SimpleFileReader.java

/*
 * Copyright 2009 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 com.google.jstestdriver;

import java.io.BufferedInputStream;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.nio.charset.Charset;

/**
 * A simple filereader.
 * @author corysmith
 */
public class SimpleFileReader implements FileReader {
  public static final char UTF8_BOM = '\uFEFF';

  public String readFile(String file)  {
    InputStreamReader reader = null;
    try {
      reader = new InputStreamReader(new BufferedInputStream(
        new FileInputStream(file)), Charset.forName("UTF-8"));
      StringBuilder sb = new StringBuilder();

      // remove the UTF8 BOM if exists.
      int c = reader.read();
      if (c != UTF8_BOM && c != -1) {
        sb.append((char) c);
      }
      for (c = reader.read(); c != -1; c = reader.read()) {
        sb.append((char) c);
      }

      String contents = sb.toString();
      return contents;
    } catch (IOException e) {
      throw new RuntimeException("Impossible to read file: " + file, e);
    } finally {
      if (reader != null) {
        try {
          reader.close();
        } catch (IOException e) {
          // ignore
        }
      }
    }
  }
}