1 files changed, 94 insertions, 0 deletions
diff --git a/src/main/java/de/pixart/messenger/utils/FtsUtils.java b/src/main/java/de/pixart/messenger/utils/FtsUtils.java
new file mode 100644
index 000000000..86eeeeeaf
--- /dev/null
+++ b/src/main/java/de/pixart/messenger/utils/FtsUtils.java
@@ -0,0 +1,94 @@
+/*
+ * Copyright (c) 2018, Daniel Gultsch All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ * list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation and/or
+ * other materials provided with the distribution.
+ *
+ * 3. Neither the name of the copyright holder nor the names of its contributors
+ * may be used to endorse or promote products derived from this software without
+ * specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+package de.pixart.messenger.utils;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+import java.util.Locale;
+
+public class FtsUtils {
+
+    private static List<String> KEYWORDS = Arrays.asList("OR", "AND");
+
+    public static List<String> parse(String input) {
+        List<String> term = new ArrayList<>();
+        for (String part : input.split("\\s+")) {
+            if (part.isEmpty()) {
+                continue;
+            }
+            final String cleaned = part.substring(getStartIndex(part), getEndIndex(part) + 1);
+            if (isKeyword(cleaned)) {
+                term.add(part);
+            } else {
+                term.add(cleaned);
+            }
+        }
+        return term;
+    }
+
+    public static String toMatchString(List<String> terms) {
+        StringBuilder builder = new StringBuilder();
+        for (String term : terms) {
+            if (builder.length() != 0) {
+                builder.append(' ');
+            }
+            if (isKeyword(term)) {
+                builder.append(term.toUpperCase(Locale.ENGLISH));
+            } else if (term.contains("*") || term.startsWith("-")) {
+                builder.append(term);
+            } else {
+                builder.append('*').append(term).append('*');
+            }
+        }
+        return builder.toString();
+    }
+
+    public static boolean isKeyword(String term) {
+        return KEYWORDS.contains(term.toUpperCase(Locale.ENGLISH));
+    }
+
+    private static int getStartIndex(String term) {
+        int index = 0;
+        while (term.charAt(index) == '*') {
+            ++index;
+        }
+        return index;
+    }
+
+    private static int getEndIndex(String term) {
+        int index = term.length() - 1;
+        while (term.charAt(index) == '*') {
+            --index;
+        }
+        return index;
+    }
+
+}
+\ No newline at end of file