From a1081fad2f0b4fa1668ee2eb175d7c71fcc8ae8c Mon Sep 17 00:00:00 2001
From: Anton Tananaev <anton.tananaev@gmail.com>
Date: Sun, 25 Oct 2015 22:19:48 +1300
Subject: Implement buffer string finder

---
 src/org/traccar/helper/StringFinder.java           | 41 ++++++++++++++++++++++
 .../org/traccar/helper/ChannelBufferToolsTest.java |  2 --
 test/org/traccar/helper/StringFinderTest.java      | 29 +++++++++++++++
 3 files changed, 70 insertions(+), 2 deletions(-)
 create mode 100644 src/org/traccar/helper/StringFinder.java
 create mode 100644 test/org/traccar/helper/StringFinderTest.java

diff --git a/src/org/traccar/helper/StringFinder.java b/src/org/traccar/helper/StringFinder.java
new file mode 100644
index 000000000..da6a9bdc2
--- /dev/null
+++ b/src/org/traccar/helper/StringFinder.java
@@ -0,0 +1,41 @@
+/*
+ * Copyright 2015 Anton Tananaev (anton.tananaev@gmail.com)
+ *
+ * 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.jboss.netty.buffer.ChannelBuffer;
+import org.jboss.netty.buffer.ChannelBufferIndexFinder;
+
+import java.nio.charset.Charset;
+
+public class StringFinder implements ChannelBufferIndexFinder {
+
+    private String string;
+
+    public StringFinder(String string) {
+        this.string = string;
+    }
+
+    @Override
+    public boolean find(ChannelBuffer buffer, int guessedIndex) {
+
+        if (buffer.writerIndex() - guessedIndex < string.length()) {
+            return false;
+        }
+
+        return string.equals(buffer.toString(guessedIndex, string.length(), Charset.defaultCharset()));
+    }
+
+}
diff --git a/test/org/traccar/helper/ChannelBufferToolsTest.java b/test/org/traccar/helper/ChannelBufferToolsTest.java
index 744d3eb43..3d065a8d7 100644
--- a/test/org/traccar/helper/ChannelBufferToolsTest.java
+++ b/test/org/traccar/helper/ChannelBufferToolsTest.java
@@ -9,8 +9,6 @@ import org.junit.Test;
 
 public class ChannelBufferToolsTest {
     
-    private final ChannelBufferFactory factory = new HeapChannelBufferFactory();
-
     @Test
     public void testReadHexInteger() {
         byte[] buf = {0x01, (byte) 0x90, 0x34};
diff --git a/test/org/traccar/helper/StringFinderTest.java b/test/org/traccar/helper/StringFinderTest.java
new file mode 100644
index 000000000..71f9215db
--- /dev/null
+++ b/test/org/traccar/helper/StringFinderTest.java
@@ -0,0 +1,29 @@
+package org.traccar.helper;
+
+import org.jboss.netty.buffer.ChannelBuffer;
+import org.jboss.netty.buffer.ChannelBufferFactory;
+import org.jboss.netty.buffer.ChannelBuffers;
+import org.jboss.netty.buffer.HeapChannelBufferFactory;
+import org.junit.Assert;
+import org.junit.Test;
+
+import java.nio.charset.Charset;
+
+import static org.junit.Assert.assertArrayEquals;
+import static org.junit.Assert.assertEquals;
+
+public class StringFinderTest {
+    
+    @Test
+    public void testFind() {
+
+        ChannelBuffer buf = ChannelBuffers.copiedBuffer("hello world", Charset.defaultCharset());
+
+        Assert.assertEquals(-1, buf.indexOf(0, buf.writerIndex(), new StringFinder("bar")));
+        Assert.assertEquals(6, buf.indexOf(0, buf.writerIndex(), new StringFinder("world")));
+        Assert.assertEquals(-1, buf.indexOf(0, buf.writerIndex(), new StringFinder("worlds")));
+        Assert.assertEquals(0, buf.indexOf(0, buf.writerIndex(), new StringFinder("hell")));
+
+    }
+
+}
-- 
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