/*
    * 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.scm.provider.git.gitexe.command;
  
  import java.io.File;
  import java.util.ArrayList;
  import java.util.Iterator;
  import java.util.List;
  
  import org.apache.maven.scm.ScmFile;
  import org.apache.maven.scm.util.AbstractConsumer;
  
  /**
   * @author <a href="mailto:kenney@apache.org">Kenney Westerhof</a>
   * @author Olivier Lamy
   *
   */
  public abstract class AbstractFileCheckingConsumer extends AbstractConsumer {
      protected File workingDirectory;
  
      private final List<ScmFile> files = new ArrayList<>();
  
      protected int revision;
  
      private boolean filtered;
  
      public AbstractFileCheckingConsumer(File workingDirectory) {
          this.workingDirectory = workingDirectory;
      }
  
      /** {@inheritDoc} */
      public final void consumeLine(String line) {
          if (line.length() <= 3) {
              return;
          }
  
          if (logger.isDebugEnabled()) {
              logger.debug(line);
          }
  
          parseLine(line);
      }
  
      protected abstract void parseLine(String line);
  
      protected List<ScmFile> getFiles() {
          if (!filtered) {
              for (Iterator<ScmFile> it = files.iterator(); it.hasNext(); ) {
                  if (!new File(workingDirectory, it.next().getPath()).isFile()) {
                      it.remove();
                  }
              }
  
              filtered = true;
          }
  
          return files;
      }
  
      protected final int parseInt(String revisionString) {
          try {
              return Integer.parseInt(revisionString);
          } catch (NumberFormatException ex) {
              return 0;
          }
      }
  
      protected void addFile(ScmFile file) {
          files.add(file);
      }
  
      public final int getRevision() {
          return revision;
      }
  }