package org.codehaus.plexus.util;
/*
* Copyright The Codehaus Foundation.
*
* 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.
*/
import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.io.UnsupportedEncodingException;
import java.net.URL;
import java.nio.charset.Charset;
import org.codehaus.plexus.util.xml.XmlStreamReader;
/**
* Utility to create Readers from streams, with explicit encoding choice: platform default,
* XML, or specified.
*
* @author <a href="mailto:hboutemy@codehaus.org">Herve Boutemy</a>
* @see Charset
* @see <a href="http://java.sun.com/j2se/1.4.2/docs/guide/intl/encoding.doc.html">Supported encodings</a>
* @version $Id$
* @since 1.4.3
*/
public class ReaderFactory
{
/**
* ISO Latin Alphabet #1, also known as ISO-LATIN-1.
* Every implementation of the Java platform is required to support this character encoding.
* @see Charset
*/
public static final String ISO_8859_1 = "ISO-8859-1";
/**
* Seven-bit ASCII, also known as ISO646-US, also known as the Basic Latin block of the Unicode character set.
* Every implementation of the Java platform is required to support this character encoding.
* @see Charset
*/
public static final String US_ASCII = "US-ASCII";
/**
* Sixteen-bit Unicode Transformation Format, byte order specified by a mandatory initial byte-order mark (either
* order accepted on input, big-endian used on output).
* Every implementation of the Java platform is required to support this character encoding.
* @see Charset
*/
public static final String UTF_16 = "UTF-16";
/**
* Sixteen-bit Unicode Transformation Format, big-endian byte order.
* Every implementation of the Java platform is required to support this character encoding.
* @see Charset
*/
public static final String UTF_16BE = "UTF-16BE";
/**
* Sixteen-bit Unicode Transformation Format, little-endian byte order.
* Every implementation of the Java platform is required to support this character encoding.
* @see Charset
*/
public static final String UTF_16LE = "UTF-16LE";
/**
* Eight-bit Unicode Transformation Format.
* Every implementation of the Java platform is required to support this character encoding.
* @see Charset
*/
public static final String UTF_8 = "UTF-8";
/**
* The <code>file.encoding</code> System Property.
*/
public static final String FILE_ENCODING = System.getProperty( "file.encoding" );
/**
* Create a new Reader with XML encoding detection rules.
*
* @param in not null input stream.
* @return an XML reader instance for the input stream.
* @throws IOException if any.
* @see XmlStreamReader
*/
public static XmlStreamReader newXmlReader( InputStream in )
throws IOException
{
return new XmlStreamReader( in );
}
/**
* Create a new Reader with XML encoding detection rules.
*
* @param file not null file.
* @return an XML reader instance for the input file.
* @throws IOException if any.
* @see XmlStreamReader
*/
public static XmlStreamReader newXmlReader( File file )
throws IOException
{
return new XmlStreamReader( file );
}
/**
* Create a new Reader with XML encoding detection rules.
*
* @param url not null url.
* @return an XML reader instance for the input url.
* @throws IOException if any.
* @see XmlStreamReader
*/
public static XmlStreamReader newXmlReader( URL url )
throws IOException
{
return new XmlStreamReader( url );
}
/**
* Create a new Reader with default plaform encoding.
*
* @param in not null input stream.
* @return a reader instance for the input stream using the default platform charset.
* @see Charset#defaultCharset()
*/
public static Reader newPlatformReader( InputStream in )
{
return new InputStreamReader( in );
}
/**
* Create a new Reader with default plaform encoding.
*
* @param file not null file.
* @return a reader instance for the input file using the default platform charset.
* @throws FileNotFoundException if any.
* @see Charset#defaultCharset()
*/
public static Reader newPlatformReader( File file )
throws FileNotFoundException
{
return new FileReader( file );
}
/**
* Create a new Reader with default plaform encoding.
*
* @param url not null url.
* @return a reader instance for the input url using the default platform charset.
* @throws IOException if any.
* @see Charset#defaultCharset()
*/
public static Reader newPlatformReader( URL url )
throws IOException
{
return new InputStreamReader( url.openStream() );
}
/**
* Create a new Reader with specified encoding.
*
* @param in not null input stream.
* @param encoding not null supported encoding.
* @return a reader instance for the input stream using the given encoding.
* @throws UnsupportedEncodingException if any.
* @see <a href="http://java.sun.com/j2se/1.4.2/docs/guide/intl/encoding.doc.html">Supported encodings</a>
*/
public static Reader newReader( InputStream in, String encoding )
throws UnsupportedEncodingException
{
return new InputStreamReader( in, encoding );
}
/**
* Create a new Reader with specified encoding.
*
* @param file not null file.
* @param encoding not null supported encoding.
* @return a reader instance for the input file using the given encoding.
* @throws FileNotFoundException if any.
* @throws UnsupportedEncodingException if any.
* @see <a href="http://java.sun.com/j2se/1.4.2/docs/guide/intl/encoding.doc.html">Supported encodings</a>
*/
public static Reader newReader( File file, String encoding )
throws FileNotFoundException, UnsupportedEncodingException
{
FileInputStream in = new FileInputStream( file );
BufferedInputStream bis = new BufferedInputStream( in, 32768 );
return new InputStreamReader( bis, encoding );
}
/**
* Create a new Reader with specified encoding.
*
* @param url not null url.
* @param encoding not null supported encoding.
* @return a reader instance for the input url using the given encoding.
* @throws IOException if any.
* @see <a href="http://java.sun.com/j2se/1.4.2/docs/guide/intl/encoding.doc.html">Supported encodings</a>
*/
public static Reader newReader( URL url, String encoding )
throws IOException
{
return new InputStreamReader( url.openStream(), encoding );
}
}