Android Open Source - force_analytics_example Store Cursor

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Copyright (c) 2011, salesforce.com, inc. All rights reserved. ======================================== Redistribution and use of this software in source and binary forms, with or without modificatio...

Java Source Code

package com.salesforce.androidsdk.smartstore.phonegap;
/* w  w  w .  ja v a 2  s .c  o  m*/
import org.json.JSONException;
import org.json.JSONObject;

import com.salesforce.androidsdk.smartstore.store.QuerySpec;
import com.salesforce.androidsdk.smartstore.store.SmartStore;

/**
 * Store Cursor 
 * We don't actually keep a cursor opened, instead, we wrap the query spec and page index
 */
public class StoreCursor {
  
  private static int LAST_ID = 0;
  
  // Id / soup / query / totalPages immutable
  public  final int cursorId;
  private final QuerySpec querySpec;
  private final int totalPages;
  
  // Current page can change - by calling moveToPageIndex
  private int currentPageIndex;
  
  /**
   * @param smartStore
   * @param querySpec
   * @throws JSONException 
   */
  public StoreCursor(SmartStore smartStore, QuerySpec querySpec) {
    int countRows = smartStore.countQuery(querySpec);
    
    this.cursorId = LAST_ID++;
    this.querySpec = querySpec;
    this.totalPages = (int) Math.ceil( (double) countRows / querySpec.pageSize);
    this.currentPageIndex = 0;
  }
  
  /**
   * @param newPageIndex
   */
  public void moveToPageIndex(int newPageIndex) {
    // Always between 0 and totalPages-1
    this.currentPageIndex = (newPageIndex < 0 ? 0 : newPageIndex >= totalPages ? totalPages - 1 : newPageIndex);
  }
  
  /**
   * @param smartStore
   * @return json containing cursor meta data (page index, size etc) and data (entries in page)
   * Note: query is run to build json
   * @throws JSONException 
   */
  public JSONObject getData(SmartStore smartStore) throws JSONException {
    JSONObject json = new JSONObject();
    json.put(SmartStorePlugin.CURSOR_ID, cursorId);
    json.put(SmartStorePlugin.CURRENT_PAGE_INDEX, currentPageIndex);
    json.put(SmartStorePlugin.PAGE_SIZE, querySpec.pageSize);
    json.put(SmartStorePlugin.TOTAL_PAGES, totalPages);
    json.put(SmartStorePlugin.CURRENT_PAGE_ORDERED_ENTRIES, smartStore.query(querySpec, currentPageIndex));
    return json;
  }
}

Java Source Code List

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