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/*******************************************************************************
 * Copyright (c) 2015-2018 Skymind, Inc.
 *
 * 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.
 *
 * 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.common.util.ArrayUtil;

/**
 * Mini dsl for building conditions
 *
 * @author Adam Gibson
 */
public class ConditionBuilder {

    private Condition soFar;


    public ConditionBuilder or(Condition... conditions) {
        if (soFar == null)
            soFar = new Or(conditions);
        else {
            soFar = new Or(ArrayUtil.combine(conditions, new Condition[] {soFar}));
        }
        return this;
    }

    public ConditionBuilder and(Condition... conditions) {
        if (soFar == null)
            soFar = new And(conditions);
        else {
            soFar = new And(ArrayUtil.combine(conditions, new Condition[] {soFar}));
        }
        return this;
    }

    public ConditionBuilder eq(Condition... conditions) {
        if (soFar == null)
            soFar = new ConditionEquals(conditions);
        else {
            soFar = new ConditionEquals(ArrayUtil.combine(conditions, new Condition[] {soFar}));
        }
        return this;
    }

    public ConditionBuilder not() {
        if (soFar == null)
            throw new IllegalStateException("No condition to take the opposite of");
        soFar = new Not(soFar);
        return this;
    }

    public Condition build() {
        return soFar;
    }


}