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(De-)Serializers for the Simple Automaton Format

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/* Copyright (C) 2015 TU Dortmund
 * This file is part of AutomataLib, http://www.automatalib.net/.
 * 
 * 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 net.automatalib.serialization.saf;

import java.io.DataInput;
import java.io.IOException;

final class AcceptanceDecoder implements BlockPropertyDecoder {

	private int currAcc;
	private int mask;
	
	@Override
	public void start(DataInput in) throws IOException {
		currAcc = in.readInt();
		mask = 1;
	}
	@Override
	public Boolean readProperty(DataInput in) throws IOException {
		if (mask == 0) {
			start(in);
		}
		Boolean prop = Boolean.valueOf((currAcc & mask) == mask);
		mask <<= 1;
		return prop;
	}
}