/*
 * (c) Copyright 2008, 2009 Hewlett-Packard Development Company, LP
 * All rights reserved.
 * [See end of file]
 */

package search;

import java.io.IOException ;
import java.io.InputStream ;
import java.io.InputStreamReader ;
import java.io.Reader ;
import java.net.HttpURLConnection ;
import java.util.Iterator ;

import org.openjena.atlas.iterator.NullIterator ;
import org.openjena.atlas.lib.StrUtils ;

import com.hp.hpl.jena.sparql.util.Convert ;

public abstract class SearchBase implements Search 
{
    @Override
    public final Iterator<String> search(String... words)
    {
        String str = StrUtils.strjoin(" ", words) ;
        str = Convert.encWWWForm(str) ;
        InputStream in = execGet(str) ;
        if ( in == null )
            return new NullIterator<String>() ;
        
        return parse(in) ;
    }
    
    protected abstract InputStream execGet(String searchString) ;
    protected abstract Iterator<String> parse(InputStream in) ;
    
    // Put somewhere!
    public static String readAll(InputStream in, String charset)
    {
        try {
            Reader r = new InputStreamReader(in, charset) ;//FileUtils.asUTF8(in) ;
            StringBuilder sw = new StringBuilder(64*1024);
            char buff[] = new char[8*1024];
            while (true)
            {
                int len = r.read(buff);
                if (len < 0)
                    break;
                sw.append(buff, 0, len);
            }
            r.close();

            return sw.toString();
        } catch (IOException ex)
        {
            throw new SearchException(ex) ;
        }
    }

    
    protected InputStream execCommon(HttpURLConnection httpConnection)
    {
        try {        
            int responseCode = httpConnection.getResponseCode() ;
            String responseMessage = Convert.decWWWForm(httpConnection.getResponseMessage()) ;
            
            // 1xx: Informational 
            // 2xx: Success 
            // 3xx: Redirection 
            // 4xx: Client Error 
            // 5xx: Server Error 
            
            if ( 300 <= responseCode && responseCode < 400 )
                throw new SearchException(responseCode+" "+responseMessage) ;
            
            // Other 400 and 500 - errors 
            if ( responseCode >= 400 )
                throw new SearchException(responseCode+" "+responseMessage) ;
  
            // Request suceeded
            InputStream in = httpConnection.getInputStream() ;
            
//            Map<String, List<String>> x = httpConnection.getHeaderFields() ;
//            for ( String f : x.keySet() )
//                System.out.println(f+" = "+x.get(f)) ;
            
            return in ;
        }
        catch (IOException ioEx)
        {
            throw new SearchException(ioEx) ;
        } 
    }
 
    
}

/*
 * (c) Copyright 2008, 2009 Hewlett-Packard Development Company, LP
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */