/*
 * Copyright (c) 2017-2018 The Regents of the University of California
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 * 1. Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package edu.berkeley.cs.jqf.examples.common;

import java.io.IOException;
import java.io.InputStream;

import com.pholser.junit.quickcheck.generator.GenerationStatus;
import com.pholser.junit.quickcheck.generator.Generator;
import com.pholser.junit.quickcheck.generator.Size;
import com.pholser.junit.quickcheck.random.SourceOfRandomness;
import edu.berkeley.cs.jqf.fuzz.junit.quickcheck.InputStreamGenerator;

/**
 * @author Rohan Padhye
 */
public class ArbitraryLengthStringGenerator extends Generator<String> {

    private int maxSize = 4096;

    public ArbitraryLengthStringGenerator() {
        super(String.class);
    }

    public void configure(Size size) {
        maxSize = size.max();
    }


    @Override
    public String generate(SourceOfRandomness sourceOfRandomness, GenerationStatus generationStatus) {
        InputStream in = new InputStreamGenerator().generate(sourceOfRandomness, generationStatus);
        byte[] bytes = new byte[maxSize];
        try {
            int len = in.read(bytes);
            if (len <= 0) {
                return "";
            } else {
                return new String(bytes, 0, len);
            }
        } catch (IOException e) {
            throw new RuntimeException("Should not get I/O exception when using generated InputStream", e);
        }

    }
}
