From 19e189ef9ed67f382fea00e48f997ce8e979f030 Mon Sep 17 00:00:00 2001
From: Christopher Baines <cbaines8@gmail.com>
Date: Wed, 14 Mar 2012 01:00:56 +0000
Subject: Update for beta release.

---
 .../cbaines/suma/StringPOIDistanceComparator.java  | 134 +++++++++++++++++++++
 1 file changed, 134 insertions(+)
 create mode 100644 src/net/cbaines/suma/StringPOIDistanceComparator.java

(limited to 'src/net/cbaines/suma/StringPOIDistanceComparator.java')

diff --git a/src/net/cbaines/suma/StringPOIDistanceComparator.java b/src/net/cbaines/suma/StringPOIDistanceComparator.java
new file mode 100644
index 0000000..e8a7539
--- /dev/null
+++ b/src/net/cbaines/suma/StringPOIDistanceComparator.java
@@ -0,0 +1,134 @@
+/*
+ * Southampton University Map App
+ * Copyright (C) 2011  Christopher Baines
+ * 
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+
+package net.cbaines.suma;
+
+import java.util.Comparator;
+
+public class StringPOIDistanceComparator implements Comparator<POI> {
+	private String userString;
+
+	// private static final String TAG = "StringDistanceComparator";
+
+	public StringPOIDistanceComparator(String userString) {
+		super();
+		this.userString = userString;
+	}
+
+	public int compare(POI poi1, POI poi2) {
+		int distTo1 = Math.min(LD(userString, poi1.toString()), LD(userString, poi1.id));
+		// Log.i(TAG, "Comparing " + userString + " and " + poi1.toString() +
+		// " got dist " + distTo1);
+		int distTo2 = Math.min(LD(userString, poi2.toString()), LD(userString, poi2.id));
+		// Log.i(TAG, "Comparing " + userString + " and " + poi2.toString() +
+		// " got dist " + distTo2);
+		return distTo1 - distTo2;
+	}
+
+	// Below is public domain code from http://www.merriampark.com/ld.htm
+
+	// ****************************
+	// Get minimum of three values
+	// ****************************
+
+	private int Minimum(int a, int b, int c) {
+		int mi;
+
+		mi = a;
+		if (b < mi) {
+			mi = b;
+		}
+		if (c < mi) {
+			mi = c;
+		}
+		return mi;
+
+	}
+
+	// *****************************
+	// Compute Levenshtein distance
+	// *****************************
+
+	public int LD(String s, String t) {
+		int d[][]; // matrix
+		int n; // length of s
+		int m; // length of t
+		int i; // iterates through s
+		int j; // iterates through t
+		char s_i; // ith character of s
+		char t_j; // jth character of t
+		int cost; // cost
+
+		// Step 1
+
+		n = s.length();
+		m = t.length();
+		if (n == 0) {
+			return m;
+		}
+		if (m == 0) {
+			return n;
+		}
+		d = new int[n + 1][m + 1];
+
+		// Step 2
+
+		for (i = 0; i <= n; i++) {
+			d[i][0] = i;
+		}
+
+		for (j = 0; j <= m; j++) {
+			d[0][j] = j;
+		}
+
+		// Step 3
+
+		for (i = 1; i <= n; i++) {
+
+			s_i = s.charAt(i - 1);
+
+			// Step 4
+
+			for (j = 1; j <= m; j++) {
+
+				t_j = t.charAt(j - 1);
+
+				// Step 5
+
+				if (s_i == t_j) {
+					cost = 0;
+				} else {
+					cost = 1;
+				}
+
+				// Step 6
+
+				d[i][j] = Minimum(d[i - 1][j] + 1, d[i][j - 1] + 1, d[i - 1][j - 1] + cost);
+
+			}
+
+		}
+
+		// Step 7
+
+		return d[n][m];
+
+	}
+
+}
-- 
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