CommandPlanner.java

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package org.teiid.query.optimizer;

import org.teiid.api.exception.query.QueryMetadataException;
import org.teiid.api.exception.query.QueryPlannerException;
import org.teiid.core.TeiidComponentException;
import org.teiid.core.id.IDGenerator;
import org.teiid.query.analysis.AnalysisRecord;
import org.teiid.query.metadata.QueryMetadataInterface;
import org.teiid.query.optimizer.capabilities.CapabilitiesFinder;
import org.teiid.query.processor.ProcessorPlan;
import org.teiid.query.sql.lang.Command;
import org.teiid.query.util.CommandContext;


/**
 * <p>The common interface of all planners which take a user's command 
 * object and produce a 
 * {@link org.teiid.query.processor.ProcessorPlan ProcessorPlan} 
 * object, which is a plan for executing the query.</p>
 */
public interface CommandPlanner {
	
	/**
	 * Allows the planner a chance to optimize the canonical plan(s) stored in
	 * the CommandTreeNode tree.  This method should be called in a bottom-up
	 * manner; from leaf nodes up to the root node.
	 * @param command TODO
	 * @param metadata source of metadata
	 * @param capFinder Class usable to find the connector capabilities for a particular model
	 * @param context 
	 * @param debug whether or not to generate verbose debug output during planning
	 * @return ProcessorPlan implementation specific to the CommandPlanner
     * @throws QueryPlannerException indicating a problem in planning
     * @throws QueryMetadataException indicating an exception in accessing the metadata
     * @throws TeiidComponentException indicating an unexpected exception
	 */
	ProcessorPlan optimize(Command command, IDGenerator idGenerator, QueryMetadataInterface metadata, CapabilitiesFinder capFinder, AnalysisRecord analysisRecord, CommandContext context)
	throws QueryPlannerException, QueryMetadataException, TeiidComponentException;

}