org.molasdin.wbase.ReflectionHelper.java Source code

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Here is the source code for org.molasdin.wbase.ReflectionHelper.java

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/*
 * Copyright 2013 Bersenev Dmitry molasdin@outlook.com
 *
 * 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.molasdin.wbase;

import org.apache.commons.beanutils.BeanUtils;
import org.apache.commons.beanutils.MethodUtils;
import org.apache.commons.beanutils.PropertyUtils;

import java.util.*;

public class ReflectionHelper {
    /**
     * Extracts all properties from the bean
     * @param bean
     * @return
     */
    @SuppressWarnings("unchecked")
    private static Map<String, Object> extractAll(Object bean) {
        Map<String, Object> description = Collections.emptyMap();
        try {
            description = PropertyUtils.describe(bean);
            description.remove("class");
        } catch (Exception ex) {
            throw new RuntimeException(ex);
        }
        return description;
    }

    /**
     * Extracts only not null properties
     * @param bean
     * @return
     */
    public static Map<String, Object> extractNotNullProperties(Object bean) {
        Map<String, Object> result = new HashMap<String, Object>();
        Map<String, Object> descr = extractAll(bean);
        for (String prop : descr.keySet()) {
            if (descr.get(prop) != null) {
                result.put(prop, descr.get(prop));
            }
        }
        return result;
    }

    /**
     * Determines if all properties are null and collections are empty
     * @param bean
     * @return
     */
    public static boolean isEmpty(Object bean) {
        Map<String, Object> descr = extractAll(bean);
        for (String prop : descr.keySet()) {
            Object o = descr.get(prop);
            if (o != null) {
                if (o instanceof Collection) {
                    if (((Collection) o).isEmpty()) {
                        continue;
                    }
                }
                return false;
            }
        }
        return true;
    }

    @SuppressWarnings("unchecked")
    public static boolean hasFunction(String name, Object object) {
        Class clazz = object.getClass();
        try {
            clazz.getDeclaredMethod(name);
        } catch (Exception ex) {
            return false;
        }
        return true;
    }

    public static Object functionValue(String name, Object object) {
        try {
            return MethodUtils.invokeExactMethod(object, name, new Object[0]);
        } catch (Exception ex) {
            throw new RuntimeException(ex);
        }
    }

    public static boolean supportsNaturalOrdering(Object object) {
        return object instanceof Comparable;
    }

    public static boolean isNumeric(Object value) {
        return value instanceof Number;
    }
}