org.springframework.data.mongodb.repository.query.StringBasedMongoQuery.java Source code

Introduction

Here is the source code for org.springframework.data.mongodb.repository.query.StringBasedMongoQuery.java

Source

/*
 * Copyright 2011 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 org.springframework.data.mongodb.repository.query;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.data.mongodb.core.MongoOperations;
import org.springframework.data.mongodb.core.query.BasicQuery;
import org.springframework.data.mongodb.core.query.Query;

import com.mongodb.util.JSON;

/**
 * Query to use a plain JSON String to create the {@link Query} to actually execute.
 * 
 * @author Oliver Gierke
 */
public class StringBasedMongoQuery extends AbstractMongoQuery {

    private static final Pattern PLACEHOLDER = Pattern.compile("\\?(\\d+)");
    private static final Log LOG = LogFactory.getLog(StringBasedMongoQuery.class);

    private final String query;
    private final String fieldSpec;

    /**
     * Creates a new {@link StringBasedMongoQuery}.
     * 
     * @param method
     * @param template
     */
    public StringBasedMongoQuery(String query, MongoQueryMethod method, MongoOperations mongoOperations) {
        super(method, mongoOperations);
        this.query = query;
        this.fieldSpec = method.getFieldSpecification();
    }

    public StringBasedMongoQuery(MongoQueryMethod method, MongoOperations mongoOperations) {
        this(method.getAnnotatedQuery(), method, mongoOperations);
    }

    /*
     * (non-Javadoc)
     * @see org.springframework.data.mongodb.repository.query.AbstractMongoQuery#createQuery(org.springframework.data.mongodb.repository.query.ConvertingParameterAccessor)
     */
    @Override
    protected Query createQuery(ConvertingParameterAccessor accessor) {

        String queryString = replacePlaceholders(query, accessor);

        Query query = null;

        if (fieldSpec != null) {
            String fieldString = replacePlaceholders(fieldSpec, accessor);
            query = new BasicQuery(queryString, fieldString);
        } else {
            query = new BasicQuery(queryString);
        }

        QueryUtils.applySorting(query, accessor.getSort());

        if (LOG.isDebugEnabled()) {
            LOG.debug(String.format("Created query %s", query.getQueryObject()));
        }

        return query;
    }

    private String replacePlaceholders(String input, ConvertingParameterAccessor accessor) {

        Matcher matcher = PLACEHOLDER.matcher(input);
        String result = input;

        while (matcher.find()) {
            String group = matcher.group();
            int index = Integer.parseInt(matcher.group(1));
            result = result.replace(group, getParameterWithIndex(accessor, index));
        }

        return result;
    }

    private String getParameterWithIndex(ConvertingParameterAccessor accessor, int index) {
        return JSON.serialize(accessor.getBindableValue(index));
    }
}