Java tutorial
/* This file is part of jTotus. jTotus is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. jTotus is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with jTotus. If not, see <http://www.gnu.org/licenses/>. * * * * An example of fetcher. */ package org.jtotus.database; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.math.BigDecimal; import java.util.HashMap; import org.apache.http.HttpEntity; import org.apache.http.HttpResponse; import org.apache.http.StatusLine; import org.apache.http.client.methods.HttpGet; import org.apache.http.impl.client.DefaultHttpClient; import org.joda.time.DateTime; import org.joda.time.format.DateTimeFormat; import org.joda.time.format.DateTimeFormatter; import org.jtotus.common.StockNames; /** * * @author Evgeni Kappinen */ public class NetworkGoogle implements InterfaceDataBase { private static final String url = "http://www.google.com/finance/historical"; private static final String timePatternForWrite = "MMMM+d'%2C'+Y"; private static final String timePatternForRead = "dd-MMMM-yy"; private static final StockNames names = new StockNames(); private static final DateTimeFormatter formatter = DateTimeFormat.forPattern("dd-MM-yyyy"); private static final int dateInd = 0; private static final int openInd = 1; private static final int highInd = 2; private static final int lowhInd = 3; private static final int closehInd = 4; private static final int volumeInd = 5; public NetworkGoogle() { // BasicConfigurator.configure(); } public BigDecimal fetchClosingPrice(String stockName, DateTime calendar) { throw new UnsupportedOperationException("Not supported yet."); } public BigDecimal fetchAveragePrice(String stockName, DateTime time) { throw new UnsupportedOperationException("Not supported yet."); } public BigDecimal fetchVolume(String stockName, DateTime date) { throw new UnsupportedOperationException("Not supported yet."); } public void storeClosingPrice(String stockName, DateTime date, BigDecimal value) { throw new UnsupportedOperationException("Not supported yet."); } public void storeVolume(String stockName, DateTime date, BigDecimal value) { throw new UnsupportedOperationException("Not supported yet."); } public HashMap<String, Double> fetchPeriodAsMap(String stockName, DateTime startDate, DateTime endDate) { HashMap<String, Double> retMap = new HashMap<String, Double>(500); DefaultHttpClient client = new DefaultHttpClient(); HttpGet httpGet = null; try { DateTimeFormatter formatterOUT = DateTimeFormat.forPattern(timePatternForWrite); DateTimeFormatter formatterIN = DateTimeFormat.forPattern(timePatternForRead); String query = url + "?q=" + names.getHexName(stockName) + "&" + "startdate=" + formatterOUT.print(startDate) + "&" + "enddate=" + formatterOUT.print(endDate) + "&" + "&num=30&output=csv"; System.out.printf("HttpGet:%s : date:%s\n", query, formatterOUT.print(startDate)); httpGet = new HttpGet(query); HttpResponse response = client.execute(httpGet); StatusLine status = response.getStatusLine(); if (status.getStatusCode() != 200) { throw new IOException("Invalid response from server: " + status.toString()); } HttpEntity entity = response.getEntity(); BufferedReader reader = new BufferedReader(new InputStreamReader(entity.getContent())); // Date, Open,High,Low,Close,Volume String line = reader.readLine(); //Header while ((line = reader.readLine()) != null) { String[] values = line.split(","); DateTime date = formatterIN.parseDateTime(values[0]); double value = Double.parseDouble(values[4]); retMap.put(formatter.print(date), value); } } catch (IOException ex) { System.err.printf("Unable to find market data for: %s - %s\n", names.getHexName(stockName), stockName); } catch (IllegalArgumentException ex) { System.err.printf("Unable to find market data for: %s - %s\n", names.getHexName(stockName), stockName); } finally { if (httpGet != null) { } } System.out.printf("NetworkGoogle fetched : %d values\n", retMap.size()); return retMap; } public BigDecimal fetchDataInternal(String stockName, DateTime endDate, int type) { DefaultHttpClient client = new DefaultHttpClient(); HttpGet httpGet = null; DateTime startDate = endDate.minusDays(5); BigDecimal retValue = null; try { DateTimeFormatter formatterOUT = DateTimeFormat.forPattern(timePatternForWrite); DateTimeFormatter formatterIN = DateTimeFormat.forPattern(timePatternForRead); String query = url + "?q=" + names.getHexName(stockName) + "&" + "startdate=" + formatterOUT.print(startDate) + "&" + "enddate=" + formatterOUT.print(endDate) + "&" + "&num=30&output=csv"; System.out.printf("HttpGet:%s : date:%s\n", query, formatterOUT.print(startDate)); httpGet = new HttpGet(query); HttpResponse response = client.execute(httpGet); StatusLine status = response.getStatusLine(); if (status.getStatusCode() != 200) { throw new IOException("Invalid response from server: " + status.toString()); } HttpEntity entity = response.getEntity(); BufferedReader reader = new BufferedReader(new InputStreamReader(entity.getContent())); // Date, Open,High,Low,Close,Volume String line = reader.readLine(); //Header while ((line = reader.readLine()) != null) { String[] values = line.split(","); double value = Double.parseDouble(values[type]); retValue = BigDecimal.valueOf(value); } } catch (IOException ex) { System.err.printf("Unable to find market data for: %s - %s\n", names.getHexName(stockName), stockName); } catch (IllegalArgumentException ex) { System.err.printf("Unable to find market data for: %s - %s\n", names.getHexName(stockName), stockName); } finally { if (httpGet != null) { //FIXME: what to do ? } } return retValue; } //FIXME: impliment public BigDecimal fetchData(String stockName, DateTime date, String type) { if (type.compareTo("OPEN") == 0) { return this.fetchDataInternal(stockName, date, openInd); } else if (type.compareTo("HIGH") == 0) { return this.fetchDataInternal(stockName, date, highInd); } else if (type.compareTo("LOW") == 0) { return this.fetchDataInternal(stockName, date, lowhInd); } else if (type.compareTo("CLOSE") == 0) { return this.fetchDataInternal(stockName, date, closehInd); } else if (type.compareTo("VOLUME") == 0) { return this.fetchDataInternal(stockName, date, volumeInd); } return null; } public void storeData(String stockName, DateTime date, BigDecimal value, String type) { throw new UnsupportedOperationException("Not supported yet."); } @Override public double[] fetchDataPeriod(String stockName, DateTime fromDate, DateTime toDate, String type) { throw new UnsupportedOperationException("Not supported yet."); } }