diff --git a/apps/pcep-api/src/main/java/org/onosproject/pcep/tools/PcepTools.java b/apps/pcep-api/src/main/java/org/onosproject/pcep/tools/PcepTools.java
new file mode 100644
index 0000000..28eaebd
--- /dev/null
+++ b/apps/pcep-api/src/main/java/org/onosproject/pcep/tools/PcepTools.java
@@ -0,0 +1,119 @@
+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * 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.onosproject.pcep.tools;
+
+import javax.xml.bind.DatatypeConverter;
+
+/**
+ * tools fo pcep app.
+ */
+public abstract class PcepTools {
+
+    private PcepTools() {
+
+    }
+
+    /**
+     * Converts decimal byte array to a hex string.
+     *
+     * @param byteArray byte array
+     * @return a hex string
+     */
+    public static String toHexString(byte[] byteArray) {
+        return DatatypeConverter.printHexBinary(byteArray);
+    }
+
+    /**
+     * Converts a hex string to a decimal byte array.
+     *
+     * @param hexString a hex string
+     * @return byte array
+     */
+    public static byte[] toByteArray(String hexString) {
+        return DatatypeConverter.parseHexBinary(hexString);
+    }
+
+    /**
+     * Converts a byte array to a decimal string.
+     *
+     * @param bytes a byte array
+     * @return a decimal string
+     */
+    public static String toDecimalString(byte[] bytes) {
+        String str = "";
+        for (int i = 0; i < bytes.length; i++) {
+            str += String.valueOf(bytes[i]);
+        }
+        return str;
+    }
+
+    /**
+     * convert a string to the form of ip address.
+     *
+     * @param str a string
+     * @return a string with ip format
+     */
+    public static String stringToIp(String str) {
+        long ipInt = Long.parseLong(str, 16);
+        return longToIp(ipInt);
+    }
+
+    /**
+     * convert a long to ip format.
+     *
+     * @param ipLong a decimal number.
+     * @return a ip format string
+     */
+    public static String longToIp(long ipLong) {
+        StringBuilder sb = new StringBuilder();
+        sb.append((ipLong >> 24) & 0xFF).append(".");
+        sb.append((ipLong >> 16) & 0xFF).append(".");
+        sb.append((ipLong >> 8) & 0xFF).append(".");
+        sb.append(ipLong & 0xFF);
+        return sb.toString();
+    }
+
+    /**
+     * convert a string with ip format to a long.
+     *
+     * @param strIp a string with ip format
+     * @return a long number
+     */
+    public static long ipToLong(String strIp) {
+        long[] ip = new long[4];
+        int position1 = strIp.indexOf(".");
+        int position2 = strIp.indexOf(".", position1 + 1);
+        int position3 = strIp.indexOf(".", position2 + 1);
+        ip[0] = Long.parseLong(strIp.substring(0, position1));
+        ip[1] = Long.parseLong(strIp.substring(position1 + 1, position2));
+        ip[2] = Long.parseLong(strIp.substring(position2 + 1, position3));
+        ip[3] = Long.parseLong(strIp.substring(position3 + 1));
+        return (ip[0] << 24) + (ip[1] << 16) + (ip[2] << 8) + ip[3];
+    }
+
+    /**
+     * get a integer value from a cut string.
+     *
+     * @param str a whole string
+     * @param base cut the string from this index
+     * @param offset the offset when execute the cut
+     * @return a integer value
+     */
+    public static int tranferHexStringToInt(String str, int base, int offset) {
+        return Integer.parseInt(str.substring(base, offset), 16);
+
+    }
+}