/*
* Copyright 2008 Udai Gupta, Ralf Joachim
*
* 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.castor.cpa.query.object;
import java.math.BigDecimal;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Date;
import java.util.Iterator;
import java.util.List;
import org.castor.cpa.query.Condition;
import org.castor.cpa.query.Expression;
import org.castor.cpa.query.Field;
import org.castor.cpa.query.Literal;
import org.castor.cpa.query.Order;
import org.castor.cpa.query.OrderDirection;
import org.castor.cpa.query.Parameter;
import org.castor.cpa.query.Projection;
import org.castor.cpa.query.Schema;
import org.castor.cpa.query.SelectQuery;
import org.castor.cpa.query.TemporalType;
import org.castor.cpa.query.object.literal.BigDecimalLiteral;
import org.castor.cpa.query.object.literal.BooleanLiteral;
import org.castor.cpa.query.object.literal.DoubleLiteral;
import org.castor.cpa.query.object.literal.LongLiteral;
import org.castor.cpa.query.object.literal.StringLiteral;
import org.castor.cpa.query.object.parameter.NamedParameter;
import org.castor.cpa.query.object.parameter.PositionalParameter;
/**
* Final class that implements SelectQuery.
*
* @author <a href="mailto:mailtoud AT gmail DOT com">Udai Gupta</a>
* @author <a href="mailto:ralf DOT joachim AT syscon DOT eu">Ralf Joachim</a>
* @version $Revision: 7121 $ $Date: 2006-04-25 16:09:10 -0600 (Tue, 25 Apr 2006) $
* @since 1.3
*/
public final class SelectQueryImpl extends AbstractQueryObject implements SelectQuery {
//--------------------------------------------------------------------------
/** Do the select query deliver distinct results? */
private boolean _distinct;
/** List of projections of the select query.
* First implementation will only support one projection. */
private final List < Projection > _projections = new ArrayList < Projection > ();
/** List of schemas of the select query.
* First implementation will support only one schema without joins. */
private final List < Schema > _schemas = new ArrayList < Schema > ();
/** Where condition of the select query. */
private Condition _where;
/** Order clause of the select query. */
private Order _order;
/** The number of records to limit result of select query to. */
private Expression _limit;
/** The number of records to offset result of select query to. */
private Expression _offset;
//--------------------------------------------------------------------------
/**
* {@inheritDoc}
*/
public Schema newSchema(final String name, final String identifier) {
return new SchemaImpl(name, identifier);
}
/**
* {@inheritDoc}
*/
public Schema newSchema(final Class < ? > type, final String identifier) {
return new SchemaImpl(type, identifier);
}
/**
* {@inheritDoc}
*/
public Parameter newParameter(final int position) {
return new PositionalParameter(position);
}
/**
* {@inheritDoc}
*/
public Parameter newParameter(final String name) {
return new NamedParameter(name);
}
/**
* {@inheritDoc}
*/
public Literal newBoolean(final boolean value) {
return new BooleanLiteral(value);
}
/**
* {@inheritDoc}
*/
public Literal newNumeric(final long value) {
return new LongLiteral(value);
}
/**
* {@inheritDoc}
*/
public Literal newNumeric(final double value) {
return new DoubleLiteral(value);
}
/**
* {@inheritDoc}
*/
public Literal newNumeric(final BigDecimal value) {
return new BigDecimalLiteral(value);
}
/**
* {@inheritDoc}
*/
public Literal newString(final String value) {
return new StringLiteral(value);
}
/**
* {@inheritDoc}
*/
public Literal newEnum(final Enum < ? > identifier) {
// TODO Auto-generated method stub
return null;
}
/**
* {@inheritDoc}
*/
public Order newOrder(final Field field) {
Order order = new OrderImpl();
order.add(field);
return order;
}
/**
* {@inheritDoc}
*/
public Order newOrder(final Field field, final OrderDirection direction) {
Order order = new OrderImpl();
order.add(field, direction);
return order;
}
/**
* {@inheritDoc}
*/
public Expression newTemporal(final TemporalType temporalType) {
// TODO Auto-generated method stub
return null;
}
/**
* {@inheritDoc}
*/
public Expression newTemporal(final TemporalType temporalType, final Date value) {
// TODO Auto-generated method stub
return null;
}
/**
* {@inheritDoc}
*/
public Expression newTemporal(final TemporalType temporalType, final Calendar value) {
// TODO Auto-generated method stub
return null;
}
//--------------------------------------------------------------------------
/**
* {@inheritDoc}
*/
public void setDistinct(final boolean distinct) {
_distinct = distinct;
}
/**
* {@inheritDoc}
*/
public void addProjection(final Field field) {
_projections.add(new ProjectionImpl(field));
}
/**
* {@inheritDoc}
*/
public void addProjection(final Field field, final String alias) {
_projections.add(new ProjectionImpl(field, alias));
}
/**
* {@inheritDoc}
*/
public void addSchema(final Schema schema) {
_schemas.add(schema);
}
/**
* {@inheritDoc}
*/
public void setWhere(final Condition condition) {
_where = condition;
}
/**
* {@inheritDoc}
*/
public void setOrder(final Order order) {
_order = order;
}
/**
* {@inheritDoc}
*/
public void setLimit(final int limit) {
_limit = new LongLiteral(limit);
_offset = null;
}
/**
* {@inheritDoc}
*/
public void setLimit(final Parameter limit) {
_limit = limit;
_offset = null;
}
/**
* {@inheritDoc}
*/
public void setLimit(final int limit, final int offset) {
_limit = new LongLiteral(limit);
_offset = new LongLiteral(offset);
}
/**
* {@inheritDoc}
*/
public void setLimit(final Parameter limit, final Parameter offset) {
_limit = limit;
_offset = offset;
}
//--------------------------------------------------------------------------
/**
* {@inheritDoc}
*/
public StringBuilder toString(final StringBuilder sb) {
sb.append("SELECT ");
if (_distinct) { sb.append("DISTINCT "); }
for (Iterator < Projection > iter = _projections.iterator(); iter.hasNext(); ) {
iter.next().toFullString(sb);
if (iter.hasNext()) { sb.append(", "); }
}
sb.append(" FROM ");
for (Iterator < Schema > iter = _schemas.iterator(); iter.hasNext(); ) {
iter.next().toFullString(sb);
if (iter.hasNext()) { sb.append(", "); }
}
if (_where != null) {
sb.append(" WHERE ");
_where.toString(sb);
}
if (_order != null) {
sb.append(" ORDER BY ");
_order.toString(sb);
}
if (_limit != null) {
sb.append(" LIMIT ");
_limit.toString(sb);
if (_offset != null) {
sb.append(" OFFSET ");
_offset.toString(sb);
}
}
return sb;
}
//--------------------------------------------------------------------------
}