io.datatree.dom.builtin.AbstractAdapter Maven / Gradle / Ivy

Go to download
/**
 * This software is licensed under the Apache 2 license, quoted below.

 * 

 * Copyright 2017 Andras Berkes [[email protected]]

 * 

 * 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 io.datatree.dom.builtin;

import java.util.Map;
import java.util.function.Consumer;

import io.datatree.dom.Config;
import io.datatree.dom.TreeReader;
import io.datatree.dom.TreeWriter;
import io.datatree.dom.WriterFunction;

/**
 * Reader / writer class.
 * 
 * @author Andras Berkes [[email protected]]
 */
public abstract class AbstractAdapter implements TreeReader, TreeWriter {

	@SafeVarargs
	@SuppressWarnings({ "unchecked" })
	protected static final  boolean tryToAddSerializers(String consumerClass, T... factories) {
		boolean allInstalled = true;
		for (T factory : factories) {
			try {
				((Consumer) Class.forName(consumerClass).newInstance()).accept(factory);
			} catch (Throwable ignored) {

				// Classes aren't available
				allInstalled = false;
			}
		}
		return allInstalled;
	}
	
	protected static final byte[] toBinary(Object value, Object meta, boolean insertMeta, WriterFunction implementation) {
		if (value == null) {
			return new byte[0];
		}
		Map map = insertMeta(value, meta, insertMeta);
		try {
			return implementation.apply(value);
		} catch (Exception cause) {
			throw new IllegalArgumentException("Unable to deserialize object!", cause);
		} finally {
			removeMeta(map);
		}
	}
	
	protected static final String toString(Object value, Object meta, boolean insertMeta, WriterFunction implementation) {
		if (value == null) {
			return "";
		}
		Map map = insertMeta(value, meta, insertMeta);
		try {
			return implementation.apply(value);
		} catch (Exception cause) {
			cause.printStackTrace();
			throw new IllegalArgumentException("Unable to deserialize object!", cause);
		} finally {
			removeMeta(map);
		}
	}
	
	@SuppressWarnings("unchecked")
	protected static final Map insertMeta(Object value, Object meta, boolean insertMeta) {
		if (!insertMeta || value == null || meta == null) {
			return null;
		}
		if (!(value instanceof Map)) {
			return null;
		}
		Map map = (Map) value;
		map.put(Config.META, meta);
		return map;
	}

	protected static final void removeMeta(Map map) {
		if (map != null) {
			map.remove(Config.META);
		}
	}
	
}