of class " + object.getClass().getName() + ", bad field '" + name + "' or method '" + getterName + "()", e3);
return new HashMap<String, T>();
}
}
}
if (list.size() != result.size()) {
logger.warn(EELFLoggerDelegate.errorLogger, "Duplicated or empty keys were found!!!");
}
return result;
}
}
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