com.outcastgeek.traversal.TraverseUtils.java Source code

Introduction

Here is the source code for com.outcastgeek.traversal.TraverseUtils.java

Source

package com.outcastgeek.traversal;

/*
 Copyright 2013 outcastgeek
    
 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.
 */

import com.outcastgeek.exceptions.TraverseException;
import org.apache.commons.lang3.ArrayUtils;
import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.lang.reflect.Method;

/**
 * Created with IntelliJ IDEA.
 * User: outcastgeek
 * Date: 8/1/13
 * Time: 11:30 AM
 * To change this template use File | Settings | File Templates.
 */

/**
 * TraverseUtils
 */
public class TraverseUtils {

    private static Logger logger = LoggerFactory.getLogger(TraverseUtils.class);

    /**
     * @param pojo is the POJO to be traversed
     * @param pathSteps is traversal path
     * @return true or false
     * @throws TraverseException
     */
    public static boolean isNullPath(Object pojo, String... pathSteps) throws TraverseException {

        boolean isNullPath = false;

        try {
            Class pojoClass = pojo.getClass();
            Method[] declaredMethods = pojoClass.getDeclaredMethods();
            int pathStepLength = pathSteps.length;
            logger.debug("Traversing {}...", pojo);
            for (int i = 0; i < pathStepLength; i++) {
                String step = pathSteps[i];
                logger.debug("Step: {}", step);
                Object value = null;
                for (Method method : declaredMethods) {
                    String methodName = method.getName();
                    if (StringUtils.containsIgnoreCase(methodName, step)) {
                        value = pojoClass.getDeclaredMethod(methodName).invoke(pojo);
                        break;
                    }
                }
                if (value != null) {
                    if (i == pathStepLength - 1) {
                        break;
                    } else {
                        String[] followingSteps = ArrayUtils.removeElement(pathSteps, step);
                        return isNullPath(value, followingSteps);
                    }
                } else {
                    isNullPath = true;
                    break;
                }
            }
        } catch (Exception e) {
            throw new TraverseException(e);
        }

        return isNullPath;
    }

    /**
     * @param pojo is the POJO to be traversed
     * @param pathSteps is traversal path
     * @return the object a the end of the path
     * @throws TraverseException
     */
    public static Object getPath(Object pojo, String... pathSteps) throws TraverseException {

        Object value = null;

        try {
            Class pojoClass = pojo.getClass();
            Method[] declaredMethods = pojoClass.getDeclaredMethods();
            int pathStepLength = pathSteps.length;
            logger.debug("Traversing {}...", pojo);
            for (int i = 0; i < pathStepLength; i++) {
                String step = pathSteps[i];
                logger.debug("Step: {}", step);
                for (Method method : declaredMethods) {
                    String methodName = method.getName();
                    if (StringUtils.containsIgnoreCase(methodName, step)) {
                        value = pojoClass.getDeclaredMethod(methodName).invoke(pojo);
                        break;
                    }
                }
                if (i == pathStepLength - 1) {
                    break;
                } else {
                    String[] followingSteps = ArrayUtils.removeElement(pathSteps, step);
                    return getPath(value, followingSteps);
                }
            }
        } catch (Exception e) {
            throw new TraverseException(e);
        }

        return value;
    }
}