FileLineReader.java

/*
 * Copyright (C) 2012 Google Inc.
 *
 * 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.
 */

package interactivespaces.util.io;

import interactivespaces.InteractiveSpacesException;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;

/**
 * Read a file and process each line individually.
 *
 * @author Keith M. Hughes
 */
public class FileLineReader {

  /**
   * Read through the contents of the file and process each line from the file
   * using the supplied {@link LineReaderHandler}.
   *
   * @param source
   *          The file to read.
   * @param handler
   *          The handler which will process each line.
   */
  public void process(File source, LineReaderHandler handler) {
    BufferedReader reader = null;
    try {
      reader = new BufferedReader(new FileReader(source));

      String line;
      while ((line = reader.readLine()) != null) {
        handler.processLine(line);
      }
    } catch (Exception e) {
      throw new InteractiveSpacesException("Unable to read file " + source, e);
    } finally {
      if (reader != null)
        try {
          reader.close();
        } catch (IOException e) {
          // Don't care. Closing.
        }
    }
  }
}