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/*
 * Copyright (c) CQSE GmbH
 *
 * 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.conqat.engine.commons.util;

import java.io.IOException;

import org.conqat.lib.commons.collections.CompactLines;

import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonToken;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonDeserializer;
import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.SerializerProvider;
import com.fasterxml.jackson.databind.module.SimpleModule;

/**
 * Jackson module which supports serialization and deserialization of {@link CompactLines} objects
 * to lists of numbers.
 */
public class CompactLinesSerializationModule extends SimpleModule {

	CompactLinesSerializationModule() {
		addSerializer(CompactLines.class, new CompactLinesSerializer());
		addDeserializer(CompactLines.class, new CompactLinesDeserializer());
	}

	private static class CompactLinesSerializer extends JsonSerializer {

		@Override
		public void serialize(CompactLines value, JsonGenerator gen, SerializerProvider serializers)
				throws IOException {
			gen.writeStartArray();
			for (Integer line : value) {
				gen.writeNumber(line);
			}
			gen.writeEndArray();
		}
	}

	private static class CompactLinesDeserializer extends JsonDeserializer {

		@Override
		public CompactLines deserialize(JsonParser p, DeserializationContext ctxt) throws IOException {
			if (!p.isExpectedStartArrayToken()) {
				throw new JsonParseException(p, "Expected start of array");
			}
			CompactLines lines = new CompactLines();
			while (p.nextToken() != JsonToken.END_ARRAY) {
				lines.add(p.getIntValue());
			}
			return lines;
		}
	}
}