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 * 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
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package org.elasticsearch.search.internal;

import org.elasticsearch.common.io.stream.BytesStreamOutput;
import org.elasticsearch.index.query.QueryBuilder;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.index.query.TermQueryBuilder;
import org.elasticsearch.test.ESTestCase;
import org.elasticsearch.test.EqualsHashCodeTestUtils;

import java.util.Arrays;

import static org.hamcrest.Matchers.greaterThan;
import static org.hamcrest.Matchers.instanceOf;

public class AliasFilterTests extends ESTestCase {

    public void testEqualsAndHashCode() {
        final QueryBuilder filter = QueryBuilders.termQuery("field", "value");
        final String[] aliases = new String[] { "alias_0", "alias_1" };
        final AliasFilter aliasFilter = new AliasFilter(filter, aliases);
        final EqualsHashCodeTestUtils.CopyFunction<AliasFilter> aliasFilterCopyFunction = x -> {
            assertThat(x.getQueryBuilder(), instanceOf(TermQueryBuilder.class));
            final BytesStreamOutput out = new BytesStreamOutput();
            x.getQueryBuilder().writeTo(out);
            final QueryBuilder otherFilter = new TermQueryBuilder(out.bytes().streamInput());
            final String[] otherAliases = Arrays.copyOf(x.getAliases(), x.getAliases().length);
            return new AliasFilter(otherFilter, otherAliases);
        };

        final EqualsHashCodeTestUtils.MutateFunction<AliasFilter> aliasFilterMutationFunction = x -> {
            assertThat(x.getQueryBuilder(), instanceOf(TermQueryBuilder.class));
            final BytesStreamOutput out = new BytesStreamOutput();
            x.getQueryBuilder().writeTo(out);
            final QueryBuilder otherFilter = new TermQueryBuilder(out.bytes().streamInput());
            assertThat(x.getAliases().length, greaterThan(0));
            final String[] otherAliases = Arrays.copyOf(x.getAliases(), x.getAliases().length - 1);
            return new AliasFilter(otherFilter, otherAliases);
        };

        EqualsHashCodeTestUtils.checkEqualsAndHashCode(aliasFilter, aliasFilterCopyFunction, aliasFilterMutationFunction);
    }

}