com.gradleware.tooling.testing.GradleVersionExtractor.java Source code

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Here is the source code for com.gradleware.tooling.testing.GradleVersionExtractor.java

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/*
 * Copyright 2015 the original author or authors.
 *
 * 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 com.gradleware.tooling.testing;

import com.google.common.base.Optional;
import com.google.common.base.Preconditions;

import java.net.URI;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * Extracts the Gradle version from a given object, typically from a URI string.
 *
 * @author Etienne Studer
 */
public final class GradleVersionExtractor {

    // matches the version part of a Gradle distribution location, for example:
    // https://services.gradle.org/distributions/gradle-2.2-20141018225750+0000-bin.zip
    // https://services.gradle.org/distributions/gradle-2.2.1-rc-1-bin.zip
    // https://services.gradle.org/distributions/gradle-2.2.1-bin.zip
    private static final Pattern PATTERN = Pattern.compile("(\\d+\\.\\d+[\\.\\-\\+\\w]*)\\-bin\\.zip");

    private GradleVersionExtractor() {
    }

    /**
     * Returns the Gradle version referenced by the given distribution location.
     *
     * @param uri the distribution location
     * @return the Gradle version of the distribution
     */
    public static Optional<String> getVersion(URI uri) {
        Preconditions.checkNotNull(uri);

        Matcher m = PATTERN.matcher(uri.toString());
        if (m.find()) {
            return Optional.of(m.group(1));
        } else {
            return Optional.absent();
        }
    }

}