io.wcm.devops.maven.nodejsproxy.resource.Checksums.java Source code

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Here is the source code for io.wcm.devops.maven.nodejsproxy.resource.Checksums.java

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/*
 * #%L
 * wcm.io
 * %%
 * Copyright (C) 2015 wcm.io
 * %%
 * 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.
 * #L%
 */
package io.wcm.devops.maven.nodejsproxy.resource;

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

import org.apache.commons.lang3.StringUtils;

/**
 * Parses checksums file
 */
public class Checksums {

    private final Map<String, String> checksums = new HashMap<>();

    private static final Pattern LEVEL_1_RELATIVE_NAME = Pattern.compile("^.*/([^/]+)$");
    private static final Pattern LEVEL_2_RELATIVE_NAME = Pattern.compile("^.*/([^/]+/[^/]+)$");

    /**
     * @param data Checksums file content
     */
    public Checksums(String data) {
        String[] lines = StringUtils.split(data, "\n");
        for (String line : lines) {
            String checksum = StringUtils.substringBefore(line, "  ");
            String filename = StringUtils.substringAfter(line, "  ");
            if (StringUtils.isNoneBlank(checksum, filename)) {
                checksums.put(filename, checksum);
            }
        }
    }

    /**
     * Get checksum
     * @param filename File URL. the filename and filename including last directory level is checked.
     * @return Checksum or null
     */
    public String get(String filename) {
        // try 2nd level first
        String checksum = get(filename, LEVEL_2_RELATIVE_NAME);
        if (checksum != null) {
            return checksum;
        }
        // then 1st level
        return get(filename, LEVEL_1_RELATIVE_NAME);
    }

    private String get(String filename, Pattern pattern) {
        Matcher matcher = pattern.matcher(filename);
        if (matcher.matches()) {
            String relativeFilename = matcher.group(1);
            return checksums.get(relativeFilename);
        }
        return null;
    }

}