/*******************************************************************************
 * Copyright (c) 2000, 2006 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 Corporation - initial API and implementation
 *     Outhink - support for typeFileURL
 *******************************************************************************/
module dwt.dnd;

import java.io.*;
import dwt.internal.carbon.*;
 
/**
 * The class <code>FileTransfer</code> provides a platform specific mechanism 
 * for converting a list of files represented as a java <code>String[]</code> to a 
 * platform specific representation of the data and vice versa.  
 * Each <code>String</code> in the array contains the absolute path for a single 
 * file or directory.
 * See <code>Transfer</code> for additional information.
 * 
 * <p>An example of a java <code>String[]</code> containing a list of files is shown 
 * below:</p>
 * 
 * <code><pre>
 *     File file1 = new File("C:\temp\file1");
 *     File file2 = new File("C:\temp\file2");
 *     String[] fileData = new String[2];
 *     fileData[0] = file1.getAbsolutePath();
 *     fileData[1] = file2.getAbsolutePath();
 * </code></pre>
 */
public class FileTransfer : ByteArrayTransfer {
    
    static FileTransfer _instance = new FileTransfer();
    static final String HFS = "hfs "; //$NON-NLS-1$
    static final String FURL = "furl"; //$NON-NLS-1$
    static final int HFSID = registerType(HFS);
    static final int FURLID = registerType(FURL);
    
FileTransfer() {}

/**
 * Returns the singleton instance of the FileTransfer class.
 *
 * @return the singleton instance of the FileTransfer class
 */
public static FileTransfer getInstance () {
    return _instance;
}

/**
 * This implementation of <code>javaToNative</code> converts a list of file names
 * represented by a java <code>String[]</code> to a platform specific representation.
 * Each <code>String</code> in the array contains the absolute path for a single 
 * file or directory.  For additional information see 
 * <code>Transfer#javaToNative</code>.
 * 
 * @param object a java <code>String[]</code> containing the file names to be 
 * converted
 * @param transferData an empty <code>TransferData</code> object; this
 *  object will be filled in on return with the platform specific format of the data
 */
public void javaToNative(Object object, TransferData transferData) {
    if (!checkFile(object) || !isSupportedType(transferData)) {
        DND.error(DND.ERROR_INVALID_DATA);
    }
    String[] files = (String[])object;
    transferData.result = -1;
    byte[][] data = new byte[files.length][];
    for (int i = 0; i < data.length; i++) {
        File file = new File(files[i]);
        bool isDirectory = file.isDirectory();
        String fileName = files[i];
        char [] chars = new char [fileName.length ()];
        fileName.getChars (0, chars.length, chars, 0);
        int cfString = OS.CFStringCreateWithCharacters (OS.kCFAllocatorDefault, chars, chars.length);
        if (cfString is 0) return;
        try {
            int url = OS.CFURLCreateWithFileSystemPath(OS.kCFAllocatorDefault, cfString, OS.kCFURLPOSIXPathStyle, isDirectory);
            if (url is 0) return;
            try {
                if (transferData.type is HFSID) {
                    byte[] fsRef = new byte[80];
                    if (!OS.CFURLGetFSRef(url, fsRef)) return;
                    byte[] fsSpec = new byte[70];
                    if (OS.FSGetCatalogInfo(fsRef, 0, null, null, fsSpec, null) !is OS.noErr) return;
                    byte[] hfsflavor = new byte[10 + fsSpec.length];
                    byte[] finfo = new byte[16];
                    OS.FSpGetFInfo(fsSpec, finfo);
                    System.arraycopy(finfo, 0, hfsflavor, 0, 10);
                    System.arraycopy(fsSpec, 0, hfsflavor, 10, fsSpec.length);
                    data[i] = hfsflavor;
                }
                if (transferData.type is FURLID) {
                    int encoding = OS.CFStringGetSystemEncoding();
                    int theData = OS.CFURLCreateData(OS.kCFAllocatorDefault, url, encoding, true);
                    if (theData is 0) return;
                    try {
                        int length = OS.CFDataGetLength(theData);
                        byte[] buffer = new byte[length];
                        CFRange range = new CFRange();
                        range.length = length;
                        OS.CFDataGetBytes(theData, range, buffer);
                        data[i] = buffer;
                    } finally {
                        OS.CFRelease(theData);
                    }
                }
            } finally {
                OS.CFRelease(url);
            }
        } finally {
            OS.CFRelease(cfString);
        }
    }
    transferData.data = data;
    transferData.result = 0;
}
/**
 * This implementation of <code>nativeToJava</code> converts a platform specific 
 * representation of a list of file names to a java <code>String[]</code>.  
 * Each String in the array contains the absolute path for a single file or directory. 
 * For additional information see <code>Transfer#nativeToJava</code>.
 * 
 * @param transferData the platform specific representation of the data to be 
 * been converted
 * @return a java <code>String[]</code> containing a list of file names if the 
 * conversion was successful; otherwise null
 */
public Object nativeToJava(TransferData transferData) {
    if (!isSupportedType(transferData) || transferData.data is null) return null;
    if (transferData.data.length is 0) return null;
    int count = transferData.data.length;
    String[] fileNames = new String[count];
    for (int i=0; i<count; i++) {
        byte[] data = transferData.data[i];
        int url = 0;
        if (transferData.type is HFSID) {
            byte[] fsspec = new byte[data.length - 10];
            System.arraycopy(data, 10, fsspec, 0, fsspec.length);
            byte[] fsRef = new byte[80];
            if (OS.FSpMakeFSRef(fsspec, fsRef) !is OS.noErr) return null;
            url = OS.CFURLCreateFromFSRef(OS.kCFAllocatorDefault, fsRef);
            if (url is 0) return null;
        }
        if (transferData.type is FURLID) {
            int encoding = OS.kCFStringEncodingUTF8;
            url = OS.CFURLCreateWithBytes(OS.kCFAllocatorDefault, data, data.length, encoding, 0);
            if (url is 0) return null;
        }
        try {
            int path = OS.CFURLCopyFileSystemPath(url, OS.kCFURLPOSIXPathStyle);
            if (path is 0) return null;
            try {
                int length = OS.CFStringGetLength(path);
                if (length is 0) return null;
                char[] buffer= new char[length];
                CFRange range = new CFRange();
                range.length = length;
                OS.CFStringGetCharacters(path, range, buffer);
                fileNames[i] = new String(buffer);
            } finally {
                OS.CFRelease(path);
            }
        } finally {
            OS.CFRelease(url);
        }
    }
    return fileNames;
}

protected int[] getTypeIds(){
    return new int[] {FURLID, HFSID};
}

protected String[] getTypeNames(){
    return new String[] {FURL, HFS};
}

bool checkFile(Object object) {
    if (object is null || !(object instanceof String[]) || ((String[])object).length is 0) return false;
    String[] Strings = (String[])object;
    for (int i = 0; i < Strings.length; i++) {
        if (Strings[i] is null || Strings[i].length() is 0) return false;
    }
    return true;
}

protected bool validate(Object object) {
    return checkFile(object);
}
}