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/*******************************************************************************
* Copyright (c) 2008 Institute for Software, HSR Hochschule fuer Technik
* Rapperswil, University of applied sciences 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:
* Institute for Software - initial API and implementation
******************************************************************************/
package org.eclipse.cdt.internal.ui.refactoring.utils;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import org.eclipse.core.resources.IFile;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.cdt.ui.CUIPlugin;
/**
* Some helper methods to access part of the content of an ifile
*
* @author Emanuel Graf
*
*/
public class FileContentHelper {
private static final int bufferSize = 512;
public static String getContent(IFile file, int start) throws CoreException, IOException{
InputStreamReader reader = getReaderForFile(file);
skip(start, reader);
return readRest(reader);
}
public static String getContent(IFile file, int start, int length) {
try {
InputStreamReader r = getReaderForFile(file);
char[] bytes = new char[length];
skip(start, r);
read(length, r, bytes);
return new String(bytes);
} catch (IOException e) {
CUIPlugin.log(e);
} catch (CoreException e) {
CUIPlugin.log(e);
}
return ""; //$NON-NLS-1$
}
private static InputStreamReader getReaderForFile(IFile file)
throws CoreException, UnsupportedEncodingException {
InputStream contents = file.getContents();
InputStreamReader r = new InputStreamReader(contents, file.getCharset());
return r;
}
private static String readRest(InputStreamReader reader) throws IOException{
StringBuilder content = new StringBuilder();
char[] buffer = new char[bufferSize];
int bytesRead = 0;
while((bytesRead = reader.read(buffer)) >= 0){
content.append(buffer, 0, bytesRead);
}
return content.toString();
}
private static void read(int length, InputStreamReader r, char[] bytes)
throws IOException {
int bufferOffset = 0;
int charactersRead = 0;
while(charactersRead >= 0 && length > 0){
charactersRead = r.read(bytes, bufferOffset, length);
if(charactersRead > 0){
bufferOffset += charactersRead;
length -= charactersRead;
}
}
}
private static void skip(int start, InputStreamReader r) throws IOException {
long skipped = 0;
while(skipped >= 0 && start > 0 && r.ready()){
skipped = r.skip(start);
if(skipped > 0){
start -= skipped;
}
}
}
}
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