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/*
* Copyright 2004-2011 H2 Group.
* Copyright 2011 James Moger.
*
* 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 com.iciql;
import java.util.List;
/**
* This class represents a query with a condition.
*
* @param <T>
* the return type
*/
public class QueryWhere<T> {
Query<T> query;
QueryWhere(Query<T> query) {
this.query = query;
}
public <A> QueryCondition<T, A> and(A x) {
query.addConditionToken(ConditionAndOr.AND);
return new QueryCondition<T, A>(query, x);
}
public <A> QueryCondition<T, A> or(A x) {
query.addConditionToken(ConditionAndOr.OR);
return new QueryCondition<T, A>(query, x);
}
public QueryWhere<T> limit(long limit) {
query.limit(limit);
return this;
}
public QueryWhere<T> offset(long offset) {
query.offset(offset);
return this;
}
public <X, Z> List<X> select(Z x) {
return query.select(x);
}
public String getSQL() {
SQLStatement stat = new SQLStatement(query.getDb());
stat.appendSQL("SELECT *");
query.appendFromWhere(stat);
return stat.getSQL().trim();
}
public <X, Z> List<X> selectDistinct(Z x) {
return query.selectDistinct(x);
}
public <X, Z> X selectFirst(Z x) {
List<X> list = query.select(x);
return list.isEmpty() ? null : list.get(0);
}
public List<T> select() {
return query.select();
}
public T selectFirst() {
List<T> list = select();
return list.isEmpty() ? null : list.get(0);
}
public List<T> selectDistinct() {
return query.selectDistinct();
}
/**
* Order by a number of columns.
*
* @param expressions
* the order by expressions
* @return the query
*/
public QueryWhere<T> orderBy(Object... expressions) {
for (Object expr : expressions) {
OrderExpression<T> e = new OrderExpression<T>(query, expr, false, false, false);
query.addOrderBy(e);
}
return this;
}
public QueryWhere<T> orderByNullsFirst(Object expr) {
OrderExpression<T> e = new OrderExpression<T>(query, expr, false, true, false);
query.addOrderBy(e);
return this;
}
public QueryWhere<T> orderByNullsLast(Object expr) {
OrderExpression<T> e = new OrderExpression<T>(query, expr, false, false, true);
query.addOrderBy(e);
return this;
}
public QueryWhere<T> orderByDesc(Object expr) {
OrderExpression<T> e = new OrderExpression<T>(query, expr, true, false, false);
query.addOrderBy(e);
return this;
}
public QueryWhere<T> orderByDescNullsFirst(Object expr) {
OrderExpression<T> e = new OrderExpression<T>(query, expr, true, true, false);
query.addOrderBy(e);
return this;
}
public QueryWhere<T> orderByDescNullsLast(Object expr) {
OrderExpression<T> e = new OrderExpression<T>(query, expr, true, false, true);
query.addOrderBy(e);
return this;
}
public int delete() {
return query.delete();
}
public int update() {
return query.update();
}
public long selectCount() {
return query.selectCount();
}
}
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