Contents. Osp::Base::Object Osp::Base::String Osp::Base::Buffer Osp::Base::DateTime

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1 Osp::Base

2 Contents Osp::Base::Object Osp::Base::String Osp::Base::Buffer Osp::Base::DateTime

3 Intorduction The Base namespace contains classes and interfaces around which the entire bada is built. All bada classes are derived from the Object class (or from its descendants), which is a part of the Base namespace. It also contains classes that encapsulate primitive types (data types and arrays) and Interfaces which are abstract classes that provide generic functionality. 3

4 1 Osp::Base::Object

5 Osp::Base::Object Object is the root base class of all bada classes It has the default constructor & destructor Except the classes with only static methods Member Functions bool Equals( const Object& obj ) Returns true if two objects are same Need reimplementation for real classes int GetHashCode( void ) Returns the hash value The default implementation returns its address. 5

6 C++ Type Wrappers & Other Classes Wrapper classes of C++ types and more Integral types Boolean (bool), Int8 (char), Short (short), Character (mchar), Integer (int), Long (long), LongLong (long long) Floating point types Float (float), Double (double) Array types String (string), Buffer (array), ByteBuffer (byte array) Compound & Etc DateTime, TimeSpan, UuId 6

7 2 Osp::Base::String

8 Osp::Base::String (1/7) Sequence of Unicode characters Mutable You can modify the content and length Initial size: 16 bytes Maximum length: 2^32-1 bytes Grow faster than real length (1.5) Basic functions Clear(), IsEmpty(), GetCapacity(), EnsureCapacity(int), SetCapacity(int) GetLength(), SetLength() 8

9 Osp::Base::String (2/7) Constructors with String, char*, mchar*, mchar, capacity String str( ascii string ); //A string literal with the prefix L is a wide string literal. String str2(l unicode string ); String strwithlength( 30 ); 9

10 Osp::Base::String (3/7) Getting mchar Functions operator [], GetCharAt(int), GetPointer() mchar ch; String str( ascii string ); ch = str[6]; // ch is s str.getcharat( 2, ch ); // ch is now c AppLog( %ls, str.getpointer() ); Note: %ls specifies the output to be wide-character string. 10

11 Osp::Base::String (4/7) Basic modification functions SetCharAt(..), operator [] str[6] = L S ; // str is ascii String str.setcharat(0, L A ); // str is Ascii String Format() str.format(50/*max len*/,l the value: %d,value); = str2 = str; 11

12 Osp::Base::String (5/7) More modification functions Append(..), operator +=, operator + String&, mchar*, double,... String str( L ); // str is str+=l = ; // str is = str.append( ); // str is = 20 str2 = str + L is right! Insert(..) str2.insert( 32, 5 ); // str2 is = 20 str2.insert( L 32, 12 ); // str2 is =

13 Osp::Base::String (6/7) Substring manipulation SubString(..) String str( a string ); String str2=str.substring(2,6); //str2 is string Replace(..) str.replace( string, sample ); // a sample Remove(..) str.remove( 0, 2 ); // str is sample 13

14 Osp::Base::String (7/7) Comparison CompareTo( String& ) Equals(String&, bool casesensitive), ==,!= StartsWith(..), EndsWith(..) Search IndexOf(..), LastIndexOf(..) String str( this is a string ); str.indexof( s, 4/*start*/, idx ); // idx is 6 str.lastindexof( i, 15, idx ); // idx is 13 Conversion Reverse(), ToLowerCase(), ToUpperCase() 14

15 Example: String Operations String str( L a string ); str.setcharat(l A, 0); // A string // print out the string to the console AppLog( [%ls],str.getpointer()); str.append( L is cool! ); // A string is cool! str.insert( L class, 8 ); // A string class is cool! str.remove( 0, 2 ); // string class is cool! str.insert( L The, 0 ); // The string class is cool! 15

16 Example: String Operations String str2; str2.format( 100, L 5 + %d is, 2); // is str2.append( (int)3 ); // is 3 // finding the index of the first appearing + int index; str2.indexof( L +, 0, index ); // index = 2 str2.setcharat( L -, index ); // 5-2 is 3 str2.replace( L is, L = ); // 5-2 = 3 str += str2; // The string class is cool!5-2 = 3 16

17 3 Osp::Base::Buffer

18 Osp::Base::Buffer Not just a simple array but a Buffer Position: where the data has been read or written Limit: the end of the meaningful data Remaining: the data between position and limit Mark: the storage for an index so that later the position can be set to that index. Capacity: the maximum number of elements Use pre-defined buffers instead of template IntBuffer, FloatBuffer, LongBuffer, McharBuffer 18

19 Osp::Base::Buffer Typical Operations SetPosition(..): move position Rewind(): position to 0 Flip(): limit to position, position to 0 Reset(): position to marker Query GetCapacity(), GetLimit(), GetMark(), GetPosition(), GetRemaining(), HasRemaining() Misc SetLimit(..), SetMark(..), SetPosition(..), ShiftLimit(..) 19

20 Osp::Base::Buffer Other functions Get()/Set(): data at position (relative) Get()/Set(), operator []: at an index (absolute) GetArray(), SetArray(), GetPointer() ReadFrom(): get data from another (larger) buffer Equals(), operator ==, operator!= 20

21 Example: Buffer Operations IntBuffer buffer, buffer2; buffer.construct( 1024 ); int array[] = {1,2,3,4,5,6,7,8,9,10}; // Initializing buffer data. The size is changed to 10 buffer.setarray( array, 0, sizeof(array)/sizeof(int) ); buffer.flip(); while( buffer.hasremaining() ) { int val; buffer.get(val);//the position steps forward AppLog( [%d],val); } // will print

22 Example: Buffer Operations // buffer is [ ] buffer.setposition(6); buffer2.construct(2); //creating buffer with 2 elements buffer2.readfrom(buffer); // buffer2 is [7 8] buffer2.rewind(); buffer2.readfrom(buffer); // buffer2 is [9 10] 22

23 4 Osp::Base::DateTime

24 Osp::Base::DateTime & TimeSpan DateTime is for absolute time Range is from 12:00:00 am Jan 1, 1 to 11:59:59 pm Dec 31, 9999 Holds Year, month, day, hour, minutes, & seconds information TimeSpan is for time interval Difference between two DateTime s In milliseconds 24

25 Osp::Base::DateTime Operations Addition Add time span, years, months, days, hours, minutes, seconds Subtract time span Comparison CompareTo(), Equals(), operators <, <=,!=, ==, Setting/Getting GetHour(), SetHour(),... Getting TimeSpan GetTime(): time span from GetMinValue() GetTimeOfDay(): time span from the midnight of the day Misc ToString(), IsLeapYear(), GetDaysInMonth(), Parse() 25

26 Osp::Base::TimeSpan Operations Getting GetDays(), GetHours(), GetMinutes(), GetSeconds(), GetMilliseconds(), GetTicks() Comparison Equals(), operator <, <=, ==,!=, >=, > Addition, subtraction operator +, operator - Sign Duration() (absolute value), Negate() 26

27 5 Osp::Base::Uuid

28 Osp::Base::UuId Universally Unique Identifier Functions Equals(), operator!=, == ToString(), Parse() ToUUID() Constructors with UUID, UuId 28

29 Summary Object is the base class of all classes. All C base types are wrapped by classes. String class supports variety operations. Buffer class is not mere array class but more sophisticated buffering class. bada has it s classes for date/times operations. 29

Class Library java.lang Package. Bok, Jong Soon

Class Library java.lang Package Bok, Jong Soon javaexpert@nate.com www.javaexpert.co.kr Object class Is the root of the class hierarchy. Every class has Object as a superclass. If no inheritance is specified