/
Utils.java
54 lines (49 loc) · 1.78 KB
/
Utils.java
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/*
* 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.apache.maven.internal.impl;
import java.util.Collection;
import java.util.List;
import java.util.function.Function;
import java.util.stream.Collectors;
class Utils {
static <T> T nonNull(T t) {
if (t == null) {
throw new IllegalArgumentException();
}
return t;
}
static <T> T nonNull(T t, String name) {
if (t == null) {
throw new IllegalArgumentException(name + " cannot be null");
}
return t;
}
static <T> T cast(Class<T> clazz, Object o, String name) {
if (!clazz.isInstance(o)) {
if (o == null) {
throw new IllegalArgumentException(name + " is null");
}
throw new IllegalArgumentException(name + " is not an instance of " + clazz.getName());
}
return clazz.cast(o);
}
static <U, V> List<V> map(Collection<U> list, Function<U, V> mapper) {
return list.stream().map(mapper).collect(Collectors.toList());
}
}