pl.softech.eav.domain.relation.Relation.java Source code

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Here is the source code for pl.softech.eav.domain.relation.Relation.java

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/*
 * Copyright 2013 Sawomir led <slawomir.sledz@sof-tech.pl>.
 *
 * 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 pl.softech.eav.domain.relation;

import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkNotNull;

import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.Table;

import org.apache.commons.lang3.builder.ToStringBuilder;
import org.apache.commons.lang3.builder.ToStringStyle;

import pl.softech.eav.domain.AbstractEntity;
import pl.softech.eav.domain.object.MyObject;
import pl.softech.eav.domain.specification.OwnerRelationSpecification;
import pl.softech.eav.domain.specification.TargetRelationSpecification;

/**
 * @author Sawomir led <slawomir.sledz@sof-tech.pl>
 * @since 1.0
 */
@Entity(name = "pl.softech.eav.domain.relation.Relation")
@Table(name = "eav_relation")
public class Relation extends AbstractEntity {

    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "rel_cnf_id", nullable = false)
    private RelationConfiguration configuration;

    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "owner_id", nullable = false)
    private MyObject owner;

    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "target_id")
    //nullable is true because target can be persisted before relation
    private MyObject target;

    protected Relation() {
    }

    public Relation(RelationConfiguration configurarion, MyObject owner, MyObject target) {

        this.configuration = checkNotNull(configurarion, ARG_NOT_NULL_CHECK, "configuration");
        this.owner = checkNotNull(owner, ARG_NOT_NULL_CHECK, "owner");
        this.target = checkNotNull(target, ARG_NOT_NULL_CHECK, "target");

        checkArgument(new TargetRelationSpecification(configurarion).isSafisfiedBy(target));
        checkArgument(new OwnerRelationSpecification(configurarion).isSafisfiedBy(owner));

    }

    public RelationConfiguration getConfiguration() {
        return configuration;
    }

    public MyObject getTarget() {
        return target;
    }

    @Override
    public String toString() {
        ToStringBuilder sb = new ToStringBuilder(this, ToStringStyle.SHORT_PREFIX_STYLE);
        sb.appendSuper(super.toString());
        sb.append(configuration);
        sb.append("owner", owner);
        sb.append("target", target);
        return sb.toString();
    }

}