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Various spring support classes
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/*
 * Copyright 2016 Bystrobank
 *
 * 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 ru.ilb.common.utils;

import java.util.HashSet;
import java.util.List;
import java.util.Set;
import org.springframework.beans.BeanWrapper;
import org.springframework.beans.BeanWrapperImpl;

/**
 *
 * @author slavb
 */
public class BeanTool {

    public static String[] getNullPropertyNames (Object source) {
        final BeanWrapper src = new BeanWrapperImpl(source);
        java.beans.PropertyDescriptor[] pds = src.getPropertyDescriptors();

        Set emptyNames = new HashSet();
        for(java.beans.PropertyDescriptor pd : pds) {
            Object srcValue = src.getPropertyValue(pd.getName());
            if (srcValue == null) {
                emptyNames.add(pd.getName());
            } else if (srcValue instanceof List) {
                if (((List) srcValue).isEmpty()) {
                    emptyNames.add(pd.getName());
                }
            }
        }
        String[] result = new String[emptyNames.size()];
        return emptyNames.toArray(result);
    }
    
    public static String[] getNotNullPropertyNames(Object source) {
        final BeanWrapper src = new BeanWrapperImpl(source);
        java.beans.PropertyDescriptor[] pds = src.getPropertyDescriptors();

        Set emptyNames = new HashSet();
        for (java.beans.PropertyDescriptor pd : pds) {
            Object srcValue = src.getPropertyValue(pd.getName());
            boolean isNull = false;
            if (srcValue == null) {
                isNull = true;
            } else if (srcValue instanceof List) {
                if (((List) srcValue).isEmpty()) {
                    isNull = true;
                }
            }
            if (!isNull) {
                emptyNames.add(pd.getName());
            }
        }
        String[] result = new String[emptyNames.size()];
        return emptyNames.toArray(result);
    }

}