iciql/src/main/java/com/iciql/QueryJoin.java

/*
 * 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;

/**
 * This class represents a query with a join.
 */

public class QueryJoin<T> {

    private Query<T> query;
    private SelectTable<T> join;

    QueryJoin(Query<T> query, SelectTable<T> join) {
        this.query = query;
        this.join = join;
    }

    public QueryJoinCondition<T, Boolean> on(boolean x) {
        query.getFrom().getAliasDefinition().checkMultipleBooleans();
        return addPrimitive(x);
    }

    public QueryJoinCondition<T, Byte> on(byte x) {
        return addPrimitive(x);
    }

    public QueryJoinCondition<T, Short> on(short x) {
        return addPrimitive(x);
    }

    public QueryJoinCondition<T, Integer> on(int x) {
        return addPrimitive(x);
    }

    public QueryJoinCondition<T, Long> on(long x) {
        return addPrimitive(x);
    }

    public QueryJoinCondition<T, Float> on(float x) {
        return addPrimitive(x);
    }

    public QueryJoinCondition<T, Double> on(double x) {
        return addPrimitive(x);
    }

    private <A> QueryJoinCondition<T, A> addPrimitive(A x) {
        A alias = query.getPrimitiveAliasByValue(x);
        if (alias == null) {
            // this will result in an unmapped field exception
            return new QueryJoinCondition<T, A>(query, join, x);
        }
        return new QueryJoinCondition<T, A>(query, join, alias);
    }

    public <A> QueryJoinCondition<T, A> on(A x) {
        return new QueryJoinCondition<T, A>(query, join, x);
    }
}