/*
 * Copyright 2018 Crown Copyright
 *
 * 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 stroom.dashboard.expression.v1;

import stroom.dashboard.expression.v1.ref.StoredValues;

import java.util.function.Supplier;

final class ExtractionGenerator extends AbstractSingleChildGenerator {

    private final Extractor extractor;

    ExtractionGenerator(final Generator childGenerator, final Extractor extractor) {
        super(childGenerator);
        this.extractor = extractor;
    }

    @Override
    public void set(final Val[] values, final StoredValues storedValues) {
        childGenerator.set(values, storedValues);
    }

    @Override
    public Val eval(final StoredValues storedValues, final Supplier<ChildData> childDataSupplier) {
        final Val val = childGenerator.eval(storedValues, childDataSupplier);
        if (!val.type().isValue()) {
            return val;
        }
        return ValString.create(extractor.extract(val.toString()));
    }
}
