| /******************************************************************************* |
| * 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.ofbiz.base.util; |
| |
| import java.util.Collection; |
| import java.util.LinkedHashMap; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.Set; |
| import java.util.Stack; |
| |
| public class UtilGenerics { |
| |
| public static final String module = UtilMisc.class.getName(); |
| |
| @SuppressWarnings("unchecked") |
| public static <V> V cast(Object object) { |
| return (V) object; |
| } |
| |
| private static <C extends Collection<?>> C checkCollectionCast(Object object, Class<C> clz) { |
| return clz.cast(object); |
| } |
| |
| public static <C extends Collection<?>> void checkCollectionContainment(Object object, Class<C> clz, Class<?> type) { |
| if (object != null) { |
| if (!(clz.isInstance(object))) throw new ClassCastException("Not a " + clz.getName()); |
| int i = 0; |
| for (Object value: (Collection<?>) object) { |
| if (value != null && !type.isInstance(value)) { |
| throw new IllegalArgumentException("Value(" + i + "), with value(" + value + ") is not a " + type.getName()); |
| } |
| i++; |
| } |
| } |
| } |
| |
| @SuppressWarnings("unchecked") |
| public static <T> Collection<T> checkCollection(Object object) { |
| return (Collection<T>) checkCollectionCast(object, Collection.class); |
| } |
| |
| public static <T> Collection<T> checkCollection(Object object, Class<T> type) { |
| checkCollectionContainment(object, Collection.class, type); |
| return checkCollection(object); |
| } |
| |
| @SuppressWarnings("unchecked") |
| public static <T> List<T> checkList(Object object) { |
| return (List<T>) checkCollectionCast(object, List.class); |
| } |
| |
| public static <T> List<T> checkList(Object object, Class<T> type) { |
| checkCollectionContainment(object, List.class, type); |
| return checkList(object); |
| } |
| |
| @SuppressWarnings("unchecked") |
| public static <K, V> Map<K, V> checkMap(Object object) { |
| if (object != null && !(object instanceof Map)) throw new ClassCastException("Not a map"); |
| return (Map<K, V>) object; |
| } |
| |
| public static <K, V> Map<K, V> checkMap(Object object, Class<K> keyType, Class<V> valueType) { |
| if (object != null) { |
| if (!(object instanceof Map<?, ?>)) throw new ClassCastException("Not a map"); |
| Map<?, ?> map = (Map<?,?>) object; |
| int i = 0; |
| for (Map.Entry<?, ?> entry: map.entrySet()) { |
| if (entry.getKey() != null && !keyType.isInstance(entry.getKey())) { |
| throw new IllegalArgumentException("Key(" + i + "), with value(" + entry.getKey() + ") is not a " + keyType); |
| } |
| if (entry.getValue() != null && !valueType.isInstance(entry.getValue())) { |
| throw new IllegalArgumentException("Value(" + i + "), with value(" + entry.getValue() + ") is not a " + valueType); |
| } |
| i++; |
| } |
| } |
| return checkMap(object); |
| } |
| |
| @SuppressWarnings("unchecked") |
| public static <T> Stack<T> checkStack(Object object) { |
| return (Stack<T>) checkCollectionCast(object, Stack.class); |
| } |
| |
| public static <T> Stack<T> checkStack(Object object, Class<T> type) { |
| checkCollectionContainment(object, Stack.class, type); |
| return checkStack(object); |
| } |
| |
| @SuppressWarnings("unchecked") |
| public static <T> Set<T> checkSet(Object object) { |
| return (Set<T>) checkCollectionCast(object, Set.class); |
| } |
| |
| public static <T> Set<T> checkSet(Object object, Class<T> type) { |
| checkCollectionContainment(object, Set.class, type); |
| return checkSet(object); |
| } |
| |
| /** Returns the Object argument as a parameterized List if the Object argument |
| * is an instance of List. Otherwise returns null. |
| */ |
| @SuppressWarnings("unchecked") |
| public static <T> List<T> toList(Object object) { |
| if (object != null && !(object instanceof List)) return null; |
| return (List<T>) object; |
| } |
| |
| /** Returns the Object argument as a parameterized Map if the Object argument |
| * is an instance of Map. Otherwise returns null. |
| */ |
| @SuppressWarnings("unchecked") |
| public static <K, V> Map<K, V> toMap(Object object) { |
| if (object != null && !(object instanceof Map)) return null; |
| return (Map<K, V>) object; |
| } |
| |
| public static <K, V> Map<K, V> toMap(Class<K> keyType, Class<V> valueType, Object... data) { |
| if (data == null) { |
| return null; |
| } |
| if (data.length % 2 == 1) { |
| throw new IllegalArgumentException("You must pass an even sized array to the toMap method"); |
| } |
| Map<K, V> map = new LinkedHashMap<K, V>(); |
| for (int i = 0; i < data.length;) { |
| Object key = data[i]; |
| if (key != null && !(keyType.isInstance(key))) throw new IllegalArgumentException("Key(" + i + ") is not a " + keyType.getName() + ", was(" + key.getClass().getName() + ")"); |
| i++; |
| Object value = data[i]; |
| if (value != null && !(valueType.isInstance(value))) throw new IllegalArgumentException("Value(" + i + ") is not a " + keyType.getName() + ", was(" + key.getClass().getName() + ")"); |
| i++; |
| map.put(keyType.cast(key), valueType.cast(value)); |
| } |
| return map; |
| } |
| |
| @SuppressWarnings("hiding") |
| public static <K, Object> Map<K, Object> toMap(Class<K> keyType, Object... data) { |
| if (data == null) { |
| return null; |
| } |
| if (data.length % 2 == 1) { |
| throw new IllegalArgumentException("You must pass an even sized array to the toMap method"); |
| } |
| Map<K, Object> map = new LinkedHashMap<K, Object>(); |
| for (int i = 0; i < data.length;) { |
| Object key = data[i]; |
| if (key != null && !(keyType.isInstance(key))) throw new IllegalArgumentException("Key(" + i + ") is not a " + keyType.getName() + ", was(" + key.getClass().getName() + ")"); |
| i++; |
| Object value = data[i]; |
| map.put(keyType.cast(key), value); |
| } |
| return map; |
| } |
| } |