/*
 *                 Sun Public License Notice
 * 
 * The contents of this file are subject to the Sun Public License
 * Version 1.0 (the "License"). You may not use this file except in
 * compliance with the License. A copy of the License is available at
 * http://www.sun.com/
 * 
 * The Original Code is NetBeans. The Initial Developer of the Original
 * Code is Sun Microsystems, Inc. Portions Copyright 1997-2003 Sun
 * Microsystems, Inc. All Rights Reserved.
 */
package org.netbeans.modules.javacore.parser;

import java.io.IOException;
import java.io.Reader;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import org.openide.filesystems.FileObject;

/**
 *
 * @author  sdedic
 * @version 
 */
public class Util {
    static final String ATTR_FILE_ENCODING = "Content-Encoding"; // NOI18N
    
    /** Retrieves file's encoding. Returns the default encoding for java files,
     * if the file's specific encoding is not set.
     * Disclaimer: this method is not an API method. It may not
     * be available in future releases.
     * @param someFile file object to retrieve encoding for
     * @return encoding string, or null if no explicit encoding is given in file's
     * or IDE's settings.
     *
     */
    public static String getFileEncoding(FileObject someFile) {
        String enc = (String) someFile.getAttribute(ATTR_FILE_ENCODING);

        if (enc == null) {
// [TODO]            enc = JavaSettings.getDefault().getDefaultEncoding();
        }
        if ("".equals(enc))
            return null;
        else
            return enc;
    }
    
    public static char[] readContents(Reader r) throws IOException {
        int read = 0;
        int total = 0;
        int offset;
        char[] buffer;
        List buflist = new LinkedList();
        
        do {
            buffer = new char[2048];
            offset = 0;
            while (offset < buffer.length) {
                read = r.read(buffer, offset, buffer.length - offset);
                if (read == -1) break;
                offset += read;
            }
            if (offset > 0) buflist.add(buffer);
            total += offset;
        } while (read >= 0);
        r.close();
        
        buffer = new char[total];
        Iterator it = buflist.iterator();
        int offset2 = 0;
        while (it.hasNext()) {
            char[] buf = (char[])it.next();
            int size = (it.hasNext()) ? buf.length : total - offset2;
            System.arraycopy(buf, 0, buffer, offset2, size);
            offset2 += size;
        }
        return buffer;
    }
    
}