com.github.tarsys.android.orm.dataobjects.JSONDataSource.java Source code

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Here is the source code for com.github.tarsys.android.orm.dataobjects.JSONDataSource.java

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/*
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 * and open the template in the editor.
 */

package com.github.tarsys.android.orm.dataobjects;

import com.google.gson.JsonArray;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonParser;
import com.google.gson.JsonSyntaxException;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.Map;

/**
 *
 * @author TaRSyS
 */
public class JSONDataSource implements Serializable, Iterable<JsonObject> {
    //<editor-fold defaultstate="collapsed" desc="Variables privadas a la clase">

    private final ArrayList<String> columns = new ArrayList<String>();
    private String jsonData = "";
    //</editor-fold>

    //<editor-fold defaultstate="collapsed" desc="Mtodos pblicos de la clase">

    /**
     * Obtiene las columns del origen de dataRows
     * @return
     */
    public ArrayList<String> getColumns() {
        return columns;
    }

    /**
     * Obtiene el nmero de elementos del origen de dataRows
     * @return
     */
    public int size() {

        return this.getData().size();
    }

    /**
     * Obtiene el objeto JsonArray asociado al origen de dataRows
     * @return
     */
    public JsonArray getData() {
        JsonArray datos = new JsonArray();
        try {
            if (!this.jsonData.isEmpty())
                datos = new JsonParser().parse(this.jsonData).getAsJsonArray();
        } catch (JsonSyntaxException ex) {

        }
        return datos;
    }

    public void addDataObject(JsonObject item) {
        JsonArray datos = this.getData();

        if (this.columns.isEmpty()) {
            if (item != null) {
                for (Map.Entry<String, JsonElement> e : item.entrySet())
                    this.columns.add(e.getKey());
            }
        }
        datos.add(item);

        this.jsonData = datos.toString();
    }

    //</editor-fold>

    //<editor-fold defaultstate="collapsed" desc="Constructores de la clase">

    public JSONDataSource() {

    }

    public JSONDataSource(JsonArray jArray) {
        if (jArray != null && jArray.size() > 0) {
            // cogemos el primer objeto del array, para sacarle sus claves...
            try {
                JsonObject obj = jArray.get(0).getAsJsonObject();
                if (obj != null) {
                    for (Map.Entry<String, JsonElement> e : obj.entrySet())
                        this.columns.add(e.getKey());
                }
                this.jsonData = jArray.toString();
            } catch (Exception ex) {
            }
        }
    }

    //</editor-fold>

    //<editor-fold defaultstate="collapsed" desc="Mtodos de la interfaz Iterable<JsonObject>">

    public Iterator<JsonObject> iterator() {
        Iterator<JsonObject> it = new Iterator<JsonObject>() {
            private final JsonArray dataRows = JSONDataSource.this.getData();

            private int currentIndex = 0;

            @Override
            public boolean hasNext() {
                return currentIndex < this.dataRows.size() && this.dataRows.get(currentIndex) != null;
            }

            @Override
            public JsonObject next() {
                return this.dataRows.get(currentIndex++).getAsJsonObject();
            }

            @Override
            public void remove() {
                // TODO Auto-generated method stub
            }
        };
        return it;
    }

    //</editor-fold>
}