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/*
 * Copyright (C) 2014 The droitated DB Authors
 *
 * 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 org.droitateddb;

import org.droitateddb.schema.AbstractAttribute;
import org.droitateddb.schema.SchemaConstants;

import java.lang.reflect.Field;

/**
 * Provides utility methods for droitated DB.
 *
 * @author Falk Appel
 * @author Alexander Frank
 */
public class Utilities {
    public static RuntimeException handle(Exception e) {
        if (e instanceof RuntimeException) {
            throw (RuntimeException) e;
        } else {
            throw new RuntimeException(e);
        }
    }

    static void setFieldValue(Field field, final Object data, Object value) {
        try {
            field.setAccessible(true);
            field.set(data, value);
        } catch (IllegalAccessException e) {
            throw handle(e);
        }
    }

    static Object getFieldValue(final Object data, Field field) {
        try {
            field.setAccessible(true);
            return field.get(data);
        } catch (IllegalAccessException e) {
            throw handle(e);
        }
    }

    static String getLinkTableName(Class linkTableSchema) {
        try {
            return (String) linkTableSchema.getDeclaredField(SchemaConstants.TABLE_NAME).get(null);
        } catch (Exception e) {
            throw handle(e);
        }
    }

    static AbstractAttribute[] getLinkTableColumns(Class linkTableSchema) {
        try {
            return (AbstractAttribute[]) linkTableSchema.getDeclaredField(SchemaConstants.ATTRIBUTES).get(null);
        } catch (Exception e) {
            throw handle(e);
        }
    }

    static String[] getLinkTableProjection(Class linkTableSchema) {
        try {
            return (String[]) linkTableSchema.getDeclaredField(SchemaConstants.PROJECTION).get(null);
        } catch (Exception e) {
            throw handle(e);
        }
    }

    static Number getPrimaryKey(final Object data, EntityData entityData) {
        return (Number) getFieldValue(data, entityData.primaryKey);
    }
}