/*
 *  ******************************************************************************
 *  *
 *  *
 *  * This program and the accompanying materials are made available under the
 *  * terms of the Apache License, Version 2.0 which is available at
 *  * https://www.apache.org/licenses/LICENSE-2.0.
 *  *
 *  *  See the NOTICE file distributed with this work for additional
 *  *  information regarding copyright ownership.
 *  * 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.
 *  *
 *  * SPDX-License-Identifier: Apache-2.0
 *  *****************************************************************************
 */

package org.nd4j.linalg.indexing.conditions;

import org.nd4j.linalg.factory.Nd4j;

public class EpsilonEquals extends BaseCondition {
    private double eps = Nd4j.EPS_THRESHOLD;
    /**
     * Special constructor for pairwise boolean operations.
     */
    public EpsilonEquals() {
        this(0.0);
    }

    public EpsilonEquals(Number value) {
        this(value, Nd4j.EPS_THRESHOLD);
    }

    public EpsilonEquals(Number value, Number eps) {
        super(value);
        this.eps = eps.doubleValue();
    }

    @Override
    public void setValue(Number value) {
        //no op where we can pass values in
    }


    @Override
    public double epsThreshold() {
        return this.eps;
    }

    /**
     * Returns condition ID for native side
     *
     * @return
     */
    @Override
    public Conditions.ConditionMode conditionType() {
        return Conditions.ConditionMode.EPSILON_EQUALS;
    }

    @Override
    public Boolean apply(Number input) {
        return Math.abs(input.floatValue() - value.floatValue()) < Nd4j.EPS_THRESHOLD;
    }
}
