ConfigurationTranslator.java

/*
 * The MIT License (MIT)
 * 
 * Copyright (c) 2015 socraticphoenix@gmail.com
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software and
 * associated documentation files (the "Software"), to deal in the Software without restriction,
 * including without limitation the rights to use, copy, modify, merge, publish, distribute,
 * sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in all copies or
 * substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT
 * NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 * @author Socratic_Phoenix (socraticphoenix@gmail.com)
 */

import com.google.common.reflect.TypeToken;
import ninja.leaping.configurate.ConfigurationNode;
import ninja.leaping.configurate.hocon.HoconConfigurationLoader;
import ninja.leaping.configurate.objectmapping.ObjectMappingException;
import org.spongepowered.api.item.inventory.ItemStack;
import org.spongepowered.api.util.CollectionUtils;
import org.spongepowered.api.util.ResettableBuilder;

import java.util.HashMap;
import java.util.Map;

public class ConfigurationTranslator<T> {
    private static HoconConfigurationLoader generator;

    static {
        generator = HoconConfigurationLoader.builder().build();
    }

    private Map<String, String> keyTranslations; //Original -> new key | mappings
    private Class<T> target;
    private int content;

    public ConfigurationTranslator(Map<String, String> keyTranslations, Class<T> target, int content) {
        this.keyTranslations = keyTranslations;
        this.target = target;
        this.content = content;
    }

    public static <V> Builder<V> builder(Class<V> target, int content) {
        return new Builder<>(target, content);
    }

    public static ConfigurationTranslator<ItemStack> itemStackTranslator() {
        return ConfigurationTranslator.builder(ItemStack.class, 1)
                .transfer("UnsafeData", "tag")
                .transfer("ItemType", "id")
                .transfer("UnsafeDamage", "damage")
                .transfer("Count", "count")
                .build();
    }

    public ConfigurationNode convertObject(T in) throws ObjectMappingException {
        ConfigurationNode node = ConfigurationTranslator.generator.createEmptyNode();
        node.setValue(TypeToken.of(this.target), in);
        ConfigurationNode out = ConfigurationTranslator.generator.createEmptyNode();
        this.keyTranslations.entrySet().forEach(e -> out.getNode(e.getValue()).setValue(node.getNode(e.getKey())));
        return out;
    }

    public T convertNode(ConfigurationNode in) throws ObjectMappingException {
        ConfigurationNode out = ConfigurationTranslator.generator.createEmptyNode();
        this.keyTranslations.entrySet().forEach(e -> out.getNode(e.getKey()).setValue(in.getNode(e.getValue())));
        out.getNode("ContentVersion").setValue(this.content);
        return out.getValue(TypeToken.of(this.target));
    }

    public static class Builder<U> implements ResettableBuilder<ConfigurationTranslator<U>, Builder<U>> {
        private Map<String, String> keyTranslations;
        private Class<U> target;
        private int content;

        public Builder(Class<U> target, int content) {
            this.target = target;
            this.keyTranslations = new HashMap<>();
            this.content = content;
        }

        public Builder transfer(String originalKey, String newKey) {
            this.keyTranslations.put(originalKey, newKey);
            return this;
        }

        public ConfigurationTranslator<U> build() {
            //copy the map so that the build can potentially continue being used after this build
            return new ConfigurationTranslator<>(CollectionUtils.copyMap(this.keyTranslations), this.target, this.content);
        }

        @Override
        public Builder<U> from(ConfigurationTranslator<U> value) {
            if (value.target.equals(this.target)) {
                this.keyTranslations = value.keyTranslations;
                return this;
            } else {
                throw new IllegalArgumentException("Builder and value do not have compatible target classes.");
            }
        }

        @Override
        public Builder<U> reset() {
            this.keyTranslations.clear();
            return this;
        }
    }

}