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/*
 * SPDX-License-Identifier: Apache-2.0
 *
 * The OpenSearch Contributors require contributions made to
 * this file be licensed under the Apache-2.0 license or a
 * compatible open source license.
 */

/*
 * Licensed to Elasticsearch under one or more contributor
 * license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright
 * ownership. Elasticsearch licenses this file to you 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.
 */
/*
 * Modifications Copyright OpenSearch Contributors. See
 * GitHub history for details.
 */

package org.opensearch.search.lookup;

import org.opensearch.index.mapper.MappedFieldType;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;

/**
 * Look up a field
 *
 * @opensearch.internal
 */
public class FieldLookup {

    // we can cached fieldType completely per name, since its on an index/shard level (the lookup, and it does not change within the scope
    // of a search request)
    private final MappedFieldType fieldType;

    private Map> fields;

    private Object value;

    private boolean valueLoaded = false;

    private List values = new ArrayList<>();

    private boolean valuesLoaded = false;

    FieldLookup(MappedFieldType fieldType) {
        this.fieldType = fieldType;
    }

    public MappedFieldType fieldType() {
        return fieldType;
    }

    public Map> fields() {
        return fields;
    }

    /**
     * Sets the post processed values.
     */
    public void fields(Map> fields) {
        this.fields = fields;
    }

    public void clear() {
        value = null;
        valueLoaded = false;
        values.clear();
        valuesLoaded = false;
        fields = null;
    }

    public boolean isEmpty() {
        if (valueLoaded) {
            return value == null;
        }
        if (valuesLoaded) {
            return values.isEmpty();
        }
        return getValue() == null;
    }

    public Object getValue() {
        if (valueLoaded) {
            return value;
        }
        valueLoaded = true;
        value = null;
        List values = fields.get(fieldType.name());
        return values != null ? value = values.get(0) : null;
    }

    public List getValues() {
        if (valuesLoaded) {
            return values;
        }
        valuesLoaded = true;
        values.clear();
        return values = fields().get(fieldType.name());
    }
}
    

    

    

            

    

            



    
    






    
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