/*
 * (c) Copyright 2007, 2008, 2009 Hewlett-Packard Development Company, LP
 * All rights reserved.
 * [See end of file]
 */

package com.hp.hpl.jena.sdb.layout2.hash;

import com.hp.hpl.jena.sdb.layout2.TupleLoaderBase;
import com.hp.hpl.jena.sdb.sql.SDBConnection;
import com.hp.hpl.jena.sdb.store.TableDesc;

public abstract class TupleLoaderHashBase extends TupleLoaderBase {

	public TupleLoaderHashBase(SDBConnection connection,
			TableDesc tableDesc, int chunkSize) {
		super(connection, tableDesc, chunkSize);
	}
	
	public String getLoadTuples() {
		StringBuilder stmt = new StringBuilder();
		
		stmt.append("INSERT INTO ").append(this.getTableName()).append(" \nSELECT DISTINCT ");
		for (int i = 0; i < this.getTableWidth(); i++) {
			if (i != 0) stmt.append(" , ");
			stmt.append(getTupleLoader()).append(".").append("t").append(i);
		}
		stmt.append("\nFROM ").append(getTupleLoader()).append(" LEFT JOIN ").append(this.getTableName()).append(" ON \n (");
		for (int i = 0; i < this.getTableWidth(); i++) {
			if (i != 0) stmt.append(" AND ");
			stmt.append("t").append(i);
			stmt.append("=").append(this.getTableName()).append(".").append(this.getTableDesc().getColNames().get(i));
		}
		stmt.append(")\nWHERE\n");
		for (int i = 0; i < this.getTableWidth(); i++) {
			if (i != 0) stmt.append(" OR\n");
			stmt.append(this.getTableName()).append(".").append(this.getTableDesc().getColNames().get(i)).append(" IS NULL");
		}
		
		return stmt.toString();
	}
	
	public String getDeleteTuples() {
		StringBuilder stmt = new StringBuilder();
		
		stmt.append("DELETE FROM ").append(this.getTableName()).append(" \nWHERE\n");
		for (int i = 0; i < this.getTableWidth(); i++) {
			if (i != 0) stmt.append(" AND\n");
			stmt.append(this.getTableDesc().getColNames().get(i)).append(" = ?");
		}
		
		return stmt.toString();
	}
	
	public String getDeleteAllTuples() {
		StringBuilder stmt = new StringBuilder();
		
		stmt.append("DELETE FROM ").append(this.getTableName());
		if (this.getTableWidth() != 3) { // not a triple table, delete based on first column
			stmt.append(" \nWHERE\n");
			stmt.append(getTableDesc().getColNames().get(0));
			stmt.append(" = ? ");
		}
		
		return stmt.toString();
	}
}

/*
 * (c) Copyright 2007, 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.
 */