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* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
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* http://www.apache.org/licenses/LICENSE-2.0
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package org.apache.cayenne.access.jdbc;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Set;
import org.apache.cayenne.CayenneRuntimeException;
import org.apache.cayenne.dba.TypesMapping;
import org.apache.cayenne.ejbql.EJBQLBaseVisitor;
import org.apache.cayenne.ejbql.EJBQLExpression;
import org.apache.cayenne.map.DbAttribute;
import org.apache.cayenne.map.DbEntity;
import org.apache.cayenne.map.DbJoin;
import org.apache.cayenne.map.DbRelationship;
import org.apache.cayenne.map.ObjAttribute;
import org.apache.cayenne.map.ObjRelationship;
import org.apache.cayenne.reflect.ArcProperty;
import org.apache.cayenne.reflect.AttributeProperty;
import org.apache.cayenne.reflect.ClassDescriptor;
import org.apache.cayenne.reflect.PropertyVisitor;
import org.apache.cayenne.reflect.ToManyProperty;
import org.apache.cayenne.reflect.ToOneProperty;
/**
* @since 3.0
* @author Andrus Adamchik
*/
class EJBQLIdentifierColumnsTranslator extends EJBQLBaseVisitor {
private EJBQLTranslationContext context;
private Set columns;
EJBQLIdentifierColumnsTranslator(EJBQLTranslationContext context) {
this.context = context;
}
public boolean visitIdentifier(EJBQLExpression expression) {
final String idVar = expression.getText();
// append all table columns
ClassDescriptor descriptor = context.getEntityDescriptor(idVar);
PropertyVisitor visitor = new PropertyVisitor() {
public boolean visitAttribute(AttributeProperty property) {
ObjAttribute oa = property.getAttribute();
Iterator dbPathIterator = oa.getDbPathIterator();
while (dbPathIterator.hasNext()) {
Object pathPart = dbPathIterator.next();
if (pathPart == null) {
throw new CayenneRuntimeException(
"ObjAttribute has no component: " + oa.getName());
}
else if (pathPart instanceof DbRelationship) {
// DbRelationship rel = (DbRelationship) pathPart;
// dbRelationshipAdded(rel);
}
else if (pathPart instanceof DbAttribute) {
DbAttribute dbAttr = (DbAttribute) pathPart;
appendColumn(idVar, dbAttr, oa.getType());
}
}
return true;
}
public boolean visitToMany(ToManyProperty property) {
visitRelationship(property);
return true;
}
public boolean visitToOne(ToOneProperty property) {
visitRelationship(property);
return true;
}
private void visitRelationship(ArcProperty property) {
ObjRelationship rel = property.getRelationship();
DbRelationship dbRel = (DbRelationship) rel.getDbRelationships().get(0);
List joins = dbRel.getJoins();
int len = joins.size();
for (int i = 0; i < len; i++) {
DbJoin join = (DbJoin) joins.get(i);
DbAttribute src = join.getSource();
appendColumn(idVar, src);
}
}
};
// EJBQL queries are polimorphic by definition - there is no distinction between
// inheritance/no-inheritance fetch
descriptor.visitAllProperties(visitor);
// append id columns ... (some may have been appended already via relationships)
DbEntity table = descriptor.getEntity().getDbEntity();
Iterator it = table.getPrimaryKey().iterator();
while (it.hasNext()) {
DbAttribute pk = (DbAttribute) it.next();
appendColumn(idVar, pk);
}
return false;
}
private void appendColumn(String identifier, DbAttribute column) {
appendColumn(identifier, column, null);
}
private void appendColumn(String identifier, DbAttribute column, String javaType) {
DbEntity table = (DbEntity) column.getEntity();
String alias = context.getTableAlias(identifier, table.getFullyQualifiedName());
String columnName = alias + "." + column.getName();
Set columns = getColumns();
if (columns.add(columnName)) {
context.append(columns.size() > 1 ? ", " : " ");
if (context.isAppendingResultColumns()) {
context.append("#result('");
}
context.append(columnName);
if (context.isAppendingResultColumns()) {
if (javaType == null) {
javaType = TypesMapping.getJavaBySqlType(column.getType());
}
// TODO: andrus 6/27/2007 - the last parameter is an unofficial "jdbcType"
// pending CAY-813 implementation, switch to #column directive
context.append("' '").append(javaType).append("' '").append(
column.getName()).append("' '").append(column.getName()).append(
"' " + column.getType()).append(")");
}
}
}
private Set getColumns() {
if (columns == null) {
columns = new HashSet();
}
return columns;
}
}