org.codehaus.groovy.control.io.FileReaderSource Maven / Gradle / Ivy
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* 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
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* 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 org.codehaus.groovy.control.CompilerConfiguration;
import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.net.URI;
import java.nio.charset.Charset;
/**
* A ReaderSource for source files.
*
* @author Chris Poirier
*/
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;
}
public File getFile() {
return 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 );
}
/**
* Returns a URI for the file of this source.
*
* @return URI for the file of this source.
*/
public URI getURI() {
return file.toURI();
}
}