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/*******************************************************************************
* Copyright (c) 2005 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Rational Software - Initial API and implementation
*******************************************************************************/
package org.eclipse.cdt.core.parser;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.MappedByteBuffer;
import java.nio.channels.FileChannel;
import java.nio.charset.Charset;
import org.eclipse.cdt.core.parser.util.CharArrayUtils;
/**
* @author jcamelon
*/
public class CodeReader {
public static final String SYSTEM_DEFAULT_ENCODING = System.getProperty( "file.encoding" ); //$NON-NLS-1$
private static final String NF = "<text>"; //$NON-NLS-1$
private static final char [] NOFILE = NF.toCharArray(); //$NON-NLS-1$
public final char[] buffer;
public final char[] filename;
// If you already have preloaded the buffer, e.g. working copy
public CodeReader(String filename, char[] buffer) {
this.filename = filename.toCharArray();
this.buffer = buffer;
}
// If you are just scanning a string
public CodeReader(char[] buffer) {
this(NF, buffer);
}
// If you are loading up a file normally
public CodeReader(String filename) throws IOException
{
this.filename = filename.toCharArray();
FileInputStream stream = new FileInputStream(filename);
try {
buffer = load(SYSTEM_DEFAULT_ENCODING, stream);
} finally {
stream.close();
}
}
public CodeReader(String filename, String charSet ) throws IOException
{
this.filename = filename.toCharArray();
FileInputStream stream = new FileInputStream(filename);
try {
buffer = load(charSet, stream);
} finally {
stream.close();
}
}
public CodeReader( String filename, InputStream stream ) throws IOException
{
this( filename, SYSTEM_DEFAULT_ENCODING, stream );
}
public CodeReader( String fileName, String charSet, InputStream stream ) throws IOException {
filename = fileName.toCharArray();
FileInputStream fstream =
(stream instanceof FileInputStream)
? (FileInputStream)stream
: new FileInputStream(fileName);
try {
buffer = load(charSet, fstream);
} finally {
// If we create the FileInputStream we need close to it when done,
// if not we figure the above layer will do it.
if (!(stream instanceof FileInputStream)) {
fstream.close();
}
}
}
private char[] load( String charSet, FileInputStream stream ) throws IOException {
String encoding = Charset.isSupported( charSet ) ? charSet : SYSTEM_DEFAULT_ENCODING;
FileChannel channel = stream.getChannel();
ByteBuffer byteBuffer = ByteBuffer.allocateDirect((int)channel.size());
channel.read(byteBuffer);
byteBuffer.rewind();
CharBuffer charBuffer = Charset.forName(encoding).decode(byteBuffer);
if (charBuffer.hasArray())
return charBuffer.array();
// Got to copy it out
char[] buff = new char[charBuffer.length()];
charBuffer.get(buff);
return buff;
}
protected char[] xload(FileInputStream stream) throws IOException {
FileChannel channel = stream.getChannel();
MappedByteBuffer map = channel.map(FileChannel.MapMode.READ_ONLY, 0, channel.size());
// TODO use the real encoding
CharBuffer charBuffer = Charset.forName(SYSTEM_DEFAULT_ENCODING).decode(map);
if (charBuffer.hasArray())
return charBuffer.array();
// Got to copy it out
char[] buff = new char[charBuffer.length()];
charBuffer.get(buff);
return buff;
}
public boolean isFile() {
return !CharArrayUtils.equals( filename, NOFILE );
}
public String toString() {
return getPath();
}
public String getPath()
{
return new String( filename );
}
}
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