X-Git-Url: http://gitweb.fperrin.net/?p=GpsPrune.git;a=blobdiff_plain;f=src%2Ftim%2Fprune%2Fdata%2FFieldList.java;fp=src%2Ftim%2Fprune%2Fdata%2FFieldList.java;h=26ac966a28a94eff7f45ca953b07f08d36545106;hp=0000000000000000000000000000000000000000;hb=ce6f2161b8596f7018d6a76bff79bc9e571f35fd;hpb=2d8cb72e84d5cc1089ce77baf1e34ea3ea2f8465

diff --git a/src/tim/prune/data/FieldList.java b/src/tim/prune/data/FieldList.java
new file mode 100644
index 0000000..26ac966
--- /dev/null
+++ b/src/tim/prune/data/FieldList.java
@@ -0,0 +1,173 @@
+package tim.prune.data;
+
+/**
+ * Class to hold an ordered list of fields
+ * to match the value list in a data point
+ */
+public class FieldList
+{
+	/** Array of Field objects making the list */
+	private Field[] _fieldArray;
+
+
+	/**
+	 * Constructor for an empty field list
+	 */
+	public FieldList()
+	{
+		_fieldArray = new Field[0];
+	}
+
+	/**
+	 * Constructor for a given number of empty fields
+	 * @param inNumFields
+	 */
+	public FieldList(int inNumFields)
+	{
+		if (inNumFields < 0) inNumFields = 0;
+		_fieldArray = new Field[inNumFields];
+	}
+
+	/**
+	 * Constructor giving array of Field objects
+	 * @param inFieldArray array of Field objects
+	 */
+	public FieldList(Field[] inFieldArray)
+	{
+		if (inFieldArray == null || inFieldArray.length == 0)
+		{
+			_fieldArray = new Field[0];
+		}
+		else
+		{
+			_fieldArray = new Field[inFieldArray.length];
+			System.arraycopy(inFieldArray, 0, _fieldArray, 0, inFieldArray.length);
+		}
+	}
+
+	/**
+	 * Get the index of the given field
+	 * @param inField field to look for
+	 * @return index number of the field starting at zero
+	 */
+	public int getFieldIndex(Field inField)
+	{
+		if (inField == null) return -1;
+		for (int f=0; f<_fieldArray.length; f++)
+		{
+			if (_fieldArray[f] != null && _fieldArray[f].equals(inField))
+				return f;
+		}
+		return -1;
+	}
+
+
+	/**
+	 * Check whether the FieldList contains the given Field object
+	 * @param inField Field to check
+	 * @return true if the FieldList contains the given field
+	 */
+	public boolean contains(Field inField)
+	{
+		return (getFieldIndex(inField) >= 0);
+	}
+
+
+	/**
+	 * @return number of fields in list
+	 */
+	public int getNumFields()
+	{
+		if (_fieldArray == null) return 0;
+		return _fieldArray.length;
+	}
+
+
+	/**
+	 * Get the specified Field object
+	 * @param inIndex index to retrieve
+	 * @return Field object
+	 */
+	public Field getField(int inIndex)
+	{
+		if (_fieldArray == null || inIndex < 0 || inIndex >= _fieldArray.length)
+		{
+			return null;
+		}
+		return _fieldArray[inIndex];
+	}
+
+
+	/**
+	 * Merge this list with a second list, giving a superset
+	 * @param inOtherList other FieldList object to merge
+	 * @return Merged FieldList object
+	 */
+	public FieldList merge(FieldList inOtherList)
+	{
+		// count number of fields
+		int totalFields = _fieldArray.length;
+		for (int f=0; f<inOtherList._fieldArray.length; f++)
+		{
+			if (inOtherList._fieldArray[f] != null && !contains(inOtherList._fieldArray[f]))
+			{
+				totalFields++;
+			}
+		}
+		FieldList list = new FieldList(totalFields);
+		// copy these fields into array
+		System.arraycopy(_fieldArray, 0, list._fieldArray, 0, _fieldArray.length);
+		// copy additional fields from other array if any
+		if (totalFields > _fieldArray.length)
+		{
+			int fieldCounter = _fieldArray.length;
+			for (int f=0; f<inOtherList._fieldArray.length; f++)
+			{
+				if (inOtherList._fieldArray[f] != null && !contains(inOtherList._fieldArray[f]))
+				{
+					list._fieldArray[fieldCounter] = inOtherList._fieldArray[f];
+					fieldCounter++;
+				}
+			}
+		}
+		// return the merged list
+		return list;
+	}
+
+
+	/**
+	 * Extend the field list to include the specified field
+	 * @param inField Field to add
+	 * @return new index of added Field
+	 */
+	public int extendList(Field inField)
+	{
+		// See if field is already in list
+		int currIndex = getFieldIndex(inField);
+		if (currIndex >= 0) return currIndex;
+		// Need to extend - increase array size
+		int oldNumFields = _fieldArray.length;
+		Field[] fields = new Field[oldNumFields + 1];
+		System.arraycopy(_fieldArray, 0, fields, 0, oldNumFields);
+		_fieldArray = fields;
+		// Add new field and return index
+		_fieldArray[oldNumFields] = inField;
+		return oldNumFields;
+	}
+
+
+	/**
+	 * Convert to String for debug
+	 */
+	public String toString()
+	{
+		StringBuffer buffer = new StringBuffer();
+		buffer.append('(');
+		for (int i=0; i<_fieldArray.length; i++)
+		{
+			buffer.append(_fieldArray[i].getName()).append(',');
+		}
+		buffer.append(')');
+		return buffer.toString();
+	}
+}