com.querydsl.mongodb.document.MongodbDocumentSerializer Maven / Gradle / Ivy

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/*
 * Copyright 2020 the original author or authors.
 *
 * 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 com.querydsl.mongodb.document;

import java.util.ArrayList;
import java.util.Collection;
import java.util.LinkedHashSet;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Queue;
import java.util.Set;
import java.util.regex.Pattern;

import com.mongodb.DBRef;
import com.querydsl.core.types.*;
import com.querydsl.mongodb.MongodbOps;
import org.bson.BsonJavaScript;
import org.bson.BsonRegularExpression;
import org.bson.Document;
import org.bson.types.ObjectId;

/**
 * Serializes the given Querydsl query to a Document query for MongoDB.
 *
 * @author Mark Paluch
 */
public abstract class MongodbDocumentSerializer implements Visitor {

    public Object handle(Expression expression) {
        return expression.accept(this, null);
    }

    public Document toSort(List> orderBys) {
        Document sort = new Document();
        for (OrderSpecifier orderBy : orderBys) {
            Object key = orderBy.getTarget().accept(this, null);
            sort.append(key.toString(), orderBy.getOrder() == Order.ASC ? 1 : -1);
        }
        return sort;
    }

    @Override
    public Object visit(Constant expr, Void context) {
        if (Enum.class.isAssignableFrom(expr.getType())) {
            @SuppressWarnings("unchecked") //Guarded by previous check
                    Constant> expectedExpr = (Constant>) expr;
            return expectedExpr.getConstant().name();
        } else {
            return expr.getConstant();
        }
    }

    @Override
    public Object visit(TemplateExpression expr, Void context) {
        throw new UnsupportedOperationException();
    }

    @Override
    public Object visit(FactoryExpression expr, Void context) {
        throw new UnsupportedOperationException();
    }

    protected String asDBKey(Operation expr, int index) {
        return (String) asDBValue(expr, index);
    }

    protected Object asDBValue(Operation expr, int index) {
        return expr.getArg(index).accept(this, null);
    }

    private String regexValue(Operation expr, int index) {
        return Pattern.quote(expr.getArg(index).accept(this, null).toString());
    }

    protected Document asDocument(String key, Object value) {
        return new Document(key, value);
    }

    @SuppressWarnings("unchecked")
    @Override
    public Object visit(Operation expr, Void context) {
        Operator op = expr.getOperator();
        if (op == Ops.EQ) {
            if (expr.getArg(0) instanceof Operation) {
                Operation lhs = (Operation) expr.getArg(0);
                if (lhs.getOperator() == Ops.COL_SIZE || lhs.getOperator() == Ops.ARRAY_SIZE) {
                    return asDocument(asDBKey(lhs, 0), asDocument("$size", asDBValue(expr, 1)));
                } else {
                    throw new UnsupportedOperationException("Illegal operation " + expr);
                }
            } else if (expr.getArg(0) instanceof Path) {
                Path path = (Path) expr.getArg(0);
                Constant constant = (Constant) expr.getArg(1);
                return asDocument(asDBKey(expr, 0), convert(path, constant));
            }
        } else if (op == Ops.STRING_IS_EMPTY) {
            return asDocument(asDBKey(expr, 0), "");

        } else if (op == Ops.AND) {
            Queue> pendingDocuments = collectConnectorArgs("$and", expr);
            List> unmergeableDocuments = new ArrayList>();
            List> generatedDocuments = new ArrayList>();

            while (!pendingDocuments.isEmpty()) {

                Map lhs = pendingDocuments.poll();

                for (Map rhs : pendingDocuments) {
                    Set