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// BridgeDb,
// An abstraction layer for identifier mapping services, both local and online.
// Copyright 2006-2009 BridgeDb developers
//
// Licensed under the Apache 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.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
package org.bridgedb.rdb.construct;

import org.bridgedb.IDMapperException;
import org.bridgedb.Xref;

/**
 * Interface for constructing a gene database.
 */
public interface GdbConstruct 
{

	/**
	 * Returns the most recent {@link Exception} caused by a {@link #addGene(Xref)},
	 * {@link #addAttribute(Xref, String, String)}, or {@link #addLink(Xref, Xref)} call.
	 * It returns null if no such recent call was made and if that
	 * recent call returned 0.
	 */
	public Exception recentException();
	
	/**
	 * Add a biological entity to the database.
	 * @param ref entity to add
	 * @return 1 if addition was successful, 0 otherwise. 
	 */
	public int addGene(Xref ref);

	/**
	 * Add an attribute for a biological entity to the database.
	 * @param ref entity to add
	 * @param attr key
	 * @param val value
	 * @return 1 if addition was successful, 0 otherwise. 
	 */
    public int addAttribute(Xref ref, String attr, String val);

	/**
	 * Add a link between two refs to the database.
	 * @param left left part of relationship
	 * @param right right part of relationship
	 * @return 1 if addition was successful, 0 otherwise. 
	 */
    public int addLink(Xref left, Xref right);
    
    /** 
     * Set a database info property 
     * @throws IDMapperException 
     */
    public void setInfo(String key, String value) throws IDMapperException;
    
	/**
	   Create indices on the database
	   You can call this at any time after creating the tables,
	   but it is good to do it only after inserting all data.
	   @throws IDMapperException on failure
	 */
	public void createGdbIndices() throws IDMapperException;   

	/**
	   prepare for inserting genes and/or links.
	   @throws IDMapperException on failure
	 */
	public void preInsert() throws IDMapperException;
	
	/**
	 * Excecutes several SQL statements to create the tables and indexes in the database the given
	 * connection is connected to.
	 */
	abstract public void createGdbTables() throws IDMapperException;	

	abstract public void commit() throws IDMapperException;
	
	abstract public void finalize() throws IDMapperException;
}