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/*
 * Copyright 2015, The Querydsl Team (http://www.querydsl.com/team)
 *
 * 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.querydsl.sql;

import java.io.Serializable;
import java.util.Collections;
import java.util.List;

import org.jetbrains.annotations.Nullable;
import com.querydsl.core.annotations.Immutable;

import com.querydsl.core.BooleanBuilder;
import com.querydsl.core.Tuple;
import com.querydsl.core.types.*;
import com.querydsl.core.types.dsl.BooleanExpression;
import com.querydsl.core.types.dsl.Expressions;
import com.querydsl.core.util.CollectionUtils;

/**
 * {@code ForeignKey} defines a foreign key on a table to another table
 *
 * @author tiwe
 *
 * @param 
 */
@Immutable
public final class ForeignKey implements Serializable, ProjectionRole {

    private static final long serialVersionUID = 2260578033772289023L;

    private final RelationalPath entity;

    private final List> localColumns;

    private final List foreignColumns;

    @Nullable
    private transient volatile Expression mixin;

    public ForeignKey(RelationalPath entity, Path localColumn, String foreignColumn) {
        this(entity, Collections.singletonList(localColumn), Collections.singletonList(foreignColumn));
    }

    public ForeignKey(RelationalPath entity, List> localColumns,
            List foreignColumns) {
        this.entity = entity;
        this.localColumns = CollectionUtils.unmodifiableList(localColumns);
        this.foreignColumns = CollectionUtils.unmodifiableList(foreignColumns);
    }

    public RelationalPath getEntity() {
        return entity;
    }

    public List> getLocalColumns() {
        return localColumns;
    }

    public List getForeignColumns() {
        return foreignColumns;
    }

    @SuppressWarnings("unchecked")
    public Predicate on(RelationalPath entity) {
        BooleanBuilder builder = new BooleanBuilder();
        for (int i = 0; i < localColumns.size(); i++) {
            Expression