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At first glance, the retrievePrices(currentSymbol) method (listing 6.6) looks a lot like the storePrice() method from the ObtainQuoteMIDlet. In fact, they both use the same record enumeration and record filter to locate a record. However this time, instead of updating or adding the record, the retrievePrices() method simply extracts the current and historical dollar prices from any matching record found. This method serves as the implementation of the RetrievePrice use case in our tutorial application design.
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Listing 6.6 RetrieveQuoteMIDlet s retrievePrices method
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private int[] retrievePrices(String symbol) { int[] dollars = null;
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try { RecordStore anRMS = RecordStore.openRecordStore("Quotes" , true); RecordFilter rf = new QuoteFilter(symbol); RecordEnumeration rEnum = anRMS.enumerateRecords(rf,null,false); if (rEnum.hasNextElement()) { byte[] rec = rEnum.nextRecord(); dollars = parsePrices(rec); } else dollars = null; rEnum.destroy(); anRMS.closeRecordStore(); } catch (RecordStoreFullException fullStore) { //handle a full record store problem } catch (RecordStoreNotFoundException notFoundException) { //handle store not found which should not happen with the //createIfNecessary tag set to true } catch (RecordStoreException recordStoreException) { //handling record store problems } return dollars;
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Open the Quotes record store Parse out the current and historical prices from the record. Return null signifying no prices and no record Return array containing the prices Extracting the dollar prices from a record is again a matter of string manipulation and character matching. It is handled by the parsePrices(byte[] quoteRec) method which is shown in listing 6.7.
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PERSISTENT STORAGE IN THE INVESTMENT QUOTE APPLICATION
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Listing 6.7 The parsePrices method in ObtainQuoteMIDlet and RetrieveQuoteMIDlet
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private int[] parsePrices(byte[] quoteRec) { String rec = new String(quoteRec); int dollar1Pos = rec.indexOf(';'); int cent1Pos = rec.indexOf(';',dollar1Pos+1); int dollar2Pos = rec.indexOf(';',cent1Pos + 1); if (dollar2Pos > 0) { //had a historical price int cent2Pos = rec.indexOf(';',dollar2Pos + 1); int currentDollars = Integer.parseInt(rec.substring(dollar1Pos + 1, cent1Pos)); int currentCents = Integer.parseInt(rec.substring(cent1Pos + 1, dollar2Pos)); int historicalDollars = Integer.parseInt(rec.substring(dollar2Pos + 1, cent2Pos)); int historicalCents = Integer.parseInt(rec.substring(cent2Pos + 1)); int[] returnPrices = {currentDollars, currentCents, historicalDollars, historicalCents}; return returnPrices; } else { //no previous historical price int currentDollars = Integer.parseInt(rec.substring(dollar1Pos + 1, cent1Pos)); int currentCents = Integer.parseInt(rec.substring(cent1Pos + 1)); int[] returnPrices = {currentDollars, currentCents}; return returnPrices; } }
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Each record contains the symbol for the investment and up to two sets of integers for the dollars and cents of each price quote (current and possibly historical price). The current and historical prices are extracted from the record and returned in an integer array. If the investment has only one price stored for it, then the array returned contains two integers; the dollar and cents of the currently known price for the investment. If a historical price is also known for the investment, the integer array will have four numbers representing the current dollars and cents price as well as the historical dollars and cents price respectively. Retrofitting the canvas display The RetrieveQuoteMIDlet and its canvas display object currently only depict the dollar value portion of the investment prices. So after the prices are retrieved, the array is checked for two (indicating only a current investment price is available) or four integers have been obtained from the record store. While the retrievePrices() method returns dollars and cents, the size of the graphical user interface is limited and so only the dollar parts of the price are depicted in the comparison bar charts. Both current and historical dollar prices are required in order to display the
MIDP DATA STORAGE
graphical bar chart showing the price changes. With only a current price and no historical price available, the user is given the current price via an informational alert window. This is also true if no record for the requested symbol exists in the record store. The retrievePrices() method would have returned null. In this case, an alert is used to inform the user that no data exists for the symbol provided. The updated displayChartCanvas()method, shown in listing 6.8, performs the check for available price information and calls to display the appropriate information to the customer.
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