aboutsummaryrefslogtreecommitdiff
path: root/src/org/traccar/helper/Clazz.java
diff options
context:
space:
mode:
Diffstat (limited to 'src/org/traccar/helper/Clazz.java')
-rw-r--r--src/org/traccar/helper/Clazz.java108
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;
+ }
+ }
+ }
+ }
+}