1 files changed, 81 insertions, 0 deletions
diff --git a/src/main/java/org/traccar/helper/PatternUtil.java b/src/main/java/org/traccar/helper/PatternUtil.java
new file mode 100644
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+++ b/src/main/java/org/traccar/helper/PatternUtil.java
@@ -0,0 +1,81 @@
+/*
+ * Copyright 2015 - 2017 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 org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.lang.management.ManagementFactory;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+import java.util.regex.PatternSyntaxException;
+
+public final class PatternUtil {
+
+    private static final Logger LOGGER = LoggerFactory.getLogger(PatternUtil.class);
+
+    private PatternUtil() {
+    }
+
+    public static class MatchResult {
+        private String patternMatch;
+        private String patternTail;
+        private String stringMatch;
+        private String stringTail;
+
+        public String getPatternMatch() {
+            return patternMatch;
+        }
+
+        public String getPatternTail() {
+            return patternTail;
+        }
+
+        public String getStringMatch() {
+            return stringMatch;
+        }
+
+        public String getStringTail() {
+            return stringTail;
+        }
+    }
+
+    public static MatchResult checkPattern(String pattern, String input) {
+
+        if (!ManagementFactory.getRuntimeMXBean().getInputArguments().toString().contains("-agentlib:jdwp")) {
+            throw new RuntimeException("PatternUtil usage detected");
+        }
+
+        MatchResult result = new MatchResult();
+
+        for (int i = 0; i < pattern.length(); i++) {
+            try {
+                Matcher matcher = Pattern.compile("(" + pattern.substring(0, i) + ").*").matcher(input);
+                if (matcher.matches()) {
+                    result.patternMatch = pattern.substring(0, i);
+                    result.patternTail = pattern.substring(i);
+                    result.stringMatch = matcher.group(1);
+                    result.stringTail = input.substring(matcher.group(1).length());
+                }
+            } catch (PatternSyntaxException error) {
+                LOGGER.warn("Pattern matching error", error);
+            }
+        }
+
+        return result;
+    }
+
+}