content: package act.app;
  
  /*-
   * #%L
   * ACT Framework
   * %%
   * Copyright (C) 2014 - 2017 ActFramework
   * %%
   * 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%
   */
  
  import act.Act;
  import act.plugin.Plugin;
  import org.osgl.$;
  import org.osgl.exception.NotAppliedException;
  import org.osgl.util.IO;
  
  import java.io.File;
  import java.util.List;
  
  /**
   * Common implementation of {@link ProjectLayoutProbe}
   * by inspecting a certain application build file, e.g. pom.xml for maven
   * based application
   */
  public class BuildFileProbe extends ProjectLayoutProbe {
  
      public interface BuildFileNameProvider {
          String buildFileName();
      }
  
      public static abstract class FileParser
              extends $.F1<File, ProjectLayout>
              implements BuildFileNameProvider, Plugin {
  
          @Override
          public ProjectLayout apply(File file) throws NotAppliedException, $.Break {
              return parse(file);
          }
  
          @Override
          public void register() {
              Act.mode().appScanner().register(new BuildFileProbe(this));
          }
  
          protected abstract ProjectLayout parse(File file);
      }
  
      public static abstract class StringParser
              extends $.F1<String, ProjectLayout>
              implements BuildFileNameProvider, Plugin {
  
  
          @Override
          public ProjectLayout apply(String s) throws NotAppliedException, $.Break {
              return parse(s);
          }
  
          @Override
          public void register() {
              Act.mode().appScanner().register(new BuildFileProbe(this));
          }
  
          protected abstract ProjectLayout parse(String fileContent);
      }
  
      public static abstract class LinesParser
              extends $.F1<List<String>, ProjectLayout>
              implements BuildFileNameProvider, Plugin {
  
          @Override
          public ProjectLayout apply(List<String> lines) throws NotAppliedException, $.Break {
              return parse(lines);
          }
  
          @Override
          public void register() {
              Act.mode().appScanner().register(new BuildFileProbe(this));
          }
  
          protected abstract ProjectLayout parse(List<String> lines);
      }
  
      private String buildFileName;
      private FileParser fileParser = null;
      private StringParser stringParser = null;
      private LinesParser linesParser = null;
  
      public BuildFileProbe(FileParser fp) {
          buildFileName = fp.buildFileName();
          fileParser = fp;
      }
  
      public BuildFileProbe(StringParser sp) {
          buildFileName = sp.buildFileName();
          stringParser = sp;
      }
  
      public BuildFileProbe(LinesParser lp) {
          buildFileName = lp.buildFileName();
          linesParser = lp;
      }
  
      public String buildFileName() {
          return buildFileName;
      }
  
      @Override
      public ProjectLayout probe(File appBase) {
          File buildFile = new File(appBase, buildFileName);
          if (buildFile.exists() && buildFile.canRead()) {
              if (null != fileParser) {
                  return fileParser.parse(buildFile);
              } else if (null != stringParser) {
                  return stringParser.parse(IO.readContentAsString(buildFile));
              } else if (null != linesParser) {
                  return linesParser.parse(IO.readLines(buildFile));
              }
              assert false;
          }
          return null;
      }
  }
  