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SQL Parser and Optimizer
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/*
 * Copyright 2024 Hazelcast Inc.
 *
 * Licensed under the Hazelcast Community License (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://hazelcast.com/hazelcast-community-license
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.hazelcast.sql.impl.schema;

import com.hazelcast.internal.cluster.Versions;
import com.hazelcast.jet.sql.impl.parse.SqlCreateMapping;
import com.hazelcast.nio.ObjectDataInput;
import com.hazelcast.nio.ObjectDataOutput;
import com.hazelcast.nio.serialization.impl.Versioned;
import com.hazelcast.sql.impl.SqlDataSerializerHook;

import javax.annotation.Nonnull;
import java.io.IOException;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.Objects;

/**
 * A simplified, calcite-independent representation of {@link
 * com.hazelcast.jet.sql.impl.parse.SqlCreateMapping}. It's stored in
 * the internal storage for mappings, and also used internally to
 * represent a mapping.
 */
public class Mapping implements SqlCatalogObject, Versioned {

    private String name;
    private String[] externalName;
    private String dataConnection;
    private String connectorType;
    private String objectType;
    private List mappingFields;
    private Map options;

    public Mapping() {
    }

    public Mapping(
            String name,
            String externalName,
            String dataConnection,
            String connectorType,
            String objectType,
            List fields,
            Map options
    ) {
        this(name, new String[]{externalName}, dataConnection, connectorType, objectType, fields, options);
    }

    public Mapping(
            String name,
            String[] externalName,
            String dataConnection,
            String connectorType,
            String objectType,
            List fields,
            Map options
    ) {
        assert connectorType == null || dataConnection == null;
        this.name = name;
        this.externalName = externalName;
        this.dataConnection = dataConnection;
        this.connectorType = connectorType;
        this.objectType = objectType;
        this.mappingFields = fields;
        this.options = options;
    }

    @Override
    public String name() {
        return name;
    }

    public String[] externalName() {
        return externalName;
    }

    public String connectorType() {
        return connectorType;
    }

    public String dataConnection() {
        return dataConnection;
    }

    public String objectType() {
        return objectType;
    }

    public List fields() {
        return Collections.unmodifiableList(mappingFields);
    }

    public Map options() {
        return Collections.unmodifiableMap(options);
    }

    @Override
    public int getClassId() {
        return SqlDataSerializerHook.MAPPING;
    }

    @Override
    public void writeData(ObjectDataOutput out) throws IOException {
        out.writeString(name);
        if (out.getVersion().isGreaterOrEqual(Versions.V5_3)) {
            out.writeStringArray(externalName);
        } else {
            out.writeString(externalName[0]);
        }
        out.writeString(connectorType);
        if (out.getVersion().isGreaterOrEqual(Versions.V5_3)) {
            out.writeString(dataConnection);
            out.writeString(objectType);
        }
        out.writeObject(mappingFields);
        out.writeObject(options);
    }

    @Override
    public void readData(ObjectDataInput in) throws IOException {
        name = in.readString();
        if (in.getVersion().isGreaterOrEqual(Versions.V5_3)) {
            externalName = in.readStringArray();
        } else {
            externalName = new String[]{in.readString()};
        }
        connectorType = in.readString();
        if (in.getVersion().isGreaterOrEqual(Versions.V5_3)) {
            dataConnection = in.readString();
            objectType = in.readString();
        }
        mappingFields = in.readObject();
        options = in.readObject();
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {
            return false;
        }
        Mapping mapping = (Mapping) o;
        return Objects.equals(name, mapping.name)
                && Arrays.equals(externalName, mapping.externalName)
                && Objects.equals(dataConnection, mapping.dataConnection)
                && Objects.equals(connectorType, mapping.connectorType)
                && Objects.equals(objectType, mapping.objectType)
                && Objects.equals(mappingFields, mapping.mappingFields)
                && Objects.equals(options, mapping.options);
    }

    @Override
    public int hashCode() {
        return Objects.hash(name, externalName, dataConnection, connectorType, objectType, mappingFields, options);
    }

    @Override
    @Nonnull
    public String unparse() {
        return SqlCreateMapping.unparse(this);
    }
}