/*
    * This file is part of dependency-check-core.
    *
    * 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.
   *
   * Copyright (c) 2012 Jeremy Long. All Rights Reserved.
   */
  package org.owasp.dependencycheck.analyzer;
  
  import com.github.packageurl.MalformedPackageURLException;
  import org.semver4j.Semver;
  import org.semver4j.SemverException;
  import java.io.File;
  import java.util.Set;
  import java.util.regex.Matcher;
  import java.util.regex.Pattern;
  import static java.util.stream.Collectors.toSet;
  import javax.annotation.concurrent.ThreadSafe;
  import org.owasp.dependencycheck.dependency.Dependency;
  import org.owasp.dependencycheck.dependency.Vulnerability;
  import org.owasp.dependencycheck.dependency.naming.Identifier;
  import org.owasp.dependencycheck.dependency.naming.PurlIdentifier;
  import org.owasp.dependencycheck.utils.DependencyVersion;
  import org.owasp.dependencycheck.utils.DependencyVersionUtil;
  import org.owasp.dependencycheck.utils.Settings;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * <p>
   * This analyzer ensures dependencies that should be grouped together, to remove
   * excess noise from the report, are grouped. An example would be Spring, Spring
   * Beans, Spring MVC, etc. If they are all for the same version and have the
   * same relative path then these should be grouped into a single dependency
   * under the core/main library.</p>
   * <p>
   * Note, this grouping only works on dependencies with identified CVE
   * entries</p>
   *
   * @author Jeremy Long
   */
  @ThreadSafe
  public class DependencyBundlingAnalyzer extends AbstractDependencyComparingAnalyzer {
  
      /**
       * The Logger.
       */
      private static final Logger LOGGER = LoggerFactory.getLogger(DependencyBundlingAnalyzer.class);
  
      /**
       * A pattern for obtaining the first part of a filename.
       */
      private static final Pattern STARTING_TEXT_PATTERN = Pattern.compile("^[a-zA-Z0-9]*");
  
      /**
       * The name of the analyzer.
       */
      private static final String ANALYZER_NAME = "Dependency Bundling Analyzer";
      /**
       * The phase that this analyzer is intended to run in.
       */
      private static final AnalysisPhase ANALYSIS_PHASE = AnalysisPhase.FINAL;
  
      /**
       * Returns the name of the analyzer.
       *
       * @return the name of the analyzer.
       */
      @Override
      public String getName() {
          return ANALYZER_NAME;
      }
  
      /**
       * Returns the phase that the analyzer is intended to run in.
       *
       * @return the phase that the analyzer is intended to run in.
       */
      @Override
      public AnalysisPhase getAnalysisPhase() {
          return ANALYSIS_PHASE;
      }
  
      /**
       * <p>
       * Returns the setting key to determine if the analyzer is enabled.</p>
       *
       * @return the key for the analyzer's enabled property
       */
     @Override
     protected String getAnalyzerEnabledSettingKey() {
         return Settings.KEYS.ANALYZER_DEPENDENCY_BUNDLING_ENABLED;
     }
 
     /**
      * Evaluates the dependencies
      *
      * @param dependency a dependency to compare
      * @param nextDependency a dependency to compare
      * @param dependenciesToRemove a set of dependencies that will be removed
      * @return true if a dependency is removed; otherwise false
      */
     @Override
     protected boolean evaluateDependencies(final Dependency dependency, final Dependency nextDependency, final Set<Dependency> dependenciesToRemove) {
         if (hashesMatch(dependency, nextDependency)) {
             if (!containedInWar(dependency.getFilePath())
                     && !containedInWar(nextDependency.getFilePath())) {
                 if (firstPathIsShortest(dependency.getFilePath(), nextDependency.getFilePath())) {
                     mergeDependencies(dependency, nextDependency, dependenciesToRemove);
                 } else {
                     mergeDependencies(nextDependency, dependency, dependenciesToRemove);
                     return true; //since we merged into the next dependency - skip forward to the next in mainIterator
                 }
             }
         } else if (isShadedJar(dependency, nextDependency)) {
             if (dependency.getFileName().toLowerCase().endsWith("pom.xml")) {
                 mergeDependencies(nextDependency, dependency, dependenciesToRemove);
                 nextDependency.removeRelatedDependencies(dependency);
                 return true;
             } else {
                 mergeDependencies(dependency, nextDependency, dependenciesToRemove);
                 dependency.removeRelatedDependencies(nextDependency);
             }
         } else if (isWebJar(dependency, nextDependency)) {
             if (dependency.getFileName().toLowerCase().endsWith(".js")) {
                 mergeDependencies(nextDependency, dependency, dependenciesToRemove, true);
                 nextDependency.removeRelatedDependencies(dependency);
                 return true;
             } else {
                 mergeDependencies(dependency, nextDependency, dependenciesToRemove, true);
                 dependency.removeRelatedDependencies(nextDependency);
             }
         } else if (cpeIdentifiersMatch(dependency, nextDependency)
                 && hasSameBasePath(dependency, nextDependency)
                 && vulnerabilitiesMatch(dependency, nextDependency)
                 && fileNameMatch(dependency, nextDependency)) {
             if (isCore(dependency, nextDependency)) {
                 mergeDependencies(dependency, nextDependency, dependenciesToRemove);
             } else {
                 mergeDependencies(nextDependency, dependency, dependenciesToRemove);
                 return true; //since we merged into the next dependency - skip forward to the next in mainIterator
             }
         } else if (ecosystemIs(AbstractNpmAnalyzer.NPM_DEPENDENCY_ECOSYSTEM, dependency, nextDependency)
                 && namesAreEqual(dependency, nextDependency)
                 && npmVersionsMatch(dependency.getVersion(), nextDependency.getVersion())) {
 
             if (!dependency.isVirtual()) {
                 DependencyMergingAnalyzer.mergeDependencies(dependency, nextDependency, dependenciesToRemove);
             } else {
                 DependencyMergingAnalyzer.mergeDependencies(nextDependency, dependency, dependenciesToRemove);
                 return true;
             }
         }
         return false;
     }
 
     /**
      * Adds the relatedDependency to the dependency's related dependencies.
      *
      * @param dependency the main dependency
      * @param relatedDependency a collection of dependencies to be removed from
      * the main analysis loop, this is the source of dependencies to remove
      * @param dependenciesToRemove a collection of dependencies that will be
      * removed from the main analysis loop, this function adds to this
      * collection
      */
     public static void mergeDependencies(final Dependency dependency,
             final Dependency relatedDependency, final Set<Dependency> dependenciesToRemove) {
         mergeDependencies(dependency, relatedDependency, dependenciesToRemove, false);
     }
 
     /**
      * Adds the relatedDependency to the dependency's related dependencies.
      *
      * @param dependency the main dependency
      * @param relatedDependency a collection of dependencies to be removed from
      * the main analysis loop, this is the source of dependencies to remove
      * @param dependenciesToRemove a collection of dependencies that will be
      * removed from the main analysis loop, this function adds to this
      * collection
      * @param copyVulnsAndIds whether or not identifiers and vulnerabilities are
      * copied
      */
     public static void mergeDependencies(final Dependency dependency,
             final Dependency relatedDependency, final Set<Dependency> dependenciesToRemove,
             final boolean copyVulnsAndIds) {
         dependency.addRelatedDependency(relatedDependency);
         relatedDependency.getRelatedDependencies()
                 .forEach(dependency::addRelatedDependency);
         relatedDependency.clearRelatedDependencies();
 
         if (copyVulnsAndIds) {
             relatedDependency.getSoftwareIdentifiers()
                     .forEach(dependency::addSoftwareIdentifier);
             relatedDependency.getVulnerableSoftwareIdentifiers()
                     .forEach(dependency::addVulnerableSoftwareIdentifier);
             relatedDependency.getVulnerabilities()
                     .forEach(dependency::addVulnerability);
         }
         //TODO this null check was added for #1296 - but I believe this to be related to virtual dependencies
         //  we may want to merge project references on virtual dependencies...
         if (dependency.getSha1sum() != null && dependency.getSha1sum().equals(relatedDependency.getSha1sum())) {
             dependency.addAllProjectReferences(relatedDependency.getProjectReferences());
             dependency.addAllIncludedBy(relatedDependency.getIncludedBy());
         }
         if (dependenciesToRemove != null) {
             dependenciesToRemove.add(relatedDependency);
         }
     }
 
     /**
      * Attempts to trim a maven repo to a common base path. This is typically
      * [drive]\[repo_location]\repository\[path1]\[path2].
      *
      * @param path the path to trim
      * @param repo the name of the local maven repository
      * @return a string representing the base path.
      */
     private String getBaseRepoPath(final String path, final String repo) {
         int pos = path.indexOf(repo + File.separator) + repo.length() + 1;
         if (pos < repo.length() + 1) {
             return path;
         }
         int tmp = path.indexOf(File.separator, pos);
         if (tmp <= 0) {
             return path;
         }
         pos = tmp + 1;
         tmp = path.indexOf(File.separator, pos);
         if (tmp > 0) {
             pos = tmp + 1;
         }
         return path.substring(0, pos);
     }
 
     /**
      * Returns true if the file names (and version if it exists) of the two
      * dependencies are sufficiently similar.
      *
      * @param dependency1 a dependency2 to compare
      * @param dependency2 a dependency2 to compare
      * @return true if the identifiers in the two supplied dependencies are
      * equal
      */
     private boolean fileNameMatch(Dependency dependency1, Dependency dependency2) {
         if (dependency1 == null || dependency1.getFileName() == null
                 || dependency2 == null || dependency2.getFileName() == null) {
             return false;
         }
         final String fileName1 = dependency1.getActualFile().getName();
         final String fileName2 = dependency2.getActualFile().getName();
 
         //version check
         final DependencyVersion version1 = DependencyVersionUtil.parseVersion(fileName1);
         final DependencyVersion version2 = DependencyVersionUtil.parseVersion(fileName2);
         if (version1 != null && version2 != null && !version1.equals(version2)) {
             return false;
         }
 
         //filename check
         final Matcher match1 = STARTING_TEXT_PATTERN.matcher(fileName1);
         final Matcher match2 = STARTING_TEXT_PATTERN.matcher(fileName2);
         if (match1.find() && match2.find()) {
             return match1.group().equals(match2.group());
         }
 
         return false;
     }
 
     /**
      * Returns true if the CPE identifiers in the two supplied dependencies are
      * equal.
      *
      * @param dependency1 a dependency2 to compare
      * @param dependency2 a dependency2 to compare
      * @return true if the identifiers in the two supplied dependencies are
      * equal
      */
     private boolean cpeIdentifiersMatch(Dependency dependency1, Dependency dependency2) {
         if (dependency1 == null || dependency1.getVulnerableSoftwareIdentifiers() == null
                 || dependency2 == null || dependency2.getVulnerableSoftwareIdentifiers() == null) {
             return false;
         }
         boolean matches = false;
         final int cpeCount1 = dependency1.getVulnerableSoftwareIdentifiers().size();
         final int cpeCount2 = dependency2.getVulnerableSoftwareIdentifiers().size();
         if (cpeCount1 > 0 && cpeCount1 == cpeCount2) {
             for (Identifier i : dependency1.getVulnerableSoftwareIdentifiers()) {
                 matches |= dependency2.getVulnerableSoftwareIdentifiers().contains(i);
                 if (!matches) {
                     break;
                 }
             }
         }
         LOGGER.trace("IdentifiersMatch={} ({}, {})", matches, dependency1.getFileName(), dependency2.getFileName());
         return matches;
     }
 
     /**
      * Returns true if the two dependencies have the same vulnerabilities.
      *
      * @param dependency1 a dependency2 to compare
      * @param dependency2 a dependency2 to compare
      * @return true if the two dependencies have the same vulnerabilities
      */
     private boolean vulnerabilitiesMatch(Dependency dependency1, Dependency dependency2) {
         final Set<Vulnerability> one = dependency1.getVulnerabilities();
         final Set<Vulnerability> two = dependency2.getVulnerabilities();
         return one != null && two != null
                 && one.size() == two.size()
                 && one.containsAll(two);
     }
 
     /**
      * Determines if the two dependencies have the same base path.
      *
      * @param dependency1 a Dependency object
      * @param dependency2 a Dependency object
      * @return true if the base paths of the dependencies are identical
      */
     private boolean hasSameBasePath(Dependency dependency1, Dependency dependency2) {
         if (dependency1 == null || dependency2 == null) {
             return false;
         }
         final File lFile = new File(dependency1.getFilePath());
         String left = lFile.getParent();
         final File rFile = new File(dependency2.getFilePath());
         String right = rFile.getParent();
         if (left == null) {
             return right == null;
         } else if (right == null) {
             return false;
         }
         if (left.equalsIgnoreCase(right)) {
             return true;
         }
         final String localRepo = getSettings().getString(Settings.KEYS.MAVEN_LOCAL_REPO);
         final Pattern p;
         if (localRepo == null) {
             p = Pattern.compile(".*[/\\\\](?<repo>repository|local-repo)[/\\\\].*");
         } else {
             final File f = new File(localRepo);
             final String dir = f.getName();
             p = Pattern.compile(".*[/\\\\](?<repo>repository|local-repo|" + Pattern.quote(dir) + ")[/\\\\].*");
         }
         final Matcher mleft = p.matcher(left);
         final Matcher mright = p.matcher(right);
         if (mleft.find() && mright.find()) {
             left = getBaseRepoPath(left, mleft.group("repo"));
             right = getBaseRepoPath(right, mright.group("repo"));
         }
 
         if (left.equalsIgnoreCase(right)) {
             return true;
         }
         //new code
         for (Dependency child : dependency2.getRelatedDependencies()) {
             if (hasSameBasePath(child, dependency1)) {
                 return true;
             }
         }
         return false;
     }
 
     /**
      * This is likely a very broken attempt at determining if the 'left'
      * dependency is the 'core' library in comparison to the 'right' library.
      *
      * @param left the dependency to test
      * @param right the dependency to test against
      * @return a boolean indicating whether or not the left dependency should be
      * considered the "core" version.
      */
     protected boolean isCore(Dependency left, Dependency right) {
         final String leftName = left.getFileName().toLowerCase();
         final String rightName = right.getFileName().toLowerCase();
 
         final boolean returnVal;
         //TODO - should we get rid of this merging? It removes a true BOM...
 
         if (left.isVirtual() && !right.isVirtual()) {
             returnVal = true;
         } else if (!left.isVirtual() && right.isVirtual()) {
             returnVal = false;
         } else if ((!rightName.matches(".*\\.(tar|tgz|gz|zip|ear|war|rpm).+") && leftName.matches(".*\\.(tar|tgz|gz|zip|ear|war|rpm).+"))
                 || (rightName.contains("core") && !leftName.contains("core"))
                 || (rightName.contains("kernel") && !leftName.contains("kernel"))
                 || (rightName.contains("server") && !leftName.contains("server"))
                 || (rightName.contains("project") && !leftName.contains("project"))
                 || (rightName.contains("engine") && !leftName.contains("engine"))
                 || (rightName.contains("akka-stream") && !leftName.contains("akka-stream"))
                 || (rightName.contains("netty-transport") && !leftName.contains("netty-transport"))) {
             returnVal = false;
         } else if ((rightName.matches(".*\\.(tar|tgz|gz|zip|ear|war|rpm).+") && !leftName.matches(".*\\.(tar|tgz|gz|zip|ear|war|rpm).+"))
                 || (!rightName.contains("core") && leftName.contains("core"))
                 || (!rightName.contains("kernel") && leftName.contains("kernel"))
                 || (!rightName.contains("server") && leftName.contains("server"))
                 || (!rightName.contains("project") && leftName.contains("project"))
                 || (!rightName.contains("engine") && leftName.contains("engine"))
                 || (!rightName.contains("akka-stream") && leftName.contains("akka-stream"))
                 || (!rightName.contains("netty-transport") && leftName.contains("netty-transport"))) {
             returnVal = true;
         } else {
             /*
              * considered splitting the names up and comparing the components,
              * but decided that the file name length should be sufficient as the
              * "core" component, if this follows a normal naming protocol should
              * be shorter:
              * axis2-saaj-1.4.1.jar
              * axis2-1.4.1.jar       <-----
              * axis2-kernel-1.4.1.jar
              */
             returnVal = leftName.length() <= rightName.length();
         }
         LOGGER.debug("IsCore={} ({}, {})", returnVal, left.getFileName(), right.getFileName());
         return returnVal;
     }
 
     /**
      * Compares the SHA1 hashes of two dependencies to determine if they are
      * equal.
      *
      * @param dependency1 a dependency object to compare
      * @param dependency2 a dependency object to compare
      * @return true if the sha1 hashes of the two dependencies match; otherwise
      * false
      */
     private boolean hashesMatch(Dependency dependency1, Dependency dependency2) {
         if (dependency1 == null || dependency2 == null || dependency1.getSha1sum() == null || dependency2.getSha1sum() == null) {
             return false;
         }
         return dependency1.getSha1sum().equals(dependency2.getSha1sum());
     }
 
     /**
      * Determines if a JS file is from a webjar dependency.
      *
      * @param dependency the first dependency to compare
      * @param nextDependency the second dependency to compare
      * @return <code>true</code> if the dependency is a web jar and the next
      * dependency is a JS file from the web jar; otherwise <code>false</code>
      */
     protected boolean isWebJar(Dependency dependency, Dependency nextDependency) {
         if (dependency == null || dependency.getFileName() == null
                 || nextDependency == null || nextDependency.getFileName() == null
                 || dependency.getSoftwareIdentifiers().isEmpty()
                 || nextDependency.getSoftwareIdentifiers().isEmpty()) {
             return false;
         }
         final String mainName = dependency.getFileName().toLowerCase();
         final String nextName = nextDependency.getFileName().toLowerCase();
         if (mainName.endsWith(".jar") && nextName.endsWith(".js") && nextName.startsWith(mainName)) {
             return dependency.getSoftwareIdentifiers()
                     .stream().map(Identifier::getValue).collect(toSet())
                     .containsAll(nextDependency.getSoftwareIdentifiers().stream().map(this::identifierToWebJarForComparison).collect(toSet()));
         } else if (nextName.endsWith(".jar") && mainName.endsWith("js") && mainName.startsWith(nextName)) {
             return nextDependency.getSoftwareIdentifiers()
                     .stream().map(Identifier::getValue).collect(toSet())
                     .containsAll(dependency.getSoftwareIdentifiers().stream().map(this::identifierToWebJarForComparison).collect(toSet()));
         }
         return false;
     }
 
     /**
      * Attempts to convert a given JavaScript identifier to a web jar CPE.
      *
      * @param id a JavaScript CPE
      * @return a Maven CPE for a web jar if conversion is possible; otherwise
      * the original CPE is returned
      */
     private String identifierToWebJarForComparison(Identifier id) {
         if (id instanceof PurlIdentifier) {
             final PurlIdentifier pid = (PurlIdentifier) id;
             try {
                 final Identifier nid = new PurlIdentifier("maven", "org.webjars", pid.getName(), pid.getVersion(), pid.getConfidence());
                 return nid.getValue();
             } catch (MalformedPackageURLException ex) {
                 LOGGER.debug("Unable to build webjar purl id", ex);
                 return id.getValue();
             }
         } else {
             return id == null ? "" : id.getValue();
         }
     }
 
     /**
      * Determines if the jar is shaded and the created pom.xml identified the
      * same CPE as the jar - if so, the pom.xml dependency should be removed.
      *
      * @param dependency a dependency to check
      * @param nextDependency another dependency to check
      * @return true if on of the dependencies is a pom.xml and the identifiers
      * between the two collections match; otherwise false
      */
     protected boolean isShadedJar(Dependency dependency, Dependency nextDependency) {
         if (dependency == null || dependency.getFileName() == null
                 || nextDependency == null || nextDependency.getFileName() == null
                 || dependency.getSoftwareIdentifiers().isEmpty()
                 || nextDependency.getSoftwareIdentifiers().isEmpty()) {
             return false;
         }
         final String mainName = dependency.getFileName().toLowerCase();
         final String nextName = nextDependency.getFileName().toLowerCase();
         if (mainName.endsWith(".jar") && nextName.endsWith("pom.xml")) {
             return dependency.getSoftwareIdentifiers().containsAll(nextDependency.getSoftwareIdentifiers());
         } else if (nextName.endsWith(".jar") && mainName.endsWith("pom.xml")) {
             return nextDependency.getSoftwareIdentifiers().containsAll(dependency.getSoftwareIdentifiers());
         }
         return false;
     }
 
     /**
      * Determines which path is shortest; if path lengths are equal then we use
      * compareTo of the string method to determine if the first path is smaller.
      *
      * @param left the first path to compare
      * @param right the second path to compare
      * @return <code>true</code> if the leftPath is the shortest; otherwise
      * <code>false</code>
      */
     public static boolean firstPathIsShortest(String left, String right) {
         if (left.contains("dctemp") && !right.contains("dctemp")) {
             return false;
         }
         final String leftPath = left.replace('\\', '/');
         final String rightPath = right.replace('\\', '/');
 
         final int leftCount = countChar(leftPath, '/');
         final int rightCount = countChar(rightPath, '/');
         if (leftCount == rightCount) {
             return leftPath.compareTo(rightPath) <= 0;
         } else {
             return leftCount < rightCount;
         }
     }
 
     /**
      * Counts the number of times the character is present in the string.
      *
      * @param string the string to count the characters in
      * @param c the character to count
      * @return the number of times the character is present in the string
      */
     private static int countChar(String string, char c) {
         int count = 0;
         final int max = string.length();
         for (int i = 0; i < max; i++) {
             if (c == string.charAt(i)) {
                 count++;
             }
         }
         return count;
     }
 
     /**
      * Checks if the given file path is contained within a war or ear file.
      *
      * @param filePath the file path to check
      * @return true if the path contains '.war\' or '.ear\'.
      */
     private boolean containedInWar(String filePath) {
         return filePath != null && filePath.matches(".*\\.(ear|war)[\\\\/].*");
     }
 
     /**
      * Determine if the dependency ecosystem is equal in the given dependencies.
      *
      * @param ecoSystem the ecosystem to validate against
      * @param dependency a dependency to compare
      * @param nextDependency a dependency to compare
      * @return true if the ecosystem is equal in both dependencies; otherwise
      * false
      */
     private boolean ecosystemIs(String ecoSystem, Dependency dependency, Dependency nextDependency) {
         return ecoSystem.equals(dependency.getEcosystem()) && ecoSystem.equals(nextDependency.getEcosystem());
     }
 
     /**
      * Determine if the dependency name is equal in the given dependencies.
      *
      * @param dependency a dependency to compare
      * @param nextDependency a dependency to compare
      * @return true if the name is equal in both dependencies; otherwise false
      */
     private boolean namesAreEqual(Dependency dependency, Dependency nextDependency) {
         return dependency.getName() != null && dependency.getName().equals(nextDependency.getName());
     }
 
     /**
      * Determine if the dependency version is equal in the given dependencies.
      * This method attempts to evaluate version range checks.
      *
      * @param current a dependency version to compare
      * @param next a dependency version to compare
      * @return true if the version is equal in both dependencies; otherwise
      * false
      */
     public static boolean npmVersionsMatch(String current, String next) {
         String left = current;
         String right = next;
         if (left == null || right == null) {
             return false;
         }
         if (left.equals(right) || "*".equals(left) || "*".equals(right)) {
             return true;
         }
         if (left.contains(" ")) { // we have a version string from package.json
             if (right.contains(" ")) { // we can't evaluate this ">=1.5.4 <2.0.0" vs "2 || 3"
                 return false;
             }
             if (!right.matches("^\\d.*$")) {
                 right = stripLeadingNonNumeric(right);
                 if (right == null) {
                     return false;
                 }
             }
             try {
                 final Semver v = new Semver(right);
                 return v.satisfies(left);
             } catch (SemverException ex) {
                 LOGGER.trace("ignore", ex);
             }
         } else {
             if (!left.matches("^\\d.*$")) {
                 left = stripLeadingNonNumeric(left);
                 if (left == null || left.isEmpty()) {
                     return false;
                 }
             }
             try {
                 Semver v = new Semver(left);
                 if (!right.isEmpty() && v.satisfies(right)) {
                     return true;
                 }
                 if (!right.contains(" ")) {
                     left = current;
                     right = stripLeadingNonNumeric(right);
                     if (right != null) {
                         v = new Semver(right);
                         return v.satisfies(left);
                     }
                 }
             } catch (SemverException ex) {
                 LOGGER.trace("ignore", ex);
             } catch (NullPointerException ex) {
                 LOGGER.error("SemVer comparison error: left:\"{}\", right:\"{}\"", left, right);
                 LOGGER.debug("SemVer comparison resulted in NPE", ex);
             }
         }
         return false;
     }
 
     /**
      * Strips leading non-numeric values from the start of the string. If no
      * numbers are present this will return null.
      *
      * @param str the string to modify
      * @return the string without leading non-numeric characters
      */
     private static String stripLeadingNonNumeric(String str) {
         for (int x = 0; x < str.length(); x++) {
             if (Character.isDigit(str.codePointAt(x))) {
                 return str.substring(x);
             }
         }
         return null;
     }
 
 }