001/*
002 * Licensed to the author under one or more
003 * contributor license agreements. See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License. You may obtain a copy of the License at
008 *
009 * http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package de.cuioss.test.generator.internal.net.java.quickcheck.generator.support;
018
019import java.lang.reflect.Array;
020import java.util.List;
021import java.util.Objects;
022
023import de.cuioss.test.generator.internal.net.java.quickcheck.Generator;
024
025public class ArrayGenerator<T> extends
026        AbstractTransformerGenerator<List<T>, T[]> {
027
028    public static final int MAX_SIZE = ListGenerator.MAX_SIZE;
029    public static final int MIN_SIZE = ListGenerator.MIN_SIZE;
030
031    private T[] emptyArrayOfT;
032
033    public ArrayGenerator(Generator<? extends T> content, Class<T> type) {
034        super(new ListGenerator<>(content));
035        setEmptyArrayOfT(type);
036    }
037
038    public ArrayGenerator(Generator<? extends T> content, Generator<Integer> size,
039            Class<T> type) {
040        super(new ListGenerator<>(content, size));
041        setEmptyArrayOfT(type);
042    }
043
044    private void setEmptyArrayOfT(Class<T> type) {
045        Objects.requireNonNull(type, "content type");
046        this.emptyArrayOfT = emptyArrayOfT(type);
047    }
048
049    @Override
050    protected T[] transform(Generator<List<T>> inputGenerator) {
051        return inputGenerator.next().toArray(emptyArrayOfT);
052    }
053
054    @SuppressWarnings("unchecked")
055    private T[] emptyArrayOfT(Class<T> type) {
056        return (T[]) Array.newInstance(type, 0);
057    }
058}