//$Id: QueryJoinFragment.java 4889 2004-12-05 17:20:21Z pgmjsd $
package org.hibernate.sql;
import org.hibernate.dialect.Dialect;
/**
* A join that appears in a translated HQL query
*
* @author Gavin King
*/
public class QueryJoinFragment extends JoinFragment {
private StringBuffer afterFrom = new StringBuffer();
private StringBuffer afterWhere = new StringBuffer();
private Dialect dialect;
private boolean useThetaStyleInnerJoins;
public QueryJoinFragment(Dialect dialect, boolean useThetaStyleInnerJoins) {
this.dialect = dialect;
this.useThetaStyleInnerJoins = useThetaStyleInnerJoins;
}
public void addJoin(String tableName, String alias, String[] fkColumns, String[] pkColumns, int joinType) {
addJoin( tableName, alias, alias, fkColumns, pkColumns, joinType, null );
}
public void addJoin(String tableName, String alias, String[] fkColumns, String[] pkColumns, int joinType, String on) {
addJoin( tableName, alias, alias, fkColumns, pkColumns, joinType, on );
}
private void addJoin(String tableName, String alias, String concreteAlias, String[] fkColumns, String[] pkColumns, int joinType, String on) {
if ( !useThetaStyleInnerJoins || joinType != INNER_JOIN ) {
JoinFragment jf = dialect.createOuterJoinFragment();
jf.addJoin( tableName, alias, fkColumns, pkColumns, joinType, on );
addFragment( jf );
}
else {
addCrossJoin( tableName, alias );
addCondition( concreteAlias, fkColumns, pkColumns );
addCondition( on );
}
}
public String toFromFragmentString() {
return afterFrom.toString();
}
public String toWhereFragmentString() {
return afterWhere.toString();
}
public void addJoins(String fromFragment, String whereFragment) {
afterFrom.append( fromFragment );
afterWhere.append( whereFragment );
}
public JoinFragment copy() {
QueryJoinFragment copy = new QueryJoinFragment( dialect, useThetaStyleInnerJoins );
copy.afterFrom = new StringBuffer( afterFrom.toString() );
copy.afterWhere = new StringBuffer( afterWhere.toString() );
return copy;
}
public void addCondition(String alias, String[] columns, String condition) {
for ( int i = 0; i < columns.length; i++ ) {
afterWhere.append( " and " )
.append( alias )
.append( '.' )
.append( columns[i] )
.append( condition );
}
}
public void addCrossJoin(String tableName, String alias) {
afterFrom.append( ", " )
.append( tableName )
.append( ' ' )
.append( alias );
}
public void addCondition(String alias, String[] fkColumns, String[] pkColumns) {
for ( int j = 0; j < fkColumns.length; j++ ) {
afterWhere.append( " and " )
.append( fkColumns[j] )
.append( '=' )
.append( alias )
.append( '.' )
.append( pkColumns[j] );
}
}
/**
* Add the condition string to the join fragment.
*
* @param condition
* @return true if the condition was added, false if it was already in the fragment.
*/
public boolean addCondition(String condition) {
// if the condition is not already there...
if (
afterFrom.toString().indexOf( condition.trim() ) < 0 &&
afterWhere.toString().indexOf( condition.trim() ) < 0
) {
if ( !condition.startsWith( " and " ) ) {
afterWhere.append( " and " );
}
afterWhere.append( condition );
return true;
}
else {
return false;
}
}
public void addFromFragmentString(String fromFragmentString) {
afterFrom.append( fromFragmentString );
}
public void clearWherePart() {
afterWhere.setLength( 0 );
}
}
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