de.mhus.lib.adb.relation.RelMultible Maven / Gradle / Ivy

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/**
 * Copyright 2018 Mike Hummel
 *
 * 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 de.mhus.lib.adb.relation;

import de.mhus.lib.adb.IRelationObject;
import de.mhus.lib.adb.model.Field;
import de.mhus.lib.adb.model.FieldRelation;
import de.mhus.lib.core.parser.AttributeMap;
import de.mhus.lib.sql.DbConnection;

/**
 * RelMultible class.
 *
 * @author mikehummel
 * @version $Id: $Id
 * @param 
 */
public class RelMultible implements IRelationObject {

    private FieldRelation field;
    private Object obj;
    private RelList relations;

    /**
     * Getter for the field relations.
     *
     * @return a {@link de.mhus.lib.adb.relation.RelList} object.
     * @throws java.lang.Exception if any.
     */
    public RelList getRelations() throws Exception {
        synchronized (this) {
            if (relations == null) {

                Class target = field.getConfig().target();
                String src = field.getConfig().sourceAttribute();
                if ("".equals(src)) src = "id";
                src = src.toLowerCase();

                String tar = field.getConfig().targetAttribute();
                if ("".equals(tar)) tar = field.getName() + "id";
                // tar = tar.toLowerCase();

                String order = "";
                if (!"".equals(field.getConfig().orderBy())) {
                    order =
                            " ORDER BY $db."
                                    + field.getManager().getMappingName(target)
                                    + "."
                                    + field.getConfig().orderBy()
                                    + "$";
                }

                Field idField = field.getTable().getField(src);
                if (idField == null) return null;
                Object id = idField.getFromTarget(obj);
                if (id == null) return null;
                relations =
                        new RelList(
                                field.getManager()
                                        .getByQualification(
                                                target,
                                                "$db."
                                                        + field.getManager()
                                                                .getMappingName(
                                                                        field.getConfig().target())
                                                        + "."
                                                        + tar
                                                        + "$ = $id$"
                                                        + order,
                                                new AttributeMap("id", id))
                                        .toCacheAndClose(),
                                field.getConfig());
            }
        }
        return relations;
    }

    /** reset. */
    public void reset() {
        synchronized (this) {
            relations = null;
        }
    }

    /** {@inheritDoc} */
    @Override
    public void prepareCreate() {}

    /** {@inheritDoc} */
    @Override
    public void created(DbConnection con) throws Exception {

        if (!field.getConfig().managed() || !isChanged()) return;

        String src = field.getConfig().sourceAttribute();
        if ("".equals(src)) src = "Id";
        src = src.toLowerCase();
        Field idField = field.getTable().getField(src);
        if (idField == null) return;
        Object id = idField.getFromTarget(obj);
        if (id == null) return;

        String tar = field.getConfig().targetAttribute();
        if ("".equals(tar)) tar = field.getName() + "Id";
        tar = tar.toLowerCase();

        relations.save(field.getManager(), con, tar, id);
    }

    /** {@inheritDoc} */
    @Override
    public void saved(DbConnection con) throws Exception {
        created(con);
    }

    /** {@inheritDoc} */
    @Override
    public void setManager(FieldRelation field, Object obj) {
        this.field = field;
        this.obj = obj;
    }

    /** {@inheritDoc} */
    @Override
    public boolean isChanged() {
        return relations != null && relations.changed();
    }

    /** {@inheritDoc} */
    @Override
    public void loaded(DbConnection con) {
        synchronized (this) {
            relations = null;
        }
    }

    /** {@inheritDoc} */
    @Override
    public void prepareSave(DbConnection con) {
        // TODO Auto-generated method stub

    }
}