Package org.apache.xindice.client.xmldb.services

Source Code of org.apache.xindice.client.xmldb.services.XPathQueryServiceImpl

package org.apache.xindice.client.xmldb.services;

/*
* The Apache Software License, Version 1.1
*
*
* Copyright (c) 1999 The Apache Software Foundation.  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 end-user documentation included with the redistribution,
*    if any, must include the following acknowledgment:
*       "This product includes software developed by the
*        Apache Software Foundation (http://www.apache.org/)."
*    Alternately, this acknowledgment may appear in the software itself,
*    if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Xindice" and "Apache Software Foundation" must
*    not be used to endorse or promote products derived from this
*    software without prior written permission. For written
*    permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache",
*    nor may "Apache" appear in their name, without prior written
*    permission of the Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED 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 APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS 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.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation and was
* originally based on software copyright (c) 1999-2001, The dbXML
* Group, L.L.C., http://www.dbxmlgroup.com.  For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
* $Id: XPathQueryServiceImpl.java,v 1.1.1.1 2001/12/06 19:33:54 bradford Exp $
*/

import java.util.*;

import org.apache.xindice.core.FaultCodes;
import org.apache.xindice.client.corba.db.*;
import org.apache.xindice.client.corba.*;
import org.apache.xindice.client.corba.db.Collection;
import org.apache.xindice.client.xmldb.*;

import org.apache.xindice.client.xmldb.resources.*;

import org.apache.xindice.xml.*;
import org.apache.xindice.xml.dom.*;

import org.w3c.dom.*;
import org.xmldb.api.base.*;
import org.xmldb.api.modules.*;

public class XPathQueryServiceImpl extends CommonConfigurable
   implements org.xmldb.api.modules.XPathQueryService
{
   private SymbolDeserializer syms;
   private NamespaceMap nsMap = new NamespaceMap();

   protected org.xmldb.api.base.Collection collection = null;

   public XPathQueryServiceImpl() {
   }

   public String getName() throws XMLDBException {
      return "XPathQueryService";
   }

   public String getVersion() throws XMLDBException {
      return "1.0";
   }

   public void setCollection(org.xmldb.api.base.Collection col)
         throws XMLDBException {
      this.collection = col;
   }

   public void setSymbolDeserializer(SymbolDeserializer syms) {
      this.syms = syms;
   }

   public void setDefaultNamespace(String uri) throws XMLDBException {
      if ( uri != null )
         nsMap.setDefaultNamespace(uri);
      else
         nsMap.removeDefaultNamespace();
   }
  
   public void removeDefaultNamespace() {
      nsMap.removeDefaultNamespace();
   }
  
   public void setNamespace(String prefix, String uri) throws XMLDBException {
      if ( ( prefix == null ) || prefix.equals("") ) {
         setDefaultNamespace(uri);
      }
      else {
         if ( uri != null ) {
            nsMap.setNamespace(prefix, uri);
         }
      }
   }
  
   public void removeNamespace(String prefix) {
      if ( ( prefix == null ) || prefix.equals("") ) {
         removeDefaultNamespace();
      }
     
      nsMap.removeNamespace(prefix);
   }
  
   public String getDefaultNamespace() {
      return nsMap.getDefaultNamespaceURI();
   }
  
   public String getNamespace(String prefix) {
      if ( ( prefix == null ) || prefix.equals("") ) {
         return nsMap.getDefaultNamespaceURI();
      }
  
      return nsMap.getNamespaceURI(prefix);
   }
  
   public void clearNamespaces() {
      nsMap.clear();
   }

   private NamedVal[] getNamespaces() {
      NamedVal[] nv = new NamedVal[nsMap.size()];
      Iterator iter = nsMap.keySet().iterator();
      int i = 0;
      while ( iter.hasNext() ) {
         String prefix = (String)iter.next();
         String uri = nsMap.getNamespaceURI(prefix);
         nv[i++] = new NamedVal(prefix, uri);
      }
      return nv;
   }
  
   /**
    * Executes an XPath query on the server. The results are returned as an
    * ResourceIterator
    *
    * @param query the XPath query string to execute.
    * @exception XMLDBException
    */
   public org.xmldb.api.base.ResourceSet query (String query)
         throws XMLDBException {
      // Get the Xindice collection object from the XML:DB collection wrapper.
      Collection col = ((CollectionImpl) collection).getServerObject();

      ResourceSet result = null;
      try {
         EncodedBuffer buffer = col.queryCollection("XPath", query,
            getNamespaces(), syms.getLastModified());

         if ( buffer.stamp != -1 ) {
            SymbolTable s = syms.getSymbols(buffer);
            result = new ResourceSetImpl(collection, s, buffer.buf);
         }
         else
            result = new ResourceSetImpl(collection,
               EncodedBufferConverter.convertToDocument(buffer));
      }
      catch (Exception e) {
         result = new ResourceSetImpl(collection, null);
      }

      return result;
   }
  
   public org.xmldb.api.base.ResourceSet queryResource (String id, String query)
         throws XMLDBException {
      // Get the Xindice collection object from the XML:DB collection wrapper.
      Collection col = ((CollectionImpl) collection).getServerObject();

      ResourceSet result = null;
      try {
         EncodedBuffer buffer = col.queryDocument("XPath", query,
            getNamespaces(), id, syms.getLastModified());

         if ( buffer.stamp != -1 ) {
            SymbolTable s = syms.getSymbols(buffer);
            result = new ResourceSetImpl(collection, s, buffer.buf);
         }
         else
            result = new ResourceSetImpl(collection,
               EncodedBufferConverter.convertToDocument(buffer));
      }
      catch (Exception e) {
         result = new ResourceSetImpl(collection, null);
      }

      return result;
   }
  
   public XMLResource queryResult(String query) throws XMLDBException {
      Collection col = ((CollectionImpl) collection).getServerObject();

      XMLResource result = null;
      try {
         EncodedBuffer buffer = col.queryCollection("XPath", query, getNamespaces(), syms.getLastModified());

         if ( buffer.stamp != -1 ) {
            SymbolTable s = syms.getSymbols(buffer);
            result = new XMLResourceImpl("", collection, s, buffer.buf);
         }
         else
            result = new XMLResourceImpl("", collection, new String(buffer.buf));
      }
      catch (Exception e) {
         result = null;
      }

      return result;
   }
}

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