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• 6.6
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• MongodbDocumentSerializer.java

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

/*
 * 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 com.mongodb.DBRef;
import com.querydsl.core.types.Constant;
import com.querydsl.core.types.Expression;
import com.querydsl.core.types.ExpressionUtils;
import com.querydsl.core.types.FactoryExpression;
import com.querydsl.core.types.Operation;
import com.querydsl.core.types.Ops;
import com.querydsl.core.types.Order;
import com.querydsl.core.types.OrderSpecifier;
import com.querydsl.core.types.ParamExpression;
import com.querydsl.core.types.Path;
import com.querydsl.core.types.PathMetadata;
import com.querydsl.core.types.PathType;
import com.querydsl.core.types.SubQueryExpression;
import com.querydsl.core.types.TemplateExpression;
import com.querydsl.core.types.Visitor;
import com.querydsl.mongodb.MongodbOps;
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 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) {
    var 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) {
    var 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) {
      var pendingDocuments = collectConnectorArgs("$and", expr);
      List> unmergeableDocuments = new ArrayList<>();
      List> generatedDocuments = new ArrayList<>();

      while (!pendingDocuments.isEmpty()) {

        var lhs = pendingDocuments.poll();

        for (Map rhs : pendingDocuments) {
          Set