source: trunk/org/expeditee/io/ExpReader.java@ 4

Last change on this file since 4 was 4, checked in by davidb, 16 years ago

Starting source code to Expeditee
File size: 10.3 KB
Line 
1package org.expeditee.io;
2
3import java.awt.Color;
4import java.awt.Font;
5import java.awt.Point;
6import java.io.BufferedReader;
7import java.io.FileReader;
8import java.io.IOException;
9import java.lang.reflect.Method;
10import java.util.HashMap;
11import java.util.LinkedHashMap;
12import java.util.List;
13
14import org.expeditee.gui.Frame;
15import org.expeditee.items.Constraint;
16import org.expeditee.items.Dot;
17import org.expeditee.items.Item;
18import org.expeditee.items.Line;
19import org.expeditee.items.Text;
20
21/**
22 * Reads in Exp format files and constructs the Frame and Item objects they
23 * contain.
24 *
25 * @author mrww1
26 *
27 */
28public class ExpReader implements FrameReader {
29
30 public static final String EXTENTION = ".exp";
31
32 private BufferedReader _reader = null;
33
34 private static LinkedHashMap<Character, Method> _ItemTags = null;
35
36 private static LinkedHashMap<Character, Method> _FrameTags = null;
37
38 private String _frameName;
39
40 /**
41 * Does nothing, location must be set before use
42 */
43 public ExpReader(String frameName) {
44 _frameName = frameName;
45
46 if (_ItemTags != null && _FrameTags != null)
47 return;
48
49 _ItemTags = new LinkedHashMap<Character, Method>();
50 _FrameTags = new LinkedHashMap<Character, Method>();
51
52 Class[] pString = { String.class };
53 Class[] pInt = { int.class };
54 Class[] pFloat = { float.class };
55 Class[] pColor = { Color.class };
56 Class[] pBool = { boolean.class };
57 Class[] pFont = { Font.class };
58 Class[] pPoint = { Point.class };
59 Class[] pArrow = { int.class, double.class };
60 Class[] pList = { List.class };
61 Class[] pIntArray = { int[].class };
62 Class[] pItem = { Item.class };
63
64 try {
65 _FrameTags.put('V', Frame.class.getMethod("setVersion", pInt));
66 _FrameTags
67 .put('p', Frame.class.getMethod("setProtection", pString));
68 _FrameTags.put('U', Frame.class.getMethod("setOwner", pString));
69 _FrameTags.put('D', Frame.class
70 .getMethod("setDateCreated", pString));
71 _FrameTags.put('M', Frame.class.getMethod("setLastModifyUser",
72 pString));
73 _FrameTags.put('d', Frame.class.getMethod("setLastModifyDate",
74 pString));
75 _FrameTags
76 .put('F', Frame.class.getMethod("setFrozenDate", pString));
77
78 _FrameTags.put('O', Frame.class.getMethod("setForegroundColor",
79 pColor));
80 _FrameTags.put('B', Frame.class.getMethod("setBackgroundColor",
81 pColor));
82
83 _ItemTags.put('S', Item.class.getMethod("setID", pInt));
84 _ItemTags.put('s', Item.class.getMethod("setDateCreated", pString));
85 _ItemTags.put('d', Item.class.getMethod("setColor", pColor));
86 _ItemTags.put('G', Item.class.getMethod("setBackgroundColor",
87 pColor));
88 _ItemTags.put('P', Item.class.getMethod("setPosition", pPoint));
89 _ItemTags.put('F', Item.class.getMethod("setLink", pString));
90 _ItemTags.put('X', Item.class.getMethod("setAction", pList));
91 _ItemTags.put('x', Item.class.getMethod("setActionMark", pBool));
92 _ItemTags.put('U', Item.class.getMethod("setActionCursorEnter",
93 pList));
94 _ItemTags.put('V', Item.class.getMethod("setActionCursorLeave",
95 pList));
96 _ItemTags.put('W', Item.class.getMethod("setActionEnterFrame",
97 pList));
98 _ItemTags.put('Y', Item.class.getMethod("setActionLeaveFrame",
99 pList));
100 _ItemTags.put('D', Item.class.getMethod("setData", pString));
101 _ItemTags.put('u', Item.class.getMethod("setHighlight", pBool));
102 _ItemTags.put('e', Item.class.getMethod("setFillColor", pColor));
103 _ItemTags.put('i', Item.class.getMethod("setFillPattern", pString));
104 _ItemTags.put('o', Item.class.getMethod("setOwner", pString));
105 _ItemTags.put('n', Item.class.getMethod("setLinkMark", pBool));
106 _ItemTags
107 .put('q', Item.class.getMethod("setLinkFrameset", pString));
108 _ItemTags
109 .put('y', Item.class.getMethod("setLinkTemplate", pString));
110 _ItemTags.put('g', Item.class
111 .getMethod("setLinePattern", pIntArray));
112
113 _ItemTags.put('j', Item.class.getMethod("setArrow", pArrow));
114
115 _ItemTags.put('f', Text.class.getMethod("setFont", pFont));
116 _ItemTags.put('t', Text.class.getMethod("setSpacing", pInt));
117 _ItemTags.put('T', Text.class.getMethod("appendLine", pString));
118
119 _ItemTags.put('a', Text.class.getMethod("setWordSpacing", pInt));
120 _ItemTags.put('b', Text.class.getMethod("setLetterSpacing", pInt));
121 _ItemTags.put('m', Text.class.getMethod("setInitialSpacing", pInt));
122 _ItemTags.put('w', Text.class.getMethod("setWidth", pInt));
123 _ItemTags.put('k', Text.class.getMethod("setJustification", pInt));
124
125 _ItemTags.put('h', Dot.class.getMethod("setThickness", pFloat));
126 _ItemTags.put('l', Item.class.getMethod("setLineIDs", pString));
127 _ItemTags
128 .put('c', Dot.class.getMethod("setConstraintIDs", pString));
129
130 // Lines and constraints are created differently
131 _ItemTags.put('L', Line.class.getMethod("setStartItem", pItem));
132 _ItemTags.put('C', Constraint.class.getMethod("getID",
133 (Class[]) null));
134 } catch (Exception e) {
135 e.printStackTrace();
136 }
137 }
138
139 /**
140 * Determines whether a string begins with a KMS tag.
141 *
142 * @param s
143 * a line of text
144 * @return true if s begins with a KMS tag
145 */
146 private boolean isValidLine(String s) {
147 return s.length() >= 2 && s.charAt(1) == ' '
148 && Character.isLetter(s.charAt(0));
149 }
150
151 /**
152 * Reads a KMS file with the given name from disk.
153 *
154 * @param frameName
155 * the name of the Frame to read in from a file.
156 * @return A new Frame object that contains any Items described in the file.
157 * @throws IOException
158 * Any exceptions occured by the BufferedReader.
159 */
160 public Frame readFrame(String fullpath) throws IOException {
161 _reader = new BufferedReader(new FileReader(fullpath));
162 String next = "";
163 Frame newFrame = new Frame();
164
165 try {
166 //Framename must be set before setting the frame number
167 newFrame.setFrameName(_frameName);
168
169 // First read all the header lines
170 while (_reader.ready() && !(next = _reader.readLine()).equals("Z")) {
171 if (isValidLine(next)) {
172 processHeaderLine(newFrame, next);
173 }
174 }
175
176 // Now read all the items
177 Item currentItem = null;
178 while (_reader.ready() && !(next = _reader.readLine()).equals("Z")) {
179 // if this is the start of a new item add a new item
180 if (isValidLine(next) ) {
181 if (getTag(next) == 'S') {
182 String value = getValue(next);
183 int id = Integer.parseInt(value.substring(2));
184
185 switch (value.charAt(0)) {
186 case 'P': //check if its a point
187 currentItem = new Dot(id);
188 _linePoints.put(currentItem.getID(), currentItem);
189 break;
190 default:
191 currentItem = new Text(id);
192 break;
193 }
194 newFrame.addItem(currentItem);
195 } else if (currentItem != null) {
196 processBodyLine(currentItem, next);
197 }
198 }
199 }
200
201 // Read the lines
202 while (_reader.ready() && !(next = _reader.readLine()).equals("Z")) {
203 if (isValidLine(next)) {
204 java.awt.Point idtype = separateValues(next.substring(2));
205 // The next line must be the endpoints
206 if (!_reader.ready())
207 throw new Exception("Unexpected end of file");
208 next = _reader.readLine();
209 java.awt.Point startend = separateValues(next.substring(2));
210 int start = startend.x;
211 int end = startend.y;
212
213 if (_linePoints.get(start) != null
214 && _linePoints.get(end) != null) {
215 newFrame.addItem(new Line(_linePoints.get(start),
216 _linePoints.get(end), idtype.x));
217 } else {
218 System.out
219 .println("Error reading line with unknown end points");
220 }
221 }
222 }
223
224 // Read the constraints
225 while (_reader.ready() && !(next = _reader.readLine()).equals("Z")) {
226 if (isValidLine(next)) {
227 java.awt.Point idtype = separateValues(next.substring(2));
228 // The next line must be the endpoints
229 if (!_reader.ready())
230 throw new Exception("Unexpected end of file");
231 next = _reader.readLine();
232 java.awt.Point startend = separateValues(next.substring(2));
233
234 Dot a = (Dot) _linePoints.get(startend.x);
235 Dot b = (Dot) _linePoints.get(startend.y);
236
237 new Constraint(a, b, idtype.x, idtype.y);
238 }
239 }
240
241 } catch (Exception e) {
242 System.out.println("Error reading frame file line: " + next + " "
243 + e.getMessage());
244 }
245
246 _reader.close();
247 newFrame.setChanged(false);
248
249 return newFrame;
250 }
251
252 // Stores points used when constructing lines
253 private HashMap<Integer, Item> _linePoints = new HashMap<Integer, Item>();
254
255 /**
256 * Processes the body section of the Exp file, which contains all Items
257 *
258 * @param frame
259 * The Frame to add any created Items to.
260 * @param line
261 * The line of text read in from the file to process.
262 */
263 private void processBodyLine(Item item, String line) {
264 // separate the tag from the value
265 Character tag = getTag(line);
266 String value = getValue(line);
267
268 Method toRun = _ItemTags.get(tag);
269 if (toRun == null)
270 System.out.println("Error accessing tag method: " + tag);
271 Object[] vals = Conversion.Convert(toRun, value);
272
273 try {
274 if (vals != null)
275 toRun.invoke(item, vals);
276 } catch (Exception e) {
277 System.out.println("Error running tag method: " + tag);
278 //e.printStackTrace();
279 }
280 }
281
282 private Character getTag(String line) {
283 assert (line.length() > 0);
284 return line.charAt(0);
285 }
286
287 private String getValue(String line) {
288 if (line.length() > 2)
289 return line.substring(2);
290 else
291 return "";
292 }
293
294 /**
295 * Reads the header section of the file, which contains information about
296 * the Frame.
297 *
298 * @param frame
299 * The Frame to assign the read values to.
300 * @param line
301 * The line from the file to process.
302 * @return False if the end of the header has been reached, True otherwise.
303 */
304 private void processHeaderLine(Frame frame, String line) throws IOException {
305 // first separate the tag from the text
306 Character tag = getTag(line);
307 String value = getValue(line);
308 Method toRun = _FrameTags.get(tag);
309
310 if (toRun == null) {
311 System.out.println("Tag '" + tag + "' in '" + line
312 + "' is not supported.");
313 return;
314 }
315
316 Object[] vals = Conversion.Convert(toRun, value);
317 try {
318 toRun.invoke(frame, vals);
319 } catch (Exception e) {
320 System.out.println("Error running method: " + toRun.toGenericString());
321 e.printStackTrace();
322 }
323 }
324
325 // Returns a point from a String containing two ints separated by a space
326 private java.awt.Point separateValues(String line) {
327 int x = Integer.parseInt(line.substring(0, line.indexOf(" ")));
328 int y = Integer.parseInt(line.substring(line.indexOf(" ") + 1));
329
330 return new java.awt.Point(x, y);
331 }
332}
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