1 files changed, 98 insertions, 0 deletions
diff --git a/src/main/java/org/traccar/helper/PatternBuilder.java b/src/main/java/org/traccar/helper/PatternBuilder.java
new file mode 100644
index 000000000..5c4638189
--- /dev/null
+++ b/src/main/java/org/traccar/helper/PatternBuilder.java
@@ -0,0 +1,98 @@
+/*
+ * Copyright 2015 Anton Tananaev (anton@traccar.org)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.traccar.helper;
+
+import java.util.ArrayList;
+import java.util.regex.Pattern;
+
+public class PatternBuilder {
+
+    private final ArrayList<String> fragments = new ArrayList<>();
+
+    public PatternBuilder optional() {
+        return optional(1);
+    }
+
+    public PatternBuilder optional(int count) {
+        fragments.add(fragments.size() - count, "(?:");
+        fragments.add(")?");
+        return this;
+    }
+
+    public PatternBuilder expression(String s) {
+        s = s.replaceAll("\\|$", "\\\\|"); // special case for delimiter
+
+        fragments.add(s);
+        return this;
+    }
+
+    public PatternBuilder text(String s) {
+        fragments.add(s.replaceAll("([\\\\\\.\\[\\{\\(\\)\\*\\+\\?\\^\\$\\|])", "\\\\$1"));
+        return this;
+    }
+
+    public PatternBuilder number(String s) {
+        s = s.replace("dddd", "d{4}").replace("ddd", "d{3}").replace("dd", "d{2}");
+        s = s.replace("xxxx", "x{4}").replace("xxx", "x{3}").replace("xx", "x{2}");
+
+        s = s.replace("d", "\\d").replace("x", "[0-9a-fA-F]").replaceAll("([\\.])", "\\\\$1");
+        s = s.replaceAll("\\|$", "\\\\|").replaceAll("^\\|", "\\\\|"); // special case for delimiter
+
+        fragments.add(s);
+        return this;
+    }
+
+    public PatternBuilder any() {
+        fragments.add(".*");
+        return this;
+    }
+
+    public PatternBuilder binary(String s) {
+        fragments.add(s.replaceAll("(\\p{XDigit}{2})", "\\\\$1"));
+        return this;
+    }
+
+    public PatternBuilder or() {
+        fragments.add("|");
+        return this;
+    }
+
+    public PatternBuilder groupBegin() {
+        return expression("(?:");
+    }
+
+    public PatternBuilder groupEnd() {
+        return expression(")");
+    }
+
+    public PatternBuilder groupEnd(String s) {
+        return expression(")" + s);
+    }
+
+    public Pattern compile() {
+        return Pattern.compile(toString(), Pattern.DOTALL);
+    }
+
+    @Override
+    public String toString() {
+        StringBuilder builder = new StringBuilder();
+        for (String fragment : fragments) {
+            builder.append(fragment);
+        }
+        return builder.toString();
+    }
+
+}