1 files changed, 108 insertions, 0 deletions
diff --git a/src/org/traccar/helper/Clazz.java b/src/org/traccar/helper/Clazz.java
new file mode 100644
index 000000000..ba4c4fded
--- /dev/null
+++ b/src/org/traccar/helper/Clazz.java
@@ -0,0 +1,108 @@
+/*
+ * 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 java.beans.Introspector;
+import java.io.Serializable;
+import java.lang.reflect.Method;
+import java.lang.reflect.ParameterizedType;
+import java.lang.reflect.Type;
+
+public final class Clazz implements Serializable {
+
+    private static final long serialVersionUID = 4983299355055144885L;
+
+    private Clazz() {
+    }
+
+    public static Class getGenericArgumentType(Class currentClass, Class genericSuperClass) {
+        return getGenericArgumentType(currentClass, genericSuperClass, 0);
+    }
+
+    public static Class getGenericArgumentType(Class currentClass, int argumentIndex) {
+        return getGenericArgumentType(currentClass, null, argumentIndex);
+    }
+
+    public static Class getGenericArgumentType(Class currentClass) {
+        return getGenericArgumentType(currentClass, null, 0);
+    }
+
+    public static Class getGenericArgumentType(Class currentClass, Class genericSuperClass, int argumentIndex) {
+        Type superType = currentClass.getGenericSuperclass();
+        if (superType == null) {
+            throw new IllegalArgumentException();
+        }
+        if (!(superType instanceof ParameterizedType)
+                || genericSuperClass != null
+                && ((ParameterizedType) superType).getRawType() != genericSuperClass) {
+            return getGenericArgumentType(currentClass.getSuperclass(), genericSuperClass, argumentIndex);
+        }
+        Object[] args = ((ParameterizedType) superType).getActualTypeArguments();
+        if (argumentIndex >= args.length) {
+            throw new IllegalArgumentException();
+        }
+        return cast(Class.class, args[argumentIndex]);
+    }
+
+    public static <T> T newInstance(Class<T> clazz) {
+        try {
+            return clazz.newInstance();
+        } catch (InstantiationException | IllegalAccessException e) {
+            throw new IllegalArgumentException();
+        }
+    }
+
+    public static <T> T cast(Class<T> classe, Object objeto) {
+        if (classe.isAssignableFrom(objeto.getClass())) {
+            return classe.cast(objeto);
+        }
+        throw new ClassCastException();
+    }
+
+    public static Class forName(String className) {
+        try {
+            return Class.forName(className, false, Thread.currentThread().getContextClassLoader());
+        } catch (ClassNotFoundException e) {
+            throw new IllegalArgumentException(e);
+        }
+    }
+
+    public static <T> long getId(T entity) throws Exception {
+        Method[] methods = entity.getClass().getMethods();
+        for (final Method method : methods) {
+            if (method.getName().startsWith("get") && method.getParameterTypes().length == 0) {
+                final String name = Introspector.decapitalize(method.getName().substring(3));
+                if (name.equals("id")) {
+                    return Long.parseLong(method.invoke(entity).toString());
+                }
+            }
+        }
+        throw new IllegalArgumentException();
+    }
+
+    public static <T, I> void setId(T entity, I id) throws Exception {
+        Method[] methods = entity.getClass().getMethods();
+        for (final Method method : methods) {
+            if (method.getName().startsWith("set") && method.getParameterTypes().length == 1) {
+                final String name = Introspector.decapitalize(method.getName().substring(3));
+                if (name.equals("id")) {
+                    method.invoke(entity, id);
+                    break;
+                }
+            }
+        }
+    }
+}