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SQL bindings for the FROST-Server.

There is a newer version: 2.5.0

/*
 * Copyright (C) 2019 Fraunhofer IOSB.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 3 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library. If not, see .
 */
package de.fraunhofer.iosb.ilt.frostserver.persistence.pgjooq.fieldwrapper;

import org.jooq.Condition;
import org.jooq.Field;

/**
 *
 * @author Hylke van der Schaaf
 */
public interface FieldWrapper {

    /**
     * Check if the field is a Condition.
     *
     * @return true if the Field is a Condition.
     */
    public default boolean isCondition() {
        return false;
    }

    /**
     * Get the Condition wrapped, or null if the wrapped item is not a
     * condition.
     *
     * @return the Condition wrapped, or null if the wrapped item is not a
     * condition.
     */
    public default Condition getCondition() {
        return null;
    }

    /**
     * Get the default Field contained in this wrapper. A wrapper may wrap
     * multiple fields with different types.
     *
     * @return the default Field of this wrapper.
     */
    public Field getDefaultField();

    public static Field fieldFromObject(Object in) {
        if (in instanceof Field) {
            return (Field) in;
        }
        if (in instanceof FieldWrapper) {
            FieldWrapper fieldWrapper = (FieldWrapper) in;
            return fieldWrapper.getDefaultField();
        }
        throw new IllegalArgumentException("Object is not a Field or FieldWrapper: " + in.getClass());
    }

    /**
     * Return a field of the requested type, optionally casting if possible, or
     * null if not.
     *
     * @param  the Type of the Field to return.
     * @param expectedClazz The class implementing the type of the Field to
     * return.
     * @param canCast Flag indicating casting is allowed.
     * @return A field of the requested type, or null.
     */
    public  Field getFieldAsType(Class expectedClazz, boolean canCast);

}