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72 lines
2.2 KiB
Java
72 lines
2.2 KiB
Java
/*
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* Copyright 2011, Mysema Ltd
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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* http://www.apache.org/licenses/LICENSE-2.0
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.mysema.query.sql;
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import java.util.Arrays;
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import java.util.List;
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import com.mysema.query.QueryMetadata;
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import com.mysema.query.types.Expression;
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import com.mysema.query.types.Ops;
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import com.mysema.query.types.SubQueryExpression;
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import com.mysema.query.types.expr.BooleanExpression;
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import com.mysema.query.types.expr.SimpleExpression;
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import com.mysema.query.types.expr.SimpleOperation;
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import com.mysema.query.types.template.NumberTemplate;
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/**
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* SQLSubQuery is a subquery implementation for SQL queries
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*
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* @author tiwe
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*
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*/
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public class SQLSubQuery extends AbstractSQLSubQuery<SQLSubQuery> implements SQLCommonQuery<SQLSubQuery>{
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public SQLSubQuery() {
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super();
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}
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public SQLSubQuery(QueryMetadata metadata) {
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super(metadata);
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}
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@SuppressWarnings({ "unchecked", "rawtypes" })
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public <T> SimpleExpression<T> union(List<? extends SubQueryExpression<T>> sq) {
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Expression<T> rv = sq.get(0);
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for (int i = 1; i < sq.size(); i++) {
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rv = SimpleOperation.create((Class)rv.getType(), SQLTemplates.UNION, rv, sq.get(i));
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}
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if (rv instanceof SimpleExpression) {
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return (SimpleExpression<T>)rv;
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} else {
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return SimpleOperation.create((Class)rv.getType(), Ops.DELEGATE, rv);
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}
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}
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public <T> SimpleExpression<T> union(SubQueryExpression<T>... sq) {
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return union(Arrays.asList(sq));
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}
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@Override
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public BooleanExpression exists() {
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return unique(NumberTemplate.ONE).exists();
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}
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@Override
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public BooleanExpression notExists() {
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return exists().not();
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}
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}
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