BEGIN LICENSE BLOCK *****
Version: EPL 2.0/GPL 2.0/LGPL 2.1
The contents of this file are subject to the Eclipse Public
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.eclipse.org/legal/epl-v20.html
Software distributed under the License is distributed on an "AS
IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
implied. See the License for the specific language governing
rights and limitations under the License.
Copyright (C) 2005 Thomas E. Enebo 
Alternatively, the contents of this file may be used under the terms of
either of the GNU General Public License Version 2 or later (the "GPL"),
or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
in which case the provisions of the GPL or the LGPL are applicable instead
of those above. If you wish to allow use of your version of this file only
under the terms of either the GPL or the LGPL, and not to allow others to
use your version of this file under the terms of the EPL, indicate your
decision by deleting the provisions above and replace them with the notice
and other provisions required by the GPL or the LGPL. If you do not delete
the provisions above, a recipient may use your version of this file under
the terms of any one of the EPL, the GPL or the LGPL.
END LICENSE BLOCK /***** BEGIN LICENSE BLOCK *****
 * Version: EPL 2.0/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Eclipse Public
 * 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.eclipse.org/legal/epl-v20.html
 *
 * Software distributed under the License is distributed on an "AS
 * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * rights and limitations under the License.
 *
 * Copyright (C) 2005 Thomas E. Enebo <enebo@acm.org>
 * 
 * Alternatively, the contents of this file may be used under the terms of
 * either of the GNU General Public License Version 2 or later (the "GPL"),
 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the EPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the EPL, the GPL or the LGPL.
 ***** END LICENSE BLOCK *****/

package org.jruby.runtime.load;

import org.jruby.util.StringSupport;
import org.jruby.util.URLUtil;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URL;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;

Simple struct to capture name separate from URL.  URL and File have internal
logic which does unexpected things when presenting the resource as a string.
/**
 * Simple struct to capture name separate from URL.  URL and File have internal
 * logic which does unexpected things when presenting the resource as a string.
 */
public class LoadServiceResource {
    private final URL resource;
    private final File path;
    private final String name;
    private final boolean absolute;
    private String absolutePath;

    public LoadServiceResource(URL resource, String name) {
        this.resource = resource;
        this.path = null;
        this.name = name;
        this.absolute = false;
    }

    public LoadServiceResource(URL resource, String name, boolean absolute) {
        this.resource = resource;
        this.path = null;
        this.name = name;
        this.absolute = absolute;
    }
    
    public LoadServiceResource(File path, String name) {
        this.resource = null;
        this.path = path;
        this.name = name;
        this.absolute = false;
    }

    public LoadServiceResource(File path, String name, boolean absolute) {
        this.resource = null;
        this.path = path;
        this.name = name;
        this.absolute = absolute;
    }

    public InputStream getInputStream() throws IOException {
        if (resource != null) {
            InputStream is = resource.openStream();
            try {
                return new LoadServiceResourceInputStream(is);
            } finally {
                is.close();
            }
        }
        byte[] bytes = new byte[(int)path.length()];
        ByteBuffer buffer = ByteBuffer.wrap(bytes);
        FileInputStream fis = new FileInputStream(path);
        FileChannel fc = fis.getChannel();
        fc.read(buffer);
        fis.close();
        return new LoadServiceResourceInputStream(bytes);
    }

    public String getName() {
        return name;
    }

    public File getPath() {
        return path;
    }
    
    public URL getURL() throws IOException {
        if (resource != null) {
            return resource;
        } else {
            String absolutePath = path.getAbsolutePath();
            try {
                return new URI("file", absolutePath, null).toURL();
            } catch(URISyntaxException e) {
                try {
                    // Let's try this one more time.  For some reason [ and ]
                    // are not getting escaped in URI (I think they are for
                    // ipv6 host stuff).  We make this double attempt so that
                    // we are not constantly trying to string substitute every 
                    // path we encounter.
                    return new URI("file", escapeReservedChars(absolutePath), null).toURL();
                } catch (URISyntaxException ee) {
                    throw new IOException(ee.getMessage());
                }
            }
        }
    }
    
    // URI Does not escape all characters.  In particular the characters
    // marked as 'reserved' in the URI spec: ?/[]@.  Of these characters
    // the file: uri only seems to care about '[' and ']'.  Let's escape
    // them
    private static String escapeReservedChars(String path) {
        String str = path;
        str = StringSupport.replaceAll(str, "[", "%5b").toString();
        str = StringSupport.replaceAll(str, "]", "%5a").toString();
        return str;
    }

    public String getAbsolutePath() {
        if (absolutePath != null) return absolutePath;
        
        try {
            return absolutePath = new File(URLUtil.getPath(getURL())).getCanonicalPath();
        } catch (IOException e) {
            return absolutePath = resource.toString();
        }
    }

    public boolean isAbsolute() {
        return absolute;
    }
}