PartTreeReactiveCosmosQuery.java

// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT License.
package com.azure.spring.data.cosmos.repository.query;

import com.azure.spring.data.cosmos.core.ReactiveCosmosOperations;
import com.azure.spring.data.cosmos.core.mapping.CosmosPersistentProperty;
import com.azure.spring.data.cosmos.core.query.CosmosQuery;
import org.springframework.data.mapping.context.MappingContext;
import org.springframework.data.repository.query.ResultProcessor;
import org.springframework.data.repository.query.parser.Part;
import org.springframework.data.repository.query.parser.PartTree;

/**
 * Reactive cosmos query class with {@link PartTree} to parse a {@link String} into a tree or {@link PartTree.OrPart}s
 * consisting of simple {@link Part} instances in turn.
 */
public class PartTreeReactiveCosmosQuery extends AbstractReactiveCosmosQuery {

    private final PartTree tree;
    private final MappingContext<?, CosmosPersistentProperty> mappingContext;
    private final ResultProcessor processor;

    /**
     * Initialization
     * @param method ReactiveCosmosQueryMethod
     * @param operations ReactiveCosmosOperations
     */
    public PartTreeReactiveCosmosQuery(ReactiveCosmosQueryMethod method, ReactiveCosmosOperations operations) {
        super(method, operations);

        this.processor = method.getResultProcessor();
        this.tree = new PartTree(method.getName(), processor.getReturnedType().getDomainType());
        this.mappingContext = operations.getConverter().getMappingContext();
    }

    @Override
    protected CosmosQuery createQuery(ReactiveCosmosParameterAccessor accessor) {
        final ReactiveCosmosQueryCreator creator = new ReactiveCosmosQueryCreator(tree, accessor, mappingContext);

        final CosmosQuery query = creator.createQuery();

        if (tree.isLimiting()) {
            throw new UnsupportedOperationException("Limiting is not supported.");
        }

        return query;
    }

    @Override
    protected boolean isDeleteQuery() {
        return tree.isDelete();
    }

    @Override
    protected boolean isExistsQuery() {
        return tree.isExistsProjection();
    }
}