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 /*

 **********************************************************************

 *   Copyright (C) 1999-2013, International Business Machines

 *   Corporation and others.  All Rights Reserved.

 **********************************************************************

 *   Date        Name        Description

 *   10/22/99    alan        Creation.  This is an internal header.

 *                           It should not be exported.

 **********************************************************************

 */

 #ifndef UVECTOR_H

 #define UVECTOR_H

 #include "unicode/utypes.h"

 #include "unicode/uobject.h"

 #include "cmemory.h"

 #include "uarrsort.h"

 #include "uelement.h"

 U_NAMESPACE_BEGIN

 /**

  * <p>Ultralightweight C++ implementation of a <tt>void*</tt> vector

  * that is (mostly) compatible with java.util.Vector.

  *

  * <p>This is a very simple implementation, written to satisfy an

  * immediate porting need.  As such, it is not completely fleshed out,

  * and it aims for simplicity and conformity.  Nonetheless, it serves

  * its purpose (porting code from java that uses java.util.Vector)

  * well, and it could be easily made into a more robust vector class.

  *

  * <p><b>Design notes</b>

  *

  * <p>There is index bounds checking, but little is done about it.  If

  * indices are out of bounds, either nothing happens, or zero is

  * returned.  We <em>do</em> avoid indexing off into the weeds.

  *

  * <p>There is detection of out of memory, but the handling is very

  * coarse-grained -- similar to UnicodeString's protocol, but even

  * coarser.  The class contains <em>one static flag</em> that is set

  * when any call to <tt>new</tt> returns zero.  This allows the caller

  * to use several vectors and make just one check at the end to see if

  * a memory failure occurred.  This is more efficient than making a

  * check after each call on each vector when doing many operations on

  * multiple vectors.  The single static flag works best when memory

  * failures are infrequent, and when recovery options are limited or

  * nonexistent.

  *

  * <p>Since we don't have garbage collection, UVector was given the

  * option to <em>own</em>its contents.  To employ this, set a deleter

  * function.  The deleter is called on a void* pointer when that

  * pointer is released by the vector, either when the vector itself is

  * destructed, or when a call to setElementAt() overwrites an element,

  * or when a call to remove() or one of its variants explicitly

  * removes an element.  If no deleter is set, or the deleter is set to

  * zero, then it is assumed that the caller will delete elements as

  * needed.

  *

  * <p>In order to implement methods such as contains() and indexOf(),

  * UVector needs a way to compare objects for equality.  To do so, it

  * uses a comparison frunction, or "comparer."  If the comparer is not

  * set, or is set to zero, then all such methods will act as if the

  * vector contains no element.  That is, indexOf() will always return

  * -1, contains() will always return FALSE, etc.

  *

  * <p><b>To do</b>

  *

  * <p>Improve the handling of index out of bounds errors.

  *

  * @author Alan Liu

  */

 class U_COMMON_API UVector : public UObject {

     // NOTE: UVector uses the UHashKey (union of void* and int32_t) as

     // its basic storage type.  It uses UElementsAreEqual as its

     // comparison function.  It uses UObjectDeleter as its deleter

     // function.  These are named for hashtables, but used here as-is

     // rather than duplicating the type.  This allows sharing of

     // support functions.

 private:

     int32_t count;

     int32_t capacity;

     UElement* elements;

     UObjectDeleter *deleter;

     UElementsAreEqual *comparer;

 public:

     UVector(UErrorCode &status);

     UVector(int32_t initialCapacity, UErrorCode &status);

     UVector(UObjectDeleter *d, UElementsAreEqual *c, UErrorCode &status);

     UVector(UObjectDeleter *d, UElementsAreEqual *c, int32_t initialCapacity, UErrorCode &status);

     virtual ~UVector();

     /**

      * Assign this object to another (make this a copy of 'other').

      * Use the 'assign' function to assign each element.

      */

     void assign(const UVector& other, UElementAssigner *assign, UErrorCode &ec);

     /**

      * Compare this vector with another.  They will be considered

      * equal if they are of the same size and all elements are equal,

      * as compared using this object's comparer.

      */

     UBool operator==(const UVector& other);

     /**

      * Equivalent to !operator==()

      */

     inline UBool operator!=(const UVector& other);

     //------------------------------------------------------------

     // java.util.Vector API

     //------------------------------------------------------------

     void addElement(void* obj, UErrorCode &status);

     void addElement(int32_t elem, UErrorCode &status);

     void setElementAt(void* obj, int32_t index);

     void setElementAt(int32_t elem, int32_t index);

     void insertElementAt(void* obj, int32_t index, UErrorCode &status);

     void insertElementAt(int32_t elem, int32_t index, UErrorCode &status);

     void* elementAt(int32_t index) const;

     int32_t elementAti(int32_t index) const;

     UBool equals(const UVector &other) const;

     void* firstElement(void) const;

     void* lastElement(void) const;

     int32_t lastElementi(void) const;

     int32_t indexOf(void* obj, int32_t startIndex = 0) const;

     int32_t indexOf(int32_t obj, int32_t startIndex = 0) const;

     UBool contains(void* obj) const;

     UBool contains(int32_t obj) const;

     UBool containsAll(const UVector& other) const;

     UBool removeAll(const UVector& other);

     UBool retainAll(const UVector& other);

     void removeElementAt(int32_t index);

     UBool removeElement(void* obj);

     void removeAllElements();

     int32_t size(void) const;

     UBool isEmpty(void) const;

     UBool ensureCapacity(int32_t minimumCapacity, UErrorCode &status);

     /**

      * Change the size of this vector as follows: If newSize is

      * smaller, then truncate the array, possibly deleting held

      * elements for i >= newSize.  If newSize is larger, grow the

      * array, filling in new slots with NULL.

      */

     void setSize(int32_t newSize, UErrorCode &status);

     /**

      * Fill in the given array with all elements of this vector.

      */

     void** toArray(void** result) const;

     //------------------------------------------------------------

     // New API

     //------------------------------------------------------------

     UObjectDeleter *setDeleter(UObjectDeleter *d);

     UElementsAreEqual *setComparer(UElementsAreEqual *c);

     void* operator[](int32_t index) const;

     /**

      * Removes the element at the given index from this vector and

      * transfer ownership of it to the caller.  After this call, the

      * caller owns the result and must delete it and the vector entry

      * at 'index' is removed, shifting all subsequent entries back by

      * one index and shortening the size of the vector by one.  If the

      * index is out of range or if there is no item at the given index

      * then 0 is returned and the vector is unchanged.

      */

     void* orphanElementAt(int32_t index);

     /**

      * Returns true if this vector contains none of the elements

      * of the given vector.

      * @param other vector to be checked for containment

      * @return true if the test condition is met

      */

     UBool containsNone(const UVector& other) const;

     /**

      * Insert the given object into this vector at its sorted position

      * as defined by 'compare'.  The current elements are assumed to

      * be sorted already.

      */

     void sortedInsert(void* obj, UElementComparator *compare, UErrorCode& ec);

     /**

      * Insert the given integer into this vector at its sorted position

      * as defined by 'compare'.  The current elements are assumed to

      * be sorted already.

      */

     void sortedInsert(int32_t obj, UElementComparator *compare, UErrorCode& ec);

     /**

      * Sort the contents of the vector, assuming that the contents of the

      * vector are of type int32_t.

      */

     void sorti(UErrorCode &ec);

     /**

       * Sort the contents of this vector, using a caller-supplied function

       * to do the comparisons.  (It's confusing that

       *  UVector's UElementComparator function is different from the

       *  UComparator function type defined in uarrsort.h)

       */

     void sort(UElementComparator *compare, UErrorCode &ec);

     /**

      * Stable sort the contents of this vector using a caller-supplied function

      * of type UComparator to do the comparison.  Provides more flexibility

      * than UVector::sort() because an additional user parameter can be passed to

      * the comparison function.

      */

     void sortWithUComparator(UComparator *compare, const void *context, UErrorCode &ec);

     /**

      * ICU "poor man's RTTI", returns a UClassID for this class.

      */

     static UClassID U_EXPORT2 getStaticClassID();

     /**

      * ICU "poor man's RTTI", returns a UClassID for the actual class.

      */

     virtual UClassID getDynamicClassID() const;

 private:

     void _init(int32_t initialCapacity, UErrorCode &status);

     int32_t indexOf(UElement key, int32_t startIndex = 0, int8_t hint = 0) const;

     void sortedInsert(UElement e, UElementComparator *compare, UErrorCode& ec);

     // Disallow

     UVector(const UVector&);

     // Disallow

     UVector& operator=(const UVector&);

 };

 /**

  * <p>Ultralightweight C++ implementation of a <tt>void*</tt> stack

  * that is (mostly) compatible with java.util.Stack.  As in java, this

  * is merely a paper thin layer around UVector.  See the UVector

  * documentation for further information.

  *

  * <p><b>Design notes</b>

  *

  * <p>The element at index <tt>n-1</tt> is (of course) the top of the

  * stack.

  *

  * <p>The poorly named <tt>empty()</tt> method doesn't empty the

  * stack; it determines if the stack is empty.

  *

  * @author Alan Liu

  */

 class U_COMMON_API UStack : public UVector {

 public:

     UStack(UErrorCode &status);

     UStack(int32_t initialCapacity, UErrorCode &status);

     UStack(UObjectDeleter *d, UElementsAreEqual *c, UErrorCode &status);

     UStack(UObjectDeleter *d, UElementsAreEqual *c, int32_t initialCapacity, UErrorCode &status);

     virtual ~UStack();

     // It's okay not to have a virtual destructor (in UVector)

     // because UStack has no special cleanup to do.

     UBool empty(void) const;

     void* peek(void) const;

     int32_t peeki(void) const;

     void* pop(void);

     int32_t popi(void);

     void* push(void* obj, UErrorCode &status);

     int32_t push(int32_t i, UErrorCode &status);

     /*

     If the object o occurs as an item in this stack,

     this method returns the 1-based distance from the top of the stack.

     */

     int32_t search(void* obj) const;

     /**

      * ICU "poor man's RTTI", returns a UClassID for this class.

      */

     static UClassID U_EXPORT2 getStaticClassID();

     /**

      * ICU "poor man's RTTI", returns a UClassID for the actual class.

      */

     virtual UClassID getDynamicClassID() const;

 private:

     // Disallow

     UStack(const UStack&);

     // Disallow

     UStack& operator=(const UStack&);

 };

 // UVector inlines

 inline int32_t UVector::size(void) const {

     return count;

 }

 inline UBool UVector::isEmpty(void) const {

     return count == 0;

 }

 inline UBool UVector::contains(void* obj) const {

     return indexOf(obj) >= 0;

 }

 inline UBool UVector::contains(int32_t obj) const {

     return indexOf(obj) >= 0;

 }

 inline void* UVector::firstElement(void) const {

     return elementAt(0);

 }

 inline void* UVector::lastElement(void) const {

     return elementAt(count-1);

 }

 inline int32_t UVector::lastElementi(void) const {

     return elementAti(count-1);

 }

 inline void* UVector::operator[](int32_t index) const {

     return elementAt(index);

 }

 inline UBool UVector::operator!=(const UVector& other) {

     return !operator==(other);

 }

 // UStack inlines

 inline UBool UStack::empty(void) const {

     return isEmpty();

 }

 inline void* UStack::peek(void) const {

     return lastElement();

 }

 inline int32_t UStack::peeki(void) const {

     return lastElementi();

 }

 inline void* UStack::push(void* obj, UErrorCode &status) {

     addElement(obj, status);

     return obj;

 }

 inline int32_t UStack::push(int32_t i, UErrorCode &status) {

     addElement(i, status);

     return i;

 }

 U_NAMESPACE_END

 #endif