checkpoint

[anneal.git] / src / edu / berkeley / qfat / stl / StlFileParser.java

diff --git a/src/edu/berkeley/qfat/stl/StlFileParser.java b/src/edu/berkeley/qfat/stl/StlFileParser.java
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+package edu.berkeley.qfat.stl;
+import java.io.StreamTokenizer;
+import java.io.Reader;
+import java.io.IOException;
+
+/**
+ * Title:        STL Loader
+ * Description:  STL files loader (Supports ASCII and binary files) for Java3D
+ *               Needs JDK 1.4 due to endian problems
+ * Copyright:    Copyright (c) 2001
+ * Company:      Universidad del Pais Vasco (UPV/EHU)
+ * @author:      Carlos Pedrinaci Godoy
+ * @version 1.0
+ *
+ * Contact : xenicp@yahoo.es
+ *
+ *   STL FILE PARSER:
+ *   Extends StreamTokenizer
+ *   For Ascii files
+ *   Each token returned is checked in StlFile.java
+ *   Format of an ASCII STL file:
+ *
+ *     solid /users/vis/dru/wedge.stl
+ *       facet normal -1 0 0
+ *         outer loop
+ *           vertex 0.005 1 0
+ *           vertex 0 0.543 0
+ *           vertex 0.453 1 1
+ *         endloop
+ *       endfacet
+ *            .
+ *            .
+ *            .
+ *     endsolid /users/vis/dru/wedge.stl
+ *
+ *  That Class is necessary because scientific numbers are not correctly readed by Tokenizer
+ *  we must then extend that class and define another getNumber
+ */
+
+public class StlFileParser extends StreamTokenizer
+{
+  /**
+   * Constructor: object creation and setup
+   *
+   * @param r The Reader instance
+   */
+  public StlFileParser(Reader r)
+  {
+    super(r);
+    setup();
+  }
+
+  /**
+   * Method that sets some params of the Tokenizer for reading the file correctly
+   */
+  public void setup()
+  {
+    resetSyntax();
+    eolIsSignificant(true);   // The End Of Line is important
+    lowerCaseMode(true);
+
+    // All printable ascii characters
+    wordChars('!', '~');
+
+    whitespaceChars(' ', ' ');
+    whitespaceChars('\n', '\n');
+    whitespaceChars('\r', '\r');
+    whitespaceChars('\t', '\t');
+  }// End setup
+
+  /**
+   * Gets a number from the stream.  Note that we don't recognize
+   * numbers in the tokenizer automatically because numbers might be in
+   * scientific notation, which isn't processed correctly by
+   * StreamTokenizer.  The number is returned in nval.
+   *
+   * @return boolean.
+   */
+  boolean getNumber()
+  {
+    int t;
+
+    try {
+        nextToken();
+       if (ttype != TT_WORD)
+         throw new IOException("Expected number on line " + lineno());
+       nval =  (Double.valueOf(sval)).doubleValue();
+    }
+    catch (IOException e) {
+      System.err.println(e.getMessage());
+      return false;
+    }
+    catch (NumberFormatException e) {
+      System.err.println(e.getMessage());
+      return false;
+    }
+    return true;
+  } // end of getNumber
+
+}// End of StlFileParser