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Transport10.java
1package com.gams.examples.transport;
2
3import java.io.File;
4import java.io.FileInputStream;
5import java.io.IOException;
6
7import com.gams.api.GAMSGlobals;
8import com.gams.api.GAMSParameter;
9import com.gams.api.GAMSSet;
10import com.gams.api.GAMSVariableRecord;
11import com.gams.api.GAMSWorkspace;
12import com.gams.api.GAMSWorkspaceInfo;
13
23public class Transport10 {
24
25 public static void main(String[] args) throws IOException {
26 // create a workspace info
27 GAMSWorkspaceInfo wsInfo = new GAMSWorkspaceInfo();
28 // set default a spreadsheet reader
29 String reader = "JXL";
30
31 if (args.length > 0) {
32 // check system directory info from the first command line argument
33 wsInfo.setSystemDirectory( args[0] );
34 // check spreadsheet reader info from the second command line argument
35 if (args.length > 1) {
36 if (args[0].toUpperCase().equals("POI")) {
37 reader = args[0].toUpperCase();
38 }
39 }
40 }
41
42 // create a working directory
43 File workingDirectory = new File(System.getProperty("user.dir"), "Transport10");
44 workingDirectory.mkdir();
45 wsInfo.setWorkingDirectory(workingDirectory.getAbsolutePath());
46
47 // create a workspace
48 GAMSWorkspace ws = new GAMSWorkspace(wsInfo);
49
50 // create a transport model wrapper
51 TransportModel t = new TransportModel(ws);
52
53 if (reader.equals("POI")) {
54 // create a POI spreadsheet reader
55 readPOIFromFile poiReader = new readPOIFromFile(getInputString(ws));
56 poiReader.read(t.geti(), "capacity");
57 poiReader.read(t.geta(), "capacity", false);
58 poiReader.read(t.getj(), "demand");
59 poiReader.read(t.getb(), "demand", false);
60 poiReader.read(t.getd(), "distance", true);
61 poiReader.close();
62 } else {
63 // create a JXL spreadsheet reader
64 try {
65 readJXLFromFile jxlReader = new readJXLFromFile(getInputString(ws));
66 jxlReader.read(t.geti(), "capacity");
67 jxlReader.read(t.geta(), "capacity", false);
68 jxlReader.read(t.getj(), "demand");
69 jxlReader.read(t.getb(), "demand", false);
70 jxlReader.read(t.getd(), "distance", true);
71 jxlReader.close();
72 } catch (jxl.read.biff.BiffException e) {
73 e.printStackTrace();
74 }
75 }
76
77 // set option of all model types for xpress
78 t.getopt().setAllModelTypes("xpress");
79
80 // run the model
81 t.run(System.out);
82
83 // retrieve GAMSVariable "x" from the model wrapper
84 for (GAMSVariableRecord rec : t.getx())
85 System.out.println("x(" + rec.getKey(0) + "," + rec.getKey(1) + "): level=" + rec.getLevel() + " marginal=" + rec.getMarginal());
86 }
87
88 private static String getInputString(GAMSWorkspace ws) {
89 // the directory [path/to/gams] where GAMS has been installed
90 String gamsdir = ws.systemDirectory();
91
92 // read input data from workbook "[path/to/gams]/apifiles/Data/transport.xls"
93 if (!gamsdir.endsWith(GAMSGlobals.FILE_SEPARATOR))
94 gamsdir += GAMSGlobals.FILE_SEPARATOR;
95 return gamsdir + "apifiles" + GAMSGlobals.FILE_SEPARATOR + "Data"
96 + GAMSGlobals.FILE_SEPARATOR + "transport.xls";
97 }
98}
99
105class readJXLFromFile {
106 private jxl.Workbook w;
107
113 public readJXLFromFile(String input) throws IOException, jxl.read.biff.BiffException {
114 File inputFile = new File(input);
115 w = jxl.Workbook.getWorkbook(inputFile);
116 }
117
122 public void read(GAMSSet set, String fromWorksheet) {
123 jxl.Sheet sheet = w.getSheet(fromWorksheet);
124 for(jxl.Cell cell : sheet.getRow(0))
125 set.addRecord( cell.getContents() );
126 }
127
133 public void read(GAMSParameter param, String fromWorksheet, boolean twoDimensioned) {
134 jxl.Sheet sheet = w.getSheet(fromWorksheet);
135 if (twoDimensioned) {
136 for (int j = 1; j < sheet.getColumns(); j++)
137 for (int i = 1; i < sheet.getRows(); i++)
138 param.addRecord( sheet.getCell(0,i).getContents(),
139 sheet.getCell(j,0).getContents()
140 ).setValue( Double.valueOf(sheet.getCell(j,i).getContents()) );
141 } else {
142 for (int j = 0; j < sheet.getColumns(); j++)
143 param.addRecord( sheet.getCell(j, 0).getContents() ).setValue( Double.valueOf(sheet.getCell(j,1).getContents()) );
144 }
145 }
146
148 public void close() {
149 if (w!=null)
150 w.close();
151 }
152}
153
159class readPOIFromFile {
160 private org.apache.poi.hssf.usermodel.HSSFWorkbook workbook;
161 private FileInputStream file;
162
167 public readPOIFromFile(String input) throws IOException {
168 file = new FileInputStream(new File(input));
169 workbook = new org.apache.poi.hssf.usermodel.HSSFWorkbook(file);
170 }
171
176 public void read(GAMSSet set, String fromWorksheet) {
177 org.apache.poi.hssf.usermodel.HSSFSheet sheet = workbook.getSheet(fromWorksheet);
178 fillSetFromRow( set, sheet.getRow( sheet.getFirstRowNum()) );
179 }
180
186 public void read(GAMSParameter param, String fromWorksheet, boolean twoDimensioned) {
187 org.apache.poi.hssf.usermodel.HSSFSheet sheet = workbook.getSheet(fromWorksheet);
188 if (twoDimensioned)
189 fillTwoDimensionedParameterFromSheet(param, sheet);
190 else
191 fillParameterFromSheet( param, sheet );
192 }
193
195 public void close() throws IOException {
196 if (file!=null)
197 file.close();
198 }
199
200 private void fillSetFromRow(GAMSSet set, org.apache.poi.hssf.usermodel.HSSFRow row) {
201 for(org.apache.poi.ss.usermodel.Cell cell : row) {
202 switch(cell.getCellTypeEnum()) {
203 case BOOLEAN: set.addRecord( String.valueOf( cell.getBooleanCellValue() ) ); break;
204 case NUMERIC: set.addRecord( String.valueOf( cell.getNumericCellValue() ) ); break;
205 case STRING: set.addRecord( cell.getStringCellValue() ); break;
206 default: break;
207 }
208 }
209 }
210
211 private void fillParameterFromSheet(GAMSParameter param, org.apache.poi.hssf.usermodel.HSSFSheet sheet) {
212 org.apache.poi.hssf.usermodel.HSSFRow firstRow = sheet.getRow( sheet.getFirstRowNum() );
213 org.apache.poi.hssf.usermodel.HSSFRow row = sheet.getRow( sheet.getLastRowNum() );
214 int idx = 0;
215 for (org.apache.poi.ss.usermodel.Cell cell : row) {
216 switch(cell.getCellTypeEnum()) {
217 case NUMERIC: param.addRecord( firstRow.getCell(idx).getStringCellValue() ).setValue( cell.getNumericCellValue() ); break;
218 case STRING:
219 param.addRecord( firstRow.getCell(idx).getStringCellValue() ).setValue( Double.valueOf( cell.getStringCellValue() )); break;
220 case BOOLEAN:
221 param.addRecord( firstRow.getCell(idx).getStringCellValue() ).setValue( cell.getBooleanCellValue() ? 1 : 0 ); break;
222 default: break;
223 }
224 idx++;
225 }
226 }
227
228 private void fillTwoDimensionedParameterFromSheet(GAMSParameter param, org.apache.poi.hssf.usermodel.HSSFSheet sheet) {
229 for (org.apache.poi.ss.usermodel.Row row : sheet) {
230 if (row.getRowNum() == sheet.getFirstRowNum()) {
231 continue;
232 } else {
233 org.apache.poi.ss.usermodel.Cell cell = row.getCell( 0 );
234 for (short j = 1; j<row.getLastCellNum() ; j++) {
235 cell = row.getCell( j );
236 switch(cell.getCellTypeEnum()) {
237 case NUMERIC:
238 param.addRecord( row.getCell(0).getStringCellValue() ,
239 sheet.getRow(0).getCell( j ).getStringCellValue()
240 ).setValue( cell.getNumericCellValue() );
241 break;
242 case STRING:
243 param.addRecord( row.getCell(0).getStringCellValue() , sheet.getRow( 0 ).getCell( j ).getStringCellValue() ).setValue( Double.valueOf( cell.getStringCellValue() ));
244 break;
245 case BOOLEAN:
246 param.addRecord( row.getCell(0).getStringCellValue() , sheet.getRow( 0 ).getCell( j ).getStringCellValue() ).setValue( cell.getBooleanCellValue() ? 1 : 0 );
247 break;
248 default:
249 break;
250 }
251 }
252 }
253 }
254 }
255}
com::gams::api::GAMSWorkspaceInfo::setSystemDirectory
void setSystemDirectory(String directory)
com::gams::api::GAMSWorkspaceInfo::setWorkingDirectory
void setWorkingDirectory(String directory)
com::gams.examples.transport.Transport10
This example demonstrates how to retrieve an input for GAMS Transport Model from an Excel file (trans...
Definition Transport10.java:23
com::gams.examples.transport.TransportModel
This example shows the wrapper model of a transportation problem based on the simple GAMS [trnsport] ...
Definition TransportModel.java:20
com::gams.examples.transport.TransportModel.getopt
GAMSOptions getopt()
Options for the execution of the trnsport model.
Definition TransportModel.java:118
com::gams.examples.transport.TransportModel.run
void run(GAMSCheckpoint checkpoint)
Executes the trnsport model.
Definition TransportModel.java:62
com::gams.examples.transport.TransportModel.getx
GAMSVariable getx()
x(i,j): shipment quantities in cases
Definition TransportModel.java:112
com::gams.examples.transport.TransportModel.getb
GAMSParameter getb()
b(i): demand at market j in cases
Definition TransportModel.java:103
com::gams.examples.transport.TransportModel.geta
GAMSParameter geta()
a(i): capacity of plant i in cases
Definition TransportModel.java:100
com::gams.examples.transport.TransportModel.getd
GAMSParameter getd()
d(i,j): distance in thousands of miles
Definition TransportModel.java:106
com::gams
Provides package namespace for Java interface and examples to General Algebraic Model System (GAMS).