import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;

import com.mindprod.fastcat.FastCat;

public class CatTester {
    private interface Tester {
        public int test(final long junk);
    }

    private static class TestFastCat implements Tester {
        private final FastCat   sb;

        public TestFastCat(final FastCat sb) {
            this.sb = sb;
        }

        @Override
        public int test(final long junk) {
            final FastCat sbLocal = sb == null ? new FastCat() : sb;
            final int start = sbLocal.length();
            //          sbLocal.append("abcdef");
            //          sbLocal.append(1234);
            //          sbLocal.append("xvckxjcvh");
            //          sbLocal.append(junk);
            //          sbLocal.append("xvckxjcvh");
            //          sbLocal.append(junk + 1);
            sbLocal.append("abcdef", 1234, "xvckxjcvh", junk, "xvckxjcvh", junk + 1);
            return sbLocal.length() - start;
        }
    }

    private static class TestStringBuffer implements Tester {
        private final StringBuffer  sb;

        public TestStringBuffer(final StringBuffer sb) {
            this.sb = sb;
        }

        @Override
        public int test(final long junk) {
            final StringBuffer sbLocal = sb == null ? new StringBuffer() : sb;
            final int start = sbLocal.length();
            sbLocal.append("abcdef");
            sbLocal.append(1234);
            sbLocal.append("xvckxjcvh");
            sbLocal.append(junk);
            sbLocal.append("xvckxjcvh");
            sbLocal.append(junk + 1);
            return sbLocal.length() - start;
        }
    }

    private static class TestStringBuilder implements Tester {
        private final StringBuilder sb;

        public TestStringBuilder(final StringBuilder sb) {
            this.sb = sb;
        }

        @Override
        public int test(final long junk) {
            final StringBuilder sbLocal = sb == null ? new StringBuilder() : sb;
            final int start = sbLocal.length();
            sbLocal.append("abcdef");
            sbLocal.append(1234);
            sbLocal.append("xvckxjcvh");
            sbLocal.append(junk);
            sbLocal.append("xvckxjcvh");
            sbLocal.append(junk + 1);
            return sbLocal.length() - start;
        }
    }

    public static void main(final String[] args) {
        new CatTester().test();
    }

    private final DateFormat    DF  = new SimpleDateFormat("mm':'ss'.'SSS'ms'");

    private void loopTest(final String name, final Tester tester, final int loops) {
        final long start = System.currentTimeMillis();
        long junk = 0;
        for (int i = 1; i < loops; i++) {
            junk += tester.test(junk);
        }
        if (name != null) {
            System.out.println(String.format("Took %s to append %,d chars total with %s.", timestamp(start), junk, name));
        }
    }

    private void test() {
        final int loops = 10000000;

        // To warm up the VM, HotSpot etc
        loopTest(null, new TestStringBuilder(null), loops);
        loopTest(null, new TestStringBuffer(null), loops);
        loopTest(null, new TestFastCat(null), loops);

        System.out.println("Fresh SB/FCs:");
        loopTest("FastCat", new TestFastCat(null), loops);
        loopTest("StringBuffer", new TestStringBuffer(null), loops);
        loopTest("StringBuilder", new TestStringBuilder(null), loops);

        System.out.println("Reused SB/FCs:");
        loopTest("FastCat", new TestFastCat(new FastCat(loops * 20)), loops);
        loopTest("StringBuffer", new TestStringBuffer(new StringBuffer(loops * 20)), loops);
        loopTest("StringBuilder", new TestStringBuilder(new StringBuilder(loops * 20)), loops);
    }

    private String timestamp(final long start) {
        return DF.format(new Date(System.currentTimeMillis() - start));
    }
}