/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.apache.maven.shared.jar.identification.exposers;

import javax.inject.Named;
import javax.inject.Singleton;

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

import org.apache.maven.shared.jar.JarAnalyzer;
import org.apache.maven.shared.jar.identification.JarIdentification;
import org.apache.maven.shared.jar.identification.JarIdentificationExposer;
import org.codehaus.plexus.util.FileUtils;

/**
 * Exposer that examines a JAR file to derive Maven metadata from the pattern of the JAR's filename.
 * Will match the format <i>artifactId</i>-<i>version</i>.jar.
 */
@Singleton
@Named("filename")
public class FilenameExposer implements JarIdentificationExposer {
    private static final Pattern VERSION_PATTERN = Pattern.compile("-\\d");

    @Override
    public void expose(JarIdentification identification, JarAnalyzer jarAnalyzer) {
        String filename = FileUtils.removeExtension(jarAnalyzer.getFile().getName());
        Matcher mat = VERSION_PATTERN.matcher(filename);
        if (mat.find()) {
            String prefix = filename.substring(0, mat.start());
            identification.addArtifactId(prefix);
            identification.addName(prefix);
            identification.addVersion(filename.substring(mat.end() - 1));
        } else {
            identification.addArtifactId(filename);
            identification.addName(filename);
        }
    }
}
