Arakne / SwfLangLoader

 * This file is part of ArakneLangLoader.

 *

 * ArakneLangLoader 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.

 *

 * ArakneLangLoader 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 ArakneLangLoader.  If not, see <https://www.gnu.org/licenses/>.

 *

 * Copyright (c) 2020 Vincent Quatrevieux

 */

package fr.arakne.swflangloader.parser.mapper;

import fr.arakne.swflangloader.parser.Assignation;

import fr.arakne.swflangloader.parser.AssignationParser;

import java.lang.reflect.Field;

import java.lang.reflect.ParameterizedType;

import java.util.HashMap;

import java.util.Map;

/**

 * Hydrator for an SWF structure using mapped properties

 *

 * @param <T> The target structure type

 */

final public class MapperHydrator<T> {

    final private AssignationParser parser = new AssignationParser();

    final private Map<String, PropertyHydrator<T, ?>> hydrators = new HashMap<>();

    private PropertyHydrator<T, Map<String, Object>> defaultHydrator;

    /**

     * Define the default property (i.e. for undeclared variable) hydrator

     */

    public void setDefaultHydrator(PropertyHydrator<T, Map<String, Object>> defaultHydrator) {

        this.defaultHydrator = defaultHydrator;

    }

    /**

     * Define a property for a simple variable

     *

     * @param varName The SWF variable name

     * @param type The variable type

     * @param hydrator Hydrator to use

     *

     * @param <V> The variable type

     */

    public <V> void declareSimpleProperty(String varName, Class<V> type, PropertyHydrator<T, V> hydrator) {

        parser.declareSimple(varName, type);

        hydrators.put(varName, hydrator);

    }

    /**

     * Define a property for a map variable

     *

     * @param varName The SWF variable name

     * @param keyType The map key type

     * @param type The map value type

     * @param hydrator Hydrator to use

     *

     * @param <V> The variable type

     */

    public <K, V> void declareMapProperty(String varName, Class<K> keyType, Class<V> type, PropertyHydrator<T, Map<K, V>> hydrator) {

        parser.declareMap(varName, keyType, type);

        hydrators.put(varName, hydrator);

    }

    /**

     * Hydrator the target structure using the given action script line

     *

     * @param target The structure to hydrate

     * @param line The action script line

     */

    public void hydrate(T target, String line) {

        Assignation assignation = parser.parseLine(line);

        if (assignation.isNull()) {

            return;

        }

        if (!hydrators.containsKey(assignation.variableName())) {

            hydrateUndeclared(target, assignation);

            return;

        }

        @SuppressWarnings("unchecked")

        PropertyHydrator<T, Object> hydrator = (PropertyHydrator<T, Object>) hydrators.get(assignation.variableName());

        if (!assignation.isAssociative()) {

            hydrator.set(target, assignation.value());

            return;

        }

        @SuppressWarnings("unchecked")

        Map<Object, Object> value = (Map<Object, Object>) hydrator.get(target);

        if (value == null) {

            value = new HashMap<>();

            hydrator.set(target, value);

        }

        value.put(assignation.key(), assignation.value());

    }

    @SuppressWarnings("unchecked")

    private void hydrateUndeclared(T target, Assignation assignation) {

        if (defaultHydrator == null) {

            return;

        }

        Map<String, Object> value = defaultHydrator.get(target);

        if (value == null) {

            value = new HashMap<>();

            defaultHydrator.set(target, value);

        }

        if (!assignation.isAssociative()) {

            value.put(assignation.variableName(), assignation.value());

            return;

        }

        final Object lastValue = value.get(assignation.variableName());

        Map<Object, Object> mapValue;

        if (!(lastValue instanceof Map)) {

            mapValue = new HashMap<>();

            value.put(assignation.variableName(), mapValue);

        } else {

            mapValue = (Map<Object, Object>) lastValue;

        }

        mapValue.put(assignation.key(), assignation.value());

    }

    /**

     * Create the hydrator instance by parsing annotations

     *

     * @param type The structure class

     * @param <T> The structure type

     *

     * @return The hydrator instance

     */

    static public <T> MapperHydrator<T> parseAnnotations(Class<T> type) {

        MapperHydrator<T> hydrator = new MapperHydrator<>();

        Class<?> current = type;

        while (current.getSuperclass() != null) {

            for (Field field : current.getDeclaredFields()) {

                if (field.isAnnotationPresent(SwfDefault.class)) {

                    defineDefaultField(hydrator, field);

                    continue;

                }

                SwfVariable annotation = field.getAnnotation(SwfVariable.class);

                if (annotation != null) {

                    defineSwfField(hydrator, field, annotation);

                }

            }

            current = current.getSuperclass();

        }

        return hydrator;

    }

    }

    private static <T> void defineDefaultField(MapperHydrator<T> hydrator, Field field) {

        if (!field.getType().equals(Map.class)) {

            throw new IllegalArgumentException("Default swf field must be declared as Map<String, Object>");

        }

        hydrator.setDefaultHydrator(new ReflectionPropertyHydrator<>(field));

    }

}