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Trino - Prometheus connector
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/*
 * 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 io.trino.plugin.prometheus;

import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonProperty;
import io.trino.spi.connector.ColumnHandle;
import io.trino.spi.connector.ConnectorTableHandle;
import io.trino.spi.connector.SchemaTableName;
import io.trino.spi.predicate.TupleDomain;

import java.util.Objects;
import java.util.Optional;

import static java.util.Objects.requireNonNull;

public final class PrometheusTableHandle
        implements ConnectorTableHandle
{
    private final String schemaName;
    private final String tableName;
    private final Optional> predicate;

    @JsonCreator
    public PrometheusTableHandle(
            @JsonProperty("schemaName") String schemaName,
            @JsonProperty("tableName") String tableName)
    {
        this(schemaName, tableName, Optional.empty());
    }

    private PrometheusTableHandle(String schemaName, String tableName, Optional> predicate)
    {
        this.schemaName = requireNonNull(schemaName, "schemaName is null");
        this.tableName = requireNonNull(tableName, "tableName is null");
        this.predicate = requireNonNull(predicate, "predicate is null");
    }

    @JsonProperty
    public String getSchemaName()
    {
        return schemaName;
    }

    @JsonProperty
    public String getTableName()
    {
        return tableName;
    }

    public Optional> getPredicate()
    {
        return this.predicate;
    }

    public SchemaTableName toSchemaTableName()
    {
        return new SchemaTableName(schemaName, tableName);
    }

    public PrometheusTableHandle withPredicate(TupleDomain predicate)
    {
        return new PrometheusTableHandle(schemaName, tableName, Optional.of(predicate));
    }

    @Override
    public int hashCode()
    {
        return Objects.hash(schemaName, tableName);
    }

    @Override
    public boolean equals(Object obj)
    {
        if (this == obj) {
            return true;
        }
        if ((obj == null) || (getClass() != obj.getClass())) {
            return false;
        }

        PrometheusTableHandle other = (PrometheusTableHandle) obj;
        return Objects.equals(this.schemaName, other.schemaName) &&
                Objects.equals(this.tableName, other.tableName);
    }

    @Override
    public String toString()
    {
        return schemaName + ":" + tableName;
    }
}