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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.spi.security;

import java.util.Optional;

import static java.util.Objects.requireNonNull;

public class ViewExpression
{
    private final Optional identity;
    private final Optional catalog;
    private final Optional schema;
    private final String expression;

    @Deprecated
    public ViewExpression(String identity, Optional catalog, Optional schema, String expression)
    {
        this(Optional.of(identity), catalog, schema, expression);
    }

    public ViewExpression(Optional identity, Optional catalog, Optional schema, String expression)
    {
        this.identity = requireNonNull(identity, "identity is null");
        this.catalog = requireNonNull(catalog, "catalog is null");
        this.schema = requireNonNull(schema, "schema is null");
        this.expression = requireNonNull(expression, "expression is null");

        if (catalog.isEmpty() && schema.isPresent()) {
            throw new IllegalArgumentException("catalog must be present if schema is present");
        }
    }

    @Deprecated
    public String getIdentity()
    {
        return identity.orElseThrow();
    }

    /**
     * @return user as whom the view expression will be evaluated. If empty identity is returned
     * then session user is used.
     */
    public Optional getSecurityIdentity()
    {
        return identity;
    }

    public Optional getCatalog()
    {
        return catalog;
    }

    public Optional getSchema()
    {
        return schema;
    }

    public String getExpression()
    {
        return expression;
    }
}