X-Git-Url: http://gitweb.fperrin.net/?p=GpsPrune.git;a=blobdiff_plain;f=src%2Ftim%2Fprune%2Fload%2FContentCacher.java;fp=src%2Ftim%2Fprune%2Fload%2FContentCacher.java;h=623abdaccf2709cf4518f02a49fc47a9f5ee8509;hp=0000000000000000000000000000000000000000;hb=8b20e3e027058cdf6ff52993ee5576193d08667a;hpb=2302358503c38817e19f6e529f6c9e530aac0e86

diff --git a/src/tim/prune/load/ContentCacher.java b/src/tim/prune/load/ContentCacher.java
new file mode 100644
index 0000000..623abda
--- /dev/null
+++ b/src/tim/prune/load/ContentCacher.java
@@ -0,0 +1,90 @@
+package tim.prune.load;
+
+import java.util.ArrayList;
+
+/**
+ * General point data cacher
+ */
+public abstract class ContentCacher
+{
+	/** Array to hold lines of file */
+	private String[] _contentArray = null;
+
+
+	/**
+	 * @return Contents of the file as array of non-blank Strings
+	 */
+	public String[] getContents()
+	{
+		return _contentArray;
+	}
+
+
+	/**
+	 * Get the top section of the file for preview
+	 * @param inNumRows number of lines to extract
+	 * @param inMaxWidth max length of Strings (longer ones will be chopped)
+	 * @return String array containing non-blank lines from the file
+	 */
+	public String[] getSnippet(int inNumRows, int inMaxWidth)
+	{
+		final int MIN_SNIPPET_SIZE = 3;
+		// Check size is within sensible limits
+		int numToCopy = inNumRows;
+		if (numToCopy > getNumLines()) numToCopy = getNumLines();
+		int size = numToCopy;
+		if (size < MIN_SNIPPET_SIZE) size = MIN_SNIPPET_SIZE;
+		String[] result = new String[size];
+		// Copy Strings across
+		System.arraycopy(_contentArray, 0, result, 0, numToCopy);
+		// Chop Strings to max width if necessary
+		if (inMaxWidth > 10)
+		{
+			for (int i=0; i<size; i++)
+			{
+				if (result[i] == null)
+					result[i] = "";
+				else
+				{
+					if (result[i].length() > inMaxWidth)
+						result[i] = result[i].trim();
+					if (result[i].length() > inMaxWidth)
+						result[i] = result[i].substring(0, inMaxWidth);
+				}
+			}
+		}
+		return result;
+	}
+
+	/**
+	 * @return the number of non-blank lines in the file
+	 */
+	public int getNumLines()
+	{
+		return _contentArray.length;
+	}
+
+
+	/**
+	 * Clear the memory
+	 */
+	public void clear()
+	{
+		_contentArray = null;
+	}
+
+	/**
+	 * Populate the string array
+	 * @param inList list of lines
+	 */
+	protected void setContents(ArrayList<String> inList)
+	{
+		// Convert into String array for keeps
+		int numLines = inList.size();
+		_contentArray = new String[numLines];
+		for (int i=0; i<numLines; i++)
+		{
+			_contentArray[i] = inList.get(i);
+		}
+	}
+}