mirror of
https://github.com/mongodb/mongo.git
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548 lines
17 KiB
C++
548 lines
17 KiB
C++
// BSONElement
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/* Copyright 2009 10gen Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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#include <vector>
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#include <string.h>
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namespace bson {
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typedef mongo::BSONElement be;
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typedef mongo::BSONObj bo;
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typedef mongo::BSONObjBuilder bob;
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}
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namespace mongo {
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class OpTime;
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class BSONElement;
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/* l and r MUST have same type when called: check that first. */
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int compareElementValues(const BSONElement& l, const BSONElement& r);
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/** BSONElement represents an "element" in a BSONObj. So for the object { a : 3, b : "abc" },
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'a : 3' is the first element (key+value).
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The BSONElement object points into the BSONObj's data. Thus the BSONObj must stay in scope
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for the life of the BSONElement.
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internals:
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<type><fieldName ><value>
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-------- size() ------------
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-fieldNameSize-
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value()
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type()
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*/
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class BSONElement {
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public:
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/** These functions, which start with a capital letter, throw a UserException if the
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element is not of the required type. Example:
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string foo = obj["foo"].String(); // exception if not a string type or DNE
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*/
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string String() const { return chk(mongo::String).valuestr(); }
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Date_t Date() const { return chk(mongo::Date).date(); }
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double Number() const { return chk(isNumber()).number(); }
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double Double() const { return chk(NumberDouble)._numberDouble(); }
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long long Long() const { return chk(NumberLong)._numberLong(); }
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int Int() const { return chk(NumberInt)._numberInt(); }
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bool Bool() const { return chk(mongo::Bool).boolean(); }
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BSONObj Obj() const;
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vector<BSONElement> Array() const; // see implementation for detailed comments
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mongo::OID OID() const { return chk(jstOID).__oid(); }
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void Null() const { chk(isNull()); }
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void OK() const { chk(ok()); }
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/** populate v with the value of the element. If type does not match, throw exception.
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useful in templates -- see also BSONObj::Vals().
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*/
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void Val(Date_t& v) const { v = Date(); }
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void Val(long long& v) const { v = Long(); }
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void Val(bool& v) const { v = Bool(); }
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void Val(BSONObj& v) const;
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void Val(mongo::OID& v) const { v = OID(); }
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void Val(int& v) const { v = Int(); }
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void Val(double& v) const { v = Double(); }
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void Val(string& v) const { v = String(); }
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/** Use ok() to check if a value is assigned:
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if( myObj["foo"].ok() ) ...
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*/
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bool ok() const { return !eoo(); }
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string toString( bool includeFieldName = true, bool full=false) const;
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operator string() const { return toString(); }
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string jsonString( JsonStringFormat format, bool includeFieldNames = true, int pretty = 0 ) const;
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/** Returns the type of the element */
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BSONType type() const { return (BSONType) *data; }
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/** retrieve a field within this element
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throws exception if *this is not an embedded object
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*/
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BSONElement operator[] (const string& field) const;
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/** returns the tyoe of the element fixed for the main type
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the main purpose is numbers. any numeric type will return NumberDouble
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Note: if the order changes, indexes have to be re-built or than can be corruption
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*/
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int canonicalType() const;
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/** Indicates if it is the end-of-object element, which is present at the end of
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every BSON object.
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*/
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bool eoo() const { return type() == EOO; }
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/** Size of the element.
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@param maxLen If maxLen is specified, don't scan more than maxLen bytes to calculate size.
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*/
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int size( int maxLen = -1 ) const;
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/** Wrap this element up as a singleton object. */
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BSONObj wrap() const;
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/** Wrap this element up as a singleton object with a new name. */
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BSONObj wrap( const char* newName) const;
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/** field name of the element. e.g., for
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name : "Joe"
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"name" is the fieldname
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*/
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const char * fieldName() const {
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if ( eoo() ) return ""; // no fieldname for it.
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return data + 1;
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}
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/** raw data of the element's value (so be careful). */
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const char * value() const {
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return (data + fieldNameSize() + 1);
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}
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/** size in bytes of the element's value (when applicable). */
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int valuesize() const {
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return size() - fieldNameSize() - 1;
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}
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bool isBoolean() const { return type() == mongo::Bool; }
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/** @return value of a boolean element.
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You must assure element is a boolean before
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calling. */
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bool boolean() const {
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return *value() ? true : false;
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}
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/** Retrieve a java style date value from the element.
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Ensure element is of type Date before calling.
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*/
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Date_t date() const {
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return *reinterpret_cast< const Date_t* >( value() );
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}
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/** Convert the value to boolean, regardless of its type, in a javascript-like fashion
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(i.e., treat zero and null as false).
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*/
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bool trueValue() const;
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/** True if number, string, bool, date, OID */
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bool isSimpleType() const;
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/** True if element is of a numeric type. */
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bool isNumber() const;
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/** Return double value for this field. MUST be NumberDouble type. */
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double _numberDouble() const {return *reinterpret_cast< const double* >( value() ); }
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/** Return double value for this field. MUST be NumberInt type. */
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int _numberInt() const {return *reinterpret_cast< const int* >( value() ); }
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/** Return double value for this field. MUST be NumberLong type. */
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long long _numberLong() const {return *reinterpret_cast< const long long* >( value() ); }
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/** Retrieve int value for the element safely. Zero returned if not a number. */
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int numberInt() const;
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/** Retrieve long value for the element safely. Zero returned if not a number. */
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long long numberLong() const;
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/** Retrieve the numeric value of the element. If not of a numeric type, returns 0.
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Note: casts to double, data loss may occur with large (>52 bit) NumberLong values.
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*/
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double numberDouble() const;
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/** Retrieve the numeric value of the element. If not of a numeric type, returns 0.
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Note: casts to double, data loss may occur with large (>52 bit) NumberLong values.
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*/
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double number() const { return numberDouble(); }
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/** Retrieve the object ID stored in the object.
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You must ensure the element is of type jstOID first. */
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const mongo::OID &__oid() const { return *reinterpret_cast< const mongo::OID* >( value() ); }
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/** True if element is null. */
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bool isNull() const {
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return type() == jstNULL;
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}
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/** Size (length) of a string element.
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You must assure of type String first. */
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int valuestrsize() const {
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return *reinterpret_cast< const int* >( value() );
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}
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// for objects the size *includes* the size of the size field
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int objsize() const {
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return *reinterpret_cast< const int* >( value() );
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}
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/** Get a string's value. Also gives you start of the real data for an embedded object.
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You must assure data is of an appropriate type first -- see also valuestrsafe().
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*/
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const char * valuestr() const {
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return value() + 4;
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}
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/** Get the string value of the element. If not a string returns "". */
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const char *valuestrsafe() const {
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return type() == mongo::String ? valuestr() : "";
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}
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/** Get the string value of the element. If not a string returns "". */
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string str() const {
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return type() == mongo::String ? string(valuestr(), valuestrsize()-1) : string();
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}
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/** Get javascript code of a CodeWScope data element. */
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const char * codeWScopeCode() const {
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return value() + 8;
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}
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/** Get the scope SavedContext of a CodeWScope data element. */
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const char * codeWScopeScopeData() const {
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// TODO fix
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return codeWScopeCode() + strlen( codeWScopeCode() ) + 1;
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}
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/** Get the embedded object this element holds. */
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BSONObj embeddedObject() const;
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/* uasserts if not an object */
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BSONObj embeddedObjectUserCheck() const;
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BSONObj codeWScopeObject() const;
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/** Get raw binary data. Element must be of type BinData. Doesn't handle type 2 specially */
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const char *binData(int& len) const {
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// BinData: <int len> <byte subtype> <byte[len] data>
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assert( type() == BinData );
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len = valuestrsize();
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return value() + 5;
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}
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/** Get binary data. Element must be of type BinData. Handles type 2 */
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const char *binDataClean(int& len) const {
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// BinData: <int len> <byte subtype> <byte[len] data>
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if (binDataType() != ByteArrayDeprecated){
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return binData(len);
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} else {
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// Skip extra size
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len = valuestrsize() - 4;
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return value() + 5 + 4;
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}
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}
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BinDataType binDataType() const {
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// BinData: <int len> <byte subtype> <byte[len] data>
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assert( type() == BinData );
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unsigned char c = (value() + 4)[0];
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return (BinDataType)c;
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}
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/** Retrieve the regex string for a Regex element */
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const char *regex() const {
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assert(type() == RegEx);
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return value();
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}
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/** Retrieve the regex flags (options) for a Regex element */
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const char *regexFlags() const {
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const char *p = regex();
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return p + strlen(p) + 1;
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}
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/** like operator== but doesn't check the fieldname,
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just the value.
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*/
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bool valuesEqual(const BSONElement& r) const {
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return woCompare( r , false ) == 0;
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}
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/** Returns true if elements are equal. */
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bool operator==(const BSONElement& r) const {
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return woCompare( r , true ) == 0;
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}
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/** Well ordered comparison.
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@return <0: l<r. 0:l==r. >0:l>r
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order by type, field name, and field value.
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If considerFieldName is true, pay attention to the field name.
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*/
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int woCompare( const BSONElement &e, bool considerFieldName = true ) const;
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const char * rawdata() const {
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return data;
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}
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/** 0 == Equality, just not defined yet */
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int getGtLtOp( int def = 0 ) const;
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/** Constructs an empty element */
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BSONElement();
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/** Check that data is internally consistent. */
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void validate() const;
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/** True if this element may contain subobjects. */
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bool mayEncapsulate() const {
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switch ( type() ){
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case Object:
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case mongo::Array:
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case CodeWScope:
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return true;
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default:
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return false;
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}
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}
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/** True if this element can be a BSONObj */
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bool isABSONObj() const {
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switch( type() ){
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case Object:
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case mongo::Array:
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return true;
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default:
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return false;
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}
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}
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Date_t timestampTime() const{
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unsigned long long t = ((unsigned int*)(value() + 4 ))[0];
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return t * 1000;
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}
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unsigned int timestampInc() const{
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return ((unsigned int*)(value() ))[0];
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}
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const char * dbrefNS() const {
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uassert( 10063 , "not a dbref" , type() == DBRef );
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return value() + 4;
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}
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const mongo::OID& dbrefOID() const {
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uassert( 10064 , "not a dbref" , type() == DBRef );
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const char * start = value();
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start += 4 + *reinterpret_cast< const int* >( start );
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return *reinterpret_cast< const mongo::OID* >( start );
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}
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bool operator<( const BSONElement& other ) const {
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int x = (int)canonicalType() - (int)other.canonicalType();
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if ( x < 0 ) return true;
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else if ( x > 0 ) return false;
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return compareElementValues(*this,other) < 0;
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}
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// If maxLen is specified, don't scan more than maxLen bytes.
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explicit BSONElement(const char *d, int maxLen = -1) : data(d) {
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fieldNameSize_ = -1;
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if ( eoo() )
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fieldNameSize_ = 0;
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else {
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if ( maxLen != -1 ) {
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int size = (int) strnlen( fieldName(), maxLen - 1 );
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massert( 10333 , "Invalid field name", size != -1 );
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fieldNameSize_ = size + 1;
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}
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}
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totalSize = -1;
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}
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string _asCode() const;
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OpTime _opTime() const;
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private:
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const char *data;
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mutable int fieldNameSize_; // cached value
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int fieldNameSize() const {
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if ( fieldNameSize_ == -1 )
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fieldNameSize_ = (int)strlen( fieldName() ) + 1;
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return fieldNameSize_;
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}
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mutable int totalSize; /* caches the computed size */
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friend class BSONObjIterator;
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friend class BSONObj;
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const BSONElement& chk(int t) const {
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if ( t != type() ){
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stringstream ss;
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ss << "wrong type for BSONElement (" << fieldName() << ") " << type() << " != " << t;
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uasserted(13111, ss.str() );
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}
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return *this;
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}
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const BSONElement& chk(bool expr) const {
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uassert(13118, "unexpected or missing type value in BSON object", expr);
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return *this;
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}
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};
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inline int BSONElement::canonicalType() const {
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BSONType t = type();
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switch ( t ){
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case MinKey:
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case MaxKey:
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return t;
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case EOO:
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case Undefined:
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return 0;
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case jstNULL:
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return 5;
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case NumberDouble:
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case NumberInt:
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case NumberLong:
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return 10;
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case mongo::String:
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case Symbol:
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return 15;
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case Object:
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return 20;
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case mongo::Array:
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return 25;
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case BinData:
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return 30;
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case jstOID:
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return 35;
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case mongo::Bool:
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return 40;
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case mongo::Date:
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case Timestamp:
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return 45;
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case RegEx:
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return 50;
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case DBRef:
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return 55;
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case Code:
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return 60;
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case CodeWScope:
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return 65;
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default:
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assert(0);
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return -1;
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}
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}
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inline bool BSONElement::trueValue() const {
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switch( type() ) {
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case NumberLong:
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return *reinterpret_cast< const long long* >( value() ) != 0;
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case NumberDouble:
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return *reinterpret_cast< const double* >( value() ) != 0;
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case NumberInt:
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return *reinterpret_cast< const int* >( value() ) != 0;
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case mongo::Bool:
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return boolean();
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case EOO:
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case jstNULL:
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case Undefined:
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return false;
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default:
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;
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}
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return true;
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}
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/** True if element is of a numeric type. */
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inline bool BSONElement::isNumber() const {
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switch( type() ) {
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case NumberLong:
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case NumberDouble:
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case NumberInt:
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return true;
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default:
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return false;
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}
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}
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inline bool BSONElement::isSimpleType() const {
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switch( type() ){
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case NumberLong:
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case NumberDouble:
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case NumberInt:
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case mongo::String:
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case mongo::Bool:
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case mongo::Date:
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case jstOID:
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return true;
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default:
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return false;
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}
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}
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inline double BSONElement::numberDouble() const {
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switch( type() ) {
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case NumberDouble:
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return _numberDouble();
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case NumberInt:
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return *reinterpret_cast< const int* >( value() );
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case NumberLong:
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return (double) *reinterpret_cast< const long long* >( value() );
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default:
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return 0;
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}
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}
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/** Retrieve int value for the element safely. Zero returned if not a number. */
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inline int BSONElement::numberInt() const {
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switch( type() ) {
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case NumberDouble:
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return (int) _numberDouble();
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case NumberInt:
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return _numberInt();
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case NumberLong:
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return (int) _numberLong();
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default:
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return 0;
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}
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}
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/** Retrieve long value for the element safely. Zero returned if not a number. */
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inline long long BSONElement::numberLong() const {
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switch( type() ) {
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case NumberDouble:
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return (long long) _numberDouble();
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case NumberInt:
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return _numberInt();
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case NumberLong:
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return _numberLong();
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default:
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return 0;
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}
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}
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inline BSONElement::BSONElement() {
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static char z = 0;
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data = &z;
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fieldNameSize_ = 0;
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totalSize = 1;
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}
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}
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