benchmarks/regression/SchemePrefixBenchmark.java

/*
 * Copyright (C) 2011 Google Inc.
 *
 * Licensed 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 benchmarks.regression;

import com.google.caliper.Param;
import com.google.caliper.SimpleBenchmark;
import java.util.Locale;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public final class SchemePrefixBenchmark extends SimpleBenchmark {

    enum Strategy {
        JAVA() {
            @Override String execute(String spec) {
                int colon = spec.indexOf(':');

                if (colon < 1) {
                    return null;
                }

                for (int i = 0; i < colon; i++) {
                    char c = spec.charAt(i);
                    if (!isValidSchemeChar(i, c)) {
                        return null;
                    }
                }

                return spec.substring(0, colon).toLowerCase(Locale.US);
            }

            private boolean isValidSchemeChar(int index, char c) {
                if ((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z')) {
                    return true;
                }
                if (index > 0 && ((c >= '0' && c <= '9') || c == '+' || c == '-' || c == '.')) {
                    return true;
                }
                return false;
            }
        },

        REGEX() {
            private final Pattern pattern = Pattern.compile("^([a-zA-Z][a-zA-Z0-9+\\-.]*):");

            @Override String execute(String spec) {
                Matcher matcher = pattern.matcher(spec);
                if (matcher.find()) {
                    return matcher.group(1).toLowerCase(Locale.US);
                } else {
                    return null;
                }
            }
        };


        abstract String execute(String spec);
    }

    @Param Strategy strategy;

    public void timeSchemePrefix(int reps) {
        for (int i = 0; i < reps; i++) {
            strategy.execute("http://android.com");
        }
    }
}