rtreeclient.java

移动对象空间数据库中索引r树源码,能在eclipse下直接运行.

/*
  PROGRAMME:
  PROGRAMMER:
  DATE:
  PROJECT:
  MODIFIED DATE:

*/
package rtree;

import java.io.*;
import java.util.Vector;
import java.net.*;

public class RTreeClient 
{
  private Socket socket;
  public RTreeClient(String host,int port)
  {
    try
      {
        socket=new Socket(host,port);
      }
    catch(Exception e)
      {
        e.printStackTrace();
      }
  }
  public void insert(Element element) throws RTreeException
  {
    try
      {
        String command="insert";
        Object obj[]={element};
        sendRequest(command,obj);
      }
    catch(RTreeException e)
      {
        throw e;
      }
  }
  public void delete(LeafElement element) throws RTreeException
  {
    try
      {
        String command="delete";
        Object obj[]={element};
        sendRequest(command,obj);
      }
    catch(RTreeException e)
      {
        throw e;
      }
  }
  public Vector overlaps(Rect rect) throws RTreeException
  {
    try
      {
        String command="overlaps";
        Object obj[]={rect};
        Object[] response=sendRequest(command,obj);
        return (Vector) response[0];
      }
    catch(RTreeException e)
      {
        throw e;
      }
  }
  public Vector nonDisjoint(Rect rect) throws RTreeException
  {
    try
      {
        String command="nondisjoint";
        Object obj[]={rect};
        Object[] response=sendRequest(command,obj);
        return (Vector) response[0];
      }
    catch(RTreeException e)
      {
        throw e;
      }
  }
  public Vector containedBy(Rect rect) throws RTreeException
  {
    try
      {
        String command="containedby";
        Object obj[]={rect};
        Object[] response=sendRequest(command,obj);
        return (Vector) response[0];
      }
    catch(RTreeException e)
      {
        throw e;
      }
  }
  public Vector equal(Rect rect) throws RTreeException
  {
    try
      {
        String command="equal";
        Object obj[]={rect};
        Object[] response=sendRequest(command,obj);
        return (Vector) response[0];
      }
    catch(RTreeException e)
      {
        throw e;
      }
  }
  public Vector meet(Rect rect) throws RTreeException
  {
    try
      {
        String command="meet";
        Object obj[]={rect};
        Object[] response=sendRequest(command,obj);
        return (Vector) response[0];
      }
    catch(RTreeException e)
      {
        throw e;
      }
  }
  public Vector contains(Rect rect) throws RTreeException
  {
    try
      {
        String command="contains";
        Object obj[]={rect};
        Object[] response=sendRequest(command,obj);
        return (Vector) response[0];
      }
    catch(RTreeException e)
      {
        throw e;
      }
  }
  public Vector getAllElements() throws RTreeException
  {
    try
      {
        String command="getallelements";
        Object[] response=sendRequest(command,null);
        Vector v=(Vector)response[0];
        return (Vector) response[0];
      }
    catch(RTreeException e)
      {
        throw e;
      }
  }
  public Rect getTreeMBR() throws RTreeException
  {
    try
      {
        String command="gettreembr";
        Object[] response=sendRequest(command,null);
        return (Rect) response[0];
      }
    catch(RTreeException e)
      {
        throw e;
      }
  }
  public ABL[] nearestSearch(Point pt,long ln,int in) throws RTreeException
  {
    try
      {
        String command="nearest";
        Object obj[]={pt,new Long(ln),new Integer(in)};
        Object[] response=sendRequest(command,obj);
        if(response!=null)
          {
            ABL abl[]=new ABL[response.length];
            for(int i=0;i<response.length;i++)
              {
                abl[i]=(ABL)response[i];
              }
            return abl;
          }     
        else
          return null;

      }
    catch(RTreeException e)
      {
        throw e;
      }
  }
  public Vector nearestSearch(Point pt,long ln) throws RTreeException
  {
    try
      {
        String command="nearestsearch";
        Object obj[]={pt,new Long(ln)};
        Object[] response=sendRequest(command,obj);
        return (Vector) response[0];
      }
    catch(RTreeException e)
      {
        throw e;
      }
  }
  private Object[] sendRequest(String command,Object[] param) throws RTreeException
  {
    try
      {
        ByteArrayOutputStream bout=new ByteArrayOutputStream ();
        ObjectOutputStream out=new ObjectOutputStream (bout);
        //                      ObjectOutputStream out=new ObjectOutputStream(socket.getOutputStream());
        OutputStream fout=socket.getOutputStream ();
        out.writeObject(command);
        if(param!=null)
          {
            out.writeObject(new Integer (param.length));
            for(int i=0;i<param.length;i++)
              {
                out.writeObject(param[i]);
              }
          }
        else
          {
            out.writeObject(new Integer(0));
          }
        //                      out.flush();
        out.close();
        //long time = System.currentTimeMillis();
        fout.write(bout.toByteArray());
        fout.flush();
        //                      InputStream in=socket.getInputStream();
        /*
          while(in.available()==0)
          {
          Thread.sleep(10);
          }
          int rTotal=in.available();
          System.out.println("RTotal..........."+rTotal);
          byte[] bb=new byte[in.available()];
          in.read(bb,0,in.available());
          byte ln[]=new byte[10];
          System.arraycopy(bb,0,ln,0,10);
          ByteArrayInputStream lin=new ByteArrayInputStream(ln);
          ObjectInputStream loin=new ObjectInputStream(lin);
          int total=loin.readInt();
          byte bbf[]=new byte[rTotal];
          System.out.println(total+"..."+bbf.length);
          System.arraycopy(bb,10,bbf,0,rTotal-10);
          int pos=bbf.length;
          System.out.println("Postion................."+pos);
          while(rTotal<total)
          {
          int avail=in.available();
          while(avail==0)
          {
          avail=in.available();
          }
          byte temp[]=new byte[avail];
          in.read(temp,0,avail);
          byte temp1[]=new byte[avail+bbf.length];
          System.arraycopy(bbf,0,temp1,0,bbf.length);
          System.arraycopy(temp,0,temp1,bbf.length,temp.length);
          bbf=temp1;
          rTotal+=avail;
          System.out.println(bbf.length+"______________________");
          System.arraycopy(temp,0,bbf,pos,temp.length);
          pos+=avail;
          Thread.sleep(10);
          }

          
        */
        
        
        InputStream in=socket.getInputStream();
        //System.out.println("RTreeClient.sendRequest : time to receive response " 
        //+ (System.currentTimeMillis() - time));
        //time = System.currentTimeMillis();

        byte bbf[]=new byte[100];

        int i=0;
        int total=-1;
        while(true)
          {
            int val=in.read(bbf,i,1);
            if(val==-1)
              break;
            i++;
            if(i==10)
              {
                byte ln[]=new byte[10];
                System.arraycopy(bbf,0,ln,0,10);
                ByteArrayInputStream lin=new ByteArrayInputStream(ln);
                ObjectInputStream loin=new ObjectInputStream(lin);
                total=loin.readInt();
                byte temp[]=new byte[total];
                System.arraycopy(bbf,0,temp,0,bbf.length);
                bbf=temp;
              }
            if(i>=total && total!=-1)
              {
                //System.out.println("read completed..."+bbf.length);
                break;
              }
          }

        byte tby[]=new byte[bbf.length-10];
        System.arraycopy(bbf,10,tby,0,tby.length);
        ByteArrayInputStream bin=new ByteArrayInputStream(tby);
        ObjectInputStream oIn=new ObjectInputStream(bin);
        Boolean bool=(Boolean) oIn.readObject();
        //System.out.println("boolean.........."+bool);
        Integer count=(Integer) oIn.readObject();
        //System.out.println("count.........."+count);
        if(bool.booleanValue())
          {
            Object[] obj=new Object[count.intValue()];
            for(int j=0;j<count.intValue();j++)
              {
                obj[j]=oIn.readObject();
              }
            //                              oIn.close();
            //System.out.println("RTreeClient.sendRequest : time to process input data " 
            //         + (System.currentTimeMillis() - time));
            
            return obj;
          }
        else
          {
            throw (Exception) oIn.readObject();
          }
      }
    catch(Exception e)
      {
        e.printStackTrace();
        throw new RTreeException(e.getMessage());
      }
  }
  /**
     public static void main(String args[])
     {

     try
     {
     RTreeClient cln=new RTreeClient("localhost",7001);
     System.out.println("Connection established1...");
     Rect rect=cln.getTreeMBR();
     System.out.println("........."+rect);
     Vector v=cln.getAllElements();//contains(new Rect(0,0,1000,1000));
     System.out.println(v.size());
     System.out.println(v.get(0));
     }
     catch(Exception e)
     {
     e.printStackTrace();
     }
     } */
}