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SyntheticAndFactory.javaAPI DocHibernate 3.2.54883Mon Dec 05 17:18:36 GMT 2005org.hibernate.hql.ast.util

SyntheticAndFactory

public class SyntheticAndFactory extends Object implements org.hibernate.hql.antlr.HqlSqlTokenTypes
Creates synthetic and nodes based on the where fragment part of a JoinSequence.
author
josh Dec 5, 2004 12:25:20 PM

Fields Summary
private static final Log
log
private antlr.ASTFactory
astFactory
private antlr.collections.AST
thetaJoins
private antlr.collections.AST
filters
Constructors Summary
public SyntheticAndFactory(antlr.ASTFactory astFactory)


	   
		this.astFactory = astFactory;
Methods Summary
public voidaddDiscriminatorWhereFragment(org.hibernate.hql.ast.tree.RestrictableStatement statement, org.hibernate.persister.entity.Queryable persister, java.util.Map enabledFilters, java.lang.String alias)

		String whereFragment = persister.filterFragment( alias, enabledFilters ).trim();
		if ( "".equals( whereFragment ) ) {
			return;
		}
		if ( whereFragment.startsWith( "and" ) ) {
			whereFragment = whereFragment.substring( 4 );
		}

		// Need to parse off the column qualifiers; this is assuming (which is true as of now)
		// that this is only used from update and delete HQL statement parsing
		whereFragment = StringHelper.replace( whereFragment, persister.generateFilterConditionAlias( alias ) + ".", "" );

		// Note: this simply constructs a "raw" SQL_TOKEN representing the
		// where fragment and injects this into the tree.  This "works";
		// however it is probably not the best long-term solution.
		//
		// At some point we probably want to apply an additional grammar to
		// properly tokenize this where fragment into constituent parts
		// focused on the operators embedded within the fragment.
		AST discrimNode = astFactory.create( SQL_TOKEN, whereFragment );

		if ( statement.getWhereClause().getNumberOfChildren() == 0 ) {
			statement.getWhereClause().setFirstChild( discrimNode );
		}
		else {
			AST and = astFactory.create( AND, "{and}" );
			AST currentFirstChild = statement.getWhereClause().getFirstChild();
			and.setFirstChild( discrimNode );
			and.addChild( currentFirstChild );
			statement.getWhereClause().setFirstChild( and );
		}
public voidaddWhereFragment(org.hibernate.sql.JoinFragment joinFragment, java.lang.String whereFragment, org.hibernate.hql.ast.tree.QueryNode query, org.hibernate.hql.ast.tree.FromElement fromElement)


		if ( whereFragment == null ) {
			return;
		}

		whereFragment = whereFragment.trim();
		if ( StringHelper.isEmpty( whereFragment ) ) {
			return;
		}
		else if ( !fromElement.useWhereFragment() && !joinFragment.hasThetaJoins() ) {
			return;
		}

		// Forcefully remove leading ands from where fragments; the grammar will
		// handle adding them
		if ( whereFragment.startsWith( "and" ) ) {
			whereFragment = whereFragment.substring( 4 );
		}

		if ( log.isDebugEnabled() ) log.debug( "Using WHERE fragment [" + whereFragment + "]" );

		SqlFragment fragment = ( SqlFragment ) ASTUtil.create( astFactory, SQL_TOKEN, whereFragment );
		fragment.setJoinFragment( joinFragment );
		fragment.setFromElement( fromElement );

		// Filter conditions need to be inserted before the HQL where condition and the
		// theta join node.  This is because org.hibernate.loader.Loader binds the filter parameters first,
		// then it binds all the HQL query parameters, see org.hibernate.loader.Loader.processFilterParameters().
		if ( fragment.getFromElement().isFilter() || fragment.hasFilterCondition() ) {
			if ( filters == null ) {
				// Find or create the WHERE clause
				AST where = query.getWhereClause();
				// Create a new FILTERS node as a parent of all filters
				filters = astFactory.create( FILTERS, "{filter conditions}" );
				// Put the FILTERS node before the HQL condition and theta joins
				ASTUtil.insertChild( where, filters );
			}
			
			// add the current fragment to the FILTERS node
			filters.addChild( fragment );
		}
		else {
			if ( thetaJoins == null ) {
				// Find or create the WHERE clause
				AST where = query.getWhereClause();
				// Create a new THETA_JOINS node as a parent of all filters
				thetaJoins = astFactory.create( THETA_JOINS, "{theta joins}" );
				// Put the THETA_JOINS node before the HQL condition, after the filters.
				if (filters==null) {
					ASTUtil.insertChild( where, thetaJoins );
				}
				else {
					ASTUtil.insertSibling( thetaJoins, filters );
				}
			}
			
			// add the current fragment to the THETA_JOINS node
			thetaJoins.addChild(fragment);
		}