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Groovy example source code file (FileReaderSource.java)

This example Groovy source code file (FileReaderSource.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Groovy tags/keywords

bufferedinputstream, charset, charset, compilerconfiguration, file, file, fileinputstream, filereadersource, filereadersource, inputstream, io, ioexception, ioexception, reader, utf8

The Groovy FileReaderSource.java source code

/*
 * Copyright 2003-2007 the original author or authors.
 *
 * 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 org.codehaus.groovy.control.io;

import java.io.*;
import java.nio.charset.Charset;

import org.codehaus.groovy.control.CompilerConfiguration;

/**
 *  A ReaderSource for source files.
 *
 *  @author <a href="mailto:cpoirier@dreaming.org">Chris Poirier
 *  @version $Id: FileReaderSource.java 10715 2008-02-04 11:10:47Z glaforge $
 */
public class FileReaderSource extends AbstractReaderSource {
    private File file;  // The File from which we produce Readers.
    private final Charset UTF8 = Charset.forName("UTF-8");

   /**
    *  Creates the ReaderSource from a File descriptor.
    * @param file script source file
    * @param configuration configuration for compiling source
    */
    public FileReaderSource( File file, CompilerConfiguration configuration ) {
       super( configuration );
        this.file = file;
    }

   /**
    *  Returns a new Reader on the underlying source object.  
    */
    public Reader getReader() throws IOException {
       // we want to remove the BOM windows adds from a file if the encoding is UTF-8
       // in other cases we depend on the charsets 
       Charset cs = Charset.forName(configuration.getSourceEncoding());
       InputStream in = new BufferedInputStream(new FileInputStream(file));
       if (UTF8.name().equalsIgnoreCase(cs.name())) {
           in.mark(3);
           boolean hasBOM = true;
           try {
               int i = in.read();
               hasBOM &= i == 0xEF;
               i = in.read();
               hasBOM &= i == 0xBB;
               i = in.read();
               hasBOM &= i == 0xFF;
           } catch (IOException ioe) {
               hasBOM= false;
           }
           if (!hasBOM) in.reset();
       }
       return new InputStreamReader( in, cs );
    }
    
}

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