| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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.codehaus.groovy.runtime; |
| |
| /** |
| * Utilities for handling array types |
| */ |
| public class ArrayTypeUtils { |
| |
| /** |
| * Calculate the dimension of array |
| * |
| * @param clazz the type of array |
| * @return the dimension of array |
| */ |
| public static int dimension(Class clazz) { |
| checkArrayType(clazz); |
| |
| int result = 0; |
| while (clazz.isArray()) { |
| result++; |
| clazz = clazz.getComponentType(); |
| } |
| |
| return result; |
| } |
| |
| /** |
| * Get the type of array elements |
| * |
| * @param clazz the type of array |
| * @return the type of elements |
| */ |
| public static Class elementType(Class clazz) { |
| checkArrayType(clazz); |
| |
| while (clazz.isArray()) { |
| clazz = clazz.getComponentType(); |
| } |
| |
| return clazz; |
| } |
| |
| /** |
| * Get the type of array elements by the dimension |
| * |
| * @param clazz the type of array |
| * @param dim the target dimension |
| * @return the result array |
| */ |
| public static Class elementType(Class clazz, int dim) { |
| checkArrayType(clazz); |
| |
| if (dim < 0) { |
| throw new IllegalArgumentException("The target dimension should not be less than zero: " + dim); |
| } |
| |
| while (clazz.isArray() && dimension(clazz) > dim) { |
| clazz = clazz.getComponentType(); |
| } |
| |
| return clazz; |
| } |
| |
| /** |
| * Check whether the type passed in is array type. |
| * If the type is not array type, throw IllegalArgumentException. |
| */ |
| private static void checkArrayType(Class clazz) { |
| if (null == clazz) { |
| throw new IllegalArgumentException("clazz can not be null"); |
| } |
| |
| if (!clazz.isArray()) { |
| throw new IllegalArgumentException(clazz.getCanonicalName() + " is not array type"); |
| } |
| } |
| } |