X-Git-Url: http://gitweb.fperrin.net/?p=GpsPrune.git;a=blobdiff_plain;f=src%2Ftim%2Fprune%2Fload%2FFileSplitter.java;fp=src%2Ftim%2Fprune%2Fload%2FFileSplitter.java;h=60c2c5dbcf5e429e21d4d3d76a18460d273b0525;hp=0000000000000000000000000000000000000000;hb=ce6f2161b8596f7018d6a76bff79bc9e571f35fd;hpb=2d8cb72e84d5cc1089ce77baf1e34ea3ea2f8465

diff --git a/src/tim/prune/load/FileSplitter.java b/src/tim/prune/load/FileSplitter.java
new file mode 100644
index 0000000..60c2c5d
--- /dev/null
+++ b/src/tim/prune/load/FileSplitter.java
@@ -0,0 +1,140 @@
+package tim.prune.load;
+
+/**
+ * Class responsible for splitting the file contents into an array
+ * based on the selected delimiter character
+ */
+public class FileSplitter
+{
+	private FileCacher _cacher = null;
+	private int _numRows = 0;
+	private int _numColumns = 0;
+	private boolean[] _columnStates = null;
+	private String[] _firstFullRow = null;
+
+
+	/**
+	 * Constructor
+	 * @param inCacher FileCacher object holding file contents
+	 */
+	public FileSplitter(FileCacher inCacher)
+	{
+		_cacher = inCacher;
+	}
+
+	/**
+	 * Split the FileCacher's contents into a 2d array
+	 * @param inDelim delimiter character
+	 * @return 2d Object array
+	 */
+	public String[][] splitFieldData(char inDelim)
+	{
+		_firstFullRow = null;
+		if (_cacher == null) return null;
+		String[] contents = _cacher.getContents();
+		if (contents == null || contents.length == 0) return null;
+		String delimStr = checkDelimiter(inDelim);
+		// Count non-blank rows and max field count
+		_numRows = 0;
+		int maxFields = 0;
+		for (int i=0; i<contents.length; i++)
+		{
+			if (contents[i] != null && !contents[i].trim().equals(""))
+			{
+				_numRows++;
+				String[] splitLine = contents[i].split(delimStr);
+				if (splitLine != null && splitLine.length > maxFields)
+				{
+					maxFields = splitLine.length;
+					_firstFullRow = splitLine;
+				}
+			}
+		}
+		_numColumns = maxFields;
+		_columnStates = new boolean[maxFields];
+
+		// Create array and populate it
+		// Note that array will be rectangular even if data is ragged
+		String[][] result = new String[_numRows][];
+		for (int i=0; i<contents.length; i++)
+		{
+			result[i] = new String[maxFields];
+			if (contents[i] != null)
+			{
+				String wholeLine = contents[i];
+				if (!wholeLine.trim().equals(""))
+				{
+					// Don't use trimmed string here because you'll lose empty fields at beginning
+					// if separated by spaces or tabs
+					String[] splitLine = wholeLine.split(delimStr);
+					if (splitLine != null)
+					{
+						System.arraycopy(splitLine, 0, result[i], 0, splitLine.length);
+						// Check if columns are blank or not
+						for (int j=0; j<splitLine.length; j++)
+						{
+							if (!_columnStates[j] && splitLine[j].trim().length() > 0)
+							{
+								_columnStates[j] = true;
+							}
+						}
+					}
+				}
+			}
+		}
+		return result;
+	}
+
+
+	/**
+	 * @return the number of rows in the data
+	 */
+	public int getNumRows()
+	{
+		return _numRows;
+	}
+
+
+	/**
+	 * @return the number of columns in the data
+	 */
+	public int getNumColumns()
+	{
+		return _numColumns;
+	}
+
+	/**
+	 * @return the fields in the first full row
+	 */
+	public String[] getFirstFullRow()
+	{
+		return _firstFullRow;
+	}
+
+
+	/**
+	 * Check if the specified column of the data is blank
+	 * @param inColumnNum number of column, starting with 0
+	 * @return true if no data exists in this column
+	 */
+	public boolean isColumnBlank(int inColumnNum)
+	{
+		// Should probably trap out of range values
+		return !_columnStates[inColumnNum];
+	}
+
+	/**
+	 * Check the delimiter for proper regular expression matching
+	 * @param inDelim character selected as delimiter
+	 * @return regular expression for splitting
+	 */
+	private static String checkDelimiter(char inDelim)
+	{
+		String result = "" + inDelim;
+		// Don't pass asterisks or dots without escaping them for RE
+		if (inDelim == '*' || inDelim == '.') {
+			result = "\\" + result;
+		}
+		return result;
+	}
+}