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//                                                                       //
//               The Next Generation Logic Library                       //
//                                                                       //
///////////////////////////////////////////////////////////////////////////
//                                                                       //
//  Copyright 2015-20xx Christoph Zengler                                //
//                                                                       //
//  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                              //
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//  http://www.apache.org/licenses/LICENSE-2.0                           //
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//  Unless required by applicable law or agreed to in writing, software  //
//  distributed under the License is distributed on an "AS IS" BASIS,    //
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//  permissions and limitations under the License.                       //
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///////////////////////////////////////////////////////////////////////////

package org.logicng.handlers;

/**
 * A BDD handler which cancels the build process after a given number of added nodes.
 * @version 1.6.2
 * @since 1.6.2
 */
public class NumberOfNodesBDDHandler extends ComputationHandler implements BDDHandler {

    private final int bound;
    private int count;

    /**
     * Constructs a new BDD handler with an upper bound for the number of added nodes (inclusive).
     * @param bound the upper bound
     */
    public NumberOfNodesBDDHandler(final int bound) {
        if (bound < 0) {
            throw new IllegalArgumentException("The bound for added nodes must be equal or greater than 0.");
        }
        this.bound = bound;
    }

    @Override
    public void started() {
        super.started();
        this.count = 0;
    }

    @Override
    public boolean newRefAdded() {
        this.aborted = ++this.count >= this.bound;
        return !this.aborted;
    }
}