/*

 * Copyright (c) 2003, 2019, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

/* @test

 * @bug 4812591 4705328 5019111 8218228

 * @summary Test append and insert methods with CharSequence params

 * @key randomness

 */

import java.util.Random;

public class AppendCharSequence {

    private static Random generator = new Random();

    public static void main(String[] args) throws Exception {

        bash();

        checkNulls();

        checkOffsets();

        checkConstructor();

    }

    // Sanity test of contents

    private static void bash() throws Exception {

        for (int i=0; i<1000; i++) {

            StringBuffer sb1 = generateTestBuffer(0, 100);

            StringBuffer sb2 = generateTestBuffer(0, 100);

            StringBuffer sb3 = generateTestBuffer(0, 100);

            StringBuffer sb4 = generateTestBuffer(0, 100);

            StringBuffer sb5 = new StringBuffer();

            String s1 = sb1.toString();

            String s2 = sb2.toString();

            String s3 = sb3.toString();

            String s4 = sb4.toString();

            String s5 = null;

            // append(CharSequence cs)

            sb5.append((CharSequence)sb1);

            s5 = sb1.toString();

            if (!sb5.toString().equals(s5))

                throw new RuntimeException("StringBuffer.append failure 1");

            // append (CharSequence cs, int start, int end)

            int index = generator.nextInt(100);

            int len = generator.nextInt(100);

            while (index > sb2.length() - len) {

                index = generator.nextInt(100);

                len = generator.nextInt(100);

            }

            sb5.append((CharSequence)sb2, index, index + len);

            s5 = s5 + sb2.toString().substring(index, index + len);

            if (!sb5.toString().equals(s5))

                throw new RuntimeException("StringBuffer.append failure 2");

            // insert(int dstOffset, CharSequence cs)

            index = generator.nextInt(100);

            while (index > s5.length()) {

                index = generator.nextInt(100);

            }

            sb5.insert(index, (CharSequence)sb3);

            s5 = new StringBuffer(s5).insert(index, sb3).toString();

            if (!sb5.toString().equals(s5))

                throw new RuntimeException("StringBuffer.insert failure 1");

            // insert(int dstOffset, CharSequence s, int start, int end)

            int index1 = generator.nextInt(100);

            while (index1 > s5.length()) {

                index1 = generator.nextInt(100);

            }

            int index2 = generator.nextInt(100);

            len = generator.nextInt(100);

            while (index2 > sb4.length() - len) {

                index2 = generator.nextInt(100);

                len = generator.nextInt(100);

            }

            sb5.insert(index1, (CharSequence)sb4, index2, index2 + len);

            s5 = new StringBuffer(s5).insert(index1, s4.toCharArray(),

                                             index2, len).toString();

            if (!sb5.toString().equals(s5))

                throw new RuntimeException("StringBuffer.insert failure 2");

        }

    }

    private static int getRandomIndex(int constraint1, int constraint2) {

        int range = constraint2 - constraint1;

        int x = generator.nextInt(range);

        return constraint1 + x;

    }

    private static StringBuffer generateTestBuffer(int min, int max) {

        StringBuffer aNewStringBuffer = new StringBuffer();

        int aNewLength = getRandomIndex(min, max);

        for(int y=0; y<aNewLength; y++) {

            int achar = generator.nextInt(30)+30;

            char test = (char)(achar);

            aNewStringBuffer.append(test);

        }

        return aNewStringBuffer;

    }

    // Check handling of null as "null"

    private static void checkNulls() throws Exception {

        StringBuffer sb1 = new StringBuffer();

        CharSequence cs = null;

        sb1.append("test");

        sb1.append(cs);

        if (!sb1.toString().equals("testnull"))

            throw new RuntimeException("StringBuffer.append failure 3");

        sb1 = new StringBuffer();

        sb1.append("test", 0, 2);

        sb1.append(cs, 0, 2);

        if (!sb1.toString().equals("tenu"))

            throw new RuntimeException("StringBuffer.append failure 4");

        sb1 = new StringBuffer("test");

        sb1.insert(2, cs);

        if (!sb1.toString().equals("tenullst"))

            throw new RuntimeException("StringBuffer.insert failure 3");

        sb1 = new StringBuffer("test");

        sb1.insert(2, cs, 0, 2);

        if (!sb1.toString().equals("tenust"))

            throw new RuntimeException("StringBuffer.insert failure 4");

    }

    // Test the bounds checking

    private static void checkOffsets() throws Exception {

        // append (CharSeqeunce cs, int start, int end)

        for (int i=0; i<100; i++) {

            StringBuffer sb = generateTestBuffer(0, 80);

            CharSequence cs = (CharSequence)generateTestBuffer(0, 80);

            int index = 0;

            int len = 0;

            while (index <= cs.length() - len) {

                index = generator.nextInt(100) - 50;

                len = generator.nextInt(100) - 50;

                if (index < 0)

                    break;

                if (len < 0)

                    break;

            }

            try {

                sb.append(cs, index, index + len);

                throw new RuntimeException("Append bounds checking failure");

            } catch (IndexOutOfBoundsException e) {

                // Correct result

            }

        }

        // insert(int dstOffset, CharSequence cs)

        for (int i=0; i<100; i++) {

            StringBuffer sb = new StringBuffer("test1");

            CharSequence cs = (CharSequence)new StringBuffer("test2");

            int index = 0;

            while (index <= sb.length()) {

                index = generator.nextInt(100) - 50;

                if (index < 0)

                    break;

            }

            try {

                sb.insert(index, cs);

                throw new RuntimeException("Insert bounds checking failure");

            } catch (IndexOutOfBoundsException e) {

                // Correct result

            }

        }

        // insert(int dstOffset, CharSequence s, int start, int end)

        for (int i=0; i<100; i++) {

            StringBuffer sb = new StringBuffer("test1");

            CharSequence cs = (CharSequence)new StringBuffer("test2");

            int index1 = 0;

            while (index1 <= sb.length()) {

                index1 = generator.nextInt(100) - 50;

                if (index1 < 0)

                    break;

            }

            int index2 = 0;

            int len = 0;

            while (index2 < sb.length() - len) {

                index2 = generator.nextInt(100) - 50;

                len = generator.nextInt(100) - 50;

                if (index2 < 0)

                    break;

                if (len < 0)

                    break;

            }

            try {

                sb.insert(index1, cs, index2, index2 + len);

                throw new RuntimeException("Insert bounds checking failure");

            } catch (IndexOutOfBoundsException e) {

                // Correct result

            }

        }

    }

    // Test the CharSequence constructor

    private static void checkConstructor() throws Exception {

        for (int i=0; i<100; i++) {

            StringBuffer sb = generateTestBuffer(0, 100);

            CharSequence cs = (CharSequence)sb;

            StringBuffer sb2 = new StringBuffer(cs);

            if (!sb.toString().equals(sb2.toString())) {

                throw new RuntimeException("CharSequence constructor failure");

            }

        }

        checkNegativeLenCharSeq(-1);

        checkNegativeLenCharSeq(-16);

        checkNegativeLenCharSeq(-17);

        checkNegativeLenCharSeq(Integer.MIN_VALUE);

    }

    // Test constructing from CharSequence of negative length

    private static void checkNegativeLenCharSeq(int len) {

        try {

            CharSequence seq = new MyNegativeLenCharSeq(len);

            StringBuffer sb = new StringBuffer(seq);

        } catch (NegativeArraySizeException expected) {

        } catch (Throwable exc) {

            throw new RuntimeException("Unexpected: " + exc, exc);

        }

    }

    private static class MyNegativeLenCharSeq implements CharSequence {

        int length;

        MyNegativeLenCharSeq(int length) {

            this.length = length;

        }

        public char charAt(int i) {

            throw new UnsupportedOperationException();

        }

        public int length() { return length; }

        public CharSequence subSequence(int st, int e) {

            throw new UnsupportedOperationException();

        }

        public String toString() { return ""; }

    }

}