io.trino.json.JsonPathEvaluator Maven / Gradle / Ivy

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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.json;

import com.fasterxml.jackson.databind.JsonNode;
import io.trino.json.ir.IrJsonPath;
import io.trino.metadata.FunctionManager;
import io.trino.metadata.Metadata;
import io.trino.metadata.ResolvedFunction;
import io.trino.spi.connector.ConnectorSession;
import io.trino.spi.type.TypeManager;
import io.trino.sql.InterpretedFunctionInvoker;

import java.util.List;

import static java.util.Objects.requireNonNull;

/**
 * Evaluates the JSON path expression using given JSON input and parameters,
 * respecting the path mode `strict` or `lax`.
 * Successful evaluation results in a sequence of objects.
 * Each object in the sequence is either a `JsonNode` or a `TypedValue`
 * Certain error conditions might be suppressed in `lax` mode.
 * Any unsuppressed error condition causes evaluation failure.
 * In such case, `PathEvaluationError` is thrown.
 */
public class JsonPathEvaluator
{
    private final IrJsonPath path;
    private final Invoker invoker;
    private final CachingResolver resolver;

    public JsonPathEvaluator(IrJsonPath path, ConnectorSession session, Metadata metadata, TypeManager typeManager, FunctionManager functionManager)
    {
        requireNonNull(path, "path is null");
        requireNonNull(session, "session is null");
        requireNonNull(metadata, "metadata is null");
        requireNonNull(typeManager, "typeManager is null");
        requireNonNull(functionManager, "functionManager is null");

        this.path = path;
        this.invoker = new Invoker(session, functionManager);
        this.resolver = new CachingResolver(metadata);
    }

    public List