add helpers for J1939 CAN ID parsing

core-test/src/test/java/tel/schich/javacan/test/J1939UtilsTest.java

@@ -0,0 +1,47 @@
+/*
+ * The MIT License
+ * Copyright © 2018 Phillip Schichtel
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+package tel.schich.javacan.test;
+
+import org.junit.jupiter.api.Test;
+import tel.schich.javacan.J1939Utils;
+
+import static java.lang.Integer.toHexString;
+import static org.junit.jupiter.api.Assertions.*;
+
+class J1939UtilsTest {
+
+    @Test
+    void parameterGroupNumberFromRawAddress() {
+        assertEquals(toHexString(0xEFA1), toHexString(J1939Utils.parameterGroupNumberFromRawAddress(0x18EFA1EB)));
+    }
+
+    @Test
+    void sourceAddressFromRawAddress() {
+        assertEquals(toHexString((byte)0xEB), toHexString(J1939Utils.sourceAddressFromRawAddress(0x18EFA1EB)));
+    }
+
+    @Test
+    void priorityFromRawAddress() {
+        assertEquals(6, J1939Utils.priorityFromRawAddress(0x18EFA1EB));
+    }
+}

core/src/main/java/tel/schich/javacan/J1939Address.java

@@ -36,4 +36,8 @@ public interface J1939Address {
     byte getAddress();
 
     ImmutableJ1939Address copy();
+
+    static ImmutableJ1939Address of(NetworkDevice device, long name, int parameterGroupNumber, byte address) {
+        return new ImmutableJ1939Address(device, name, parameterGroupNumber, address);
+    }
 }

core/src/main/java/tel/schich/javacan/J1939Utils.java

@@ -0,0 +1,40 @@
+/*
+ * The MIT License
+ * Copyright © 2018 Phillip Schichtel
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+package tel.schich.javacan;
+
+public class J1939Utils {
+    private J1939Utils() {
+    }
+
+    public static int parameterGroupNumberFromRawAddress(int canId) {
+        return (canId >>> 8) & 0b0011_1111_1111_1111_1111;
+    }
+
+    public static byte sourceAddressFromRawAddress(int canId) {
+        return (byte)(canId & 0b1111_1111);
+    }
+
+    public static byte priorityFromRawAddress(int canId) {
+        return (byte)((canId >>> 26) & 0b0111);
+    }
+}