com.cloudera.nav.plugin.model.ValidationUtil.java Source code

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Here is the source code for com.cloudera.nav.plugin.model.ValidationUtil.java

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/*
 * Copyright (c) 2015 Cloudera, Inc.
 *
 * 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 com.cloudera.nav.plugin.model;

import com.cloudera.nav.plugin.model.annotations.MProperty;
import com.google.common.base.Preconditions;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Collection;

import org.apache.commons.collections.CollectionUtils;
import org.apache.commons.lang.StringUtils;

public class ValidationUtil {

    public void validateRequiredMProperties(Object mPropertyObj) {
        for (Method method : mPropertyObj.getClass().getMethods()) {
            if (!method.isBridge() && method.isAnnotationPresent(MProperty.class)
                    && method.getAnnotation(MProperty.class).required()) {
                Class<?> returnType = method.getReturnType();
                Object value;
                try {
                    value = method.invoke(mPropertyObj);
                } catch (IllegalAccessException e) {
                    throw new IllegalArgumentException("Could not access MProperty method " + method.getName(), e);
                } catch (InvocationTargetException e) {
                    throw new IllegalArgumentException("Could not get MProperty value for " + method.getName(), e);
                }
                if (Collection.class.isAssignableFrom(returnType)) {
                    Preconditions.checkArgument(!CollectionUtils.isEmpty((Collection) value),
                            method.getName() + " returned empty collection");
                } else if (String.class.isAssignableFrom(returnType)) {
                    Preconditions.checkArgument(!StringUtils.isEmpty((String) value),
                            method.getName() + " returned null or empty string");
                } else {
                    Preconditions.checkArgument(value != null, method.getName() + " returned null");
                }
            }
        }
    }
}