/*
 * The MIT License
 *
 * Copyright (c) 2009 The Broad Institute
 *
 * 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.
 */
package htsjdk.samtools;

import java.io.Serializable;

/**
 * One component of a cigar string.  The component comprises the operator, and the number of bases to which
 * the  operator applies.
 */
public class CigarElement implements Serializable {
    public static final long serialVersionUID = 1L;

    private final int length;
    private final CigarOperator operator;

    public CigarElement(final int length, final CigarOperator operator) {
        if (length < 0)
            throw new IllegalArgumentException(String.format(
                    "Cigar element being constructed with negative length: %d and operation: %s",
                    length, operator.name()));
        this.length = length;
        this.operator = operator;
    }

    public int getLength() {
        return length;
    }

    public CigarOperator getOperator() {
        return operator;
    }

    @Override
    public boolean equals(final Object o) {
        if (this == o) return true;
        if (!(o instanceof CigarElement)) return false;

        final CigarElement that = (CigarElement) o;

        if (length != that.length) return false;
        if (operator != that.operator) return false;

        return true;
    }

    @Override
    public int hashCode() {
        int result = length;
        result = 31 * result + (operator != null ? operator.hashCode() : 0);
        return result;
    }

    @Override
    public String toString() {
        return String.valueOf(this.length) + this.operator;
    }
}
