Android Open Source - Joetz-Android-V2 Json Utils

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License

The source code is released under:

GNU General Public License

Java Source Code

package com.example.jens.myapplication.util;
//ww w .  j  a va2s.c  o  m
import com.example.jens.myapplication.apimanager.JSONParsingTask;
import com.example.jens.myapplication.apimanager.PostRequestTask;
import com.example.jens.myapplication.apimanager.SimpleRequestTask;
import com.example.jens.myapplication.apimanager.manager.LoginManager;
import com.example.jens.myapplication.domain.User;
import com.example.jens.myapplication.sam.JoetzApplication;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.ser.FilterProvider;
import com.fasterxml.jackson.databind.ser.impl.SimpleBeanPropertyFilter;
import com.fasterxml.jackson.databind.ser.impl.SimpleFilterProvider;

import java.io.IOException;
import java.util.Iterator;
import java.util.LinkedList;

/**
 * Created by Sam on 21/11/2014.
 */
public class JsonUtils {
    /**
     * returns a filterprovider with a single filter
     * @param filterName
     * @param fields
     * @return
     */
    public static FilterProvider createSimpleFilter(String filterName, String... fields){
        return new SimpleFilterProvider().addFilter(filterName,
                SimpleBeanPropertyFilter.filterOutAllExcept(fields));
    }

    /**
     * use this to add multiple filters
     * @param filters
     * @return
     */
    public static FilterProvider createSimpleFilter(Filters filters){
        SimpleFilterProvider filter = new SimpleFilterProvider();
        filters.attachFilters(filter);
        return filter;
    }

    /**
     * A class that keeps a list of filters for json object filtering for serialization
     */
    public static class Filters{
        private LinkedList<String> namesList;
        private LinkedList<String[]> fieldsList;

        public Filters(){
            namesList = new LinkedList<String>();
            fieldsList = new LinkedList<String[]>();
        }

        /**
         * Add a filter to the filters
         * @param filterName The name of the filter (corresponds with the JsonFilter(value) value)
         * @param fields The fields that should be included
         * @return
         */
        public Filters addFilter(String filterName, String... fields){
            this.namesList.add(filterName);
            this.fieldsList.add(fields);
            return this;
        }

        /**
         * Attach the filters to the filterprovider
         * @param filterProvider the provider to which the filters should be added
         */
        public void attachFilters(SimpleFilterProvider filterProvider){
            Iterator<String> itNames = namesList.iterator();
            Iterator<String[]> itFields = fieldsList.iterator();

            while(itNames.hasNext()){
                String filterName = itNames.next();
                String[] fields = itFields.next();
                filterProvider.addFilter(filterName, SimpleBeanPropertyFilter.filterOutAllExcept(fields));
            }
        }
    }

    /**
     *
     * @return a task that maps the json string to a user object
     */
    public static JSONParsingTask<User> createSimpleUserTask(){
        return new JSONParsingTask<User>() {
            @Override
            public User handleJSON(String json) throws IOException {
                return new ObjectMapper().readValue(json, User.class);
            }
        };
    }

    /**
     * Creates a task that will set the new user as the currently logged in user
     * @param afterTask The task that should be called after this object's task is completed
     *                  (can be null)
     * @return the task
     */
    public static PostRequestTask<User> createSimpleRefreshUserTask(final SimpleRequestTask afterTask){
        return new PostRequestTask<User>() {
            @Override
            public void doTask(User user, int statusCode) {
                LoginManager manager = JoetzApplication.getContext().getLoginManager();
                if(!manager.isLoggedIn()) {
                    throw new IllegalArgumentException("User has to be logged in to refresh");
                }
                manager.setUser(user);
                if(afterTask != null){
                    afterTask.doTask(statusCode);
                }
            }
        };
    }

    /**
     * Creates a simple task that only executes the afterTask if it is not null
     * @param afterTask The task to be executed
     * @return the task
     */
    public static PostRequestTask createSimpleDoAfterTask(final SimpleRequestTask afterTask){
        return new PostRequestTask() {
            @Override
            public void doTask(Object obj, int statusCode) {
                if(afterTask != null){
                    afterTask.doTask(statusCode);
                }
            }
        };
    }
}

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