Mega Code Archive
Int Array
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/*
* Copyright (c) 2002-2008 "Neo Technology,"
* Network Engine for Objects in Lund AB [http://neotechnology.com]
*
* This file is part of Neo4j.
*
* Neo4j is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
import java.util.HashSet;
import java.util.Set;
public class IntArray
{
private int[] rels;
private int arrayCount = 0;
public IntArray()
{
rels = new int[2];
}
public IntArray( int initialCapacity )
{
rels = new int[ initialCapacity ];
}
public IntArray( int[] array )
{
rels = array;
arrayCount = array.length;
}
public void add( int id )
{
if ( arrayCount == rels.length )
{
int newRels[] = new int[rels.length * 2];
System.arraycopy( rels, 0, newRels, 0, rels.length );
rels = newRels;
}
rels[arrayCount++] = id;
}
public void addAll( IntArray array )
{
if ( array == null )
{
return;
}
if ( array.length() + arrayCount > rels.length )
{
int newSize = rels.length * 2;
while ( array.length() + arrayCount > newSize )
{
newSize = newSize * 2;
}
int newRels[] = new int[newSize];
System.arraycopy( rels, 0, newRels, 0, arrayCount );
rels = newRels;
}
System.arraycopy( array.getArray(), 0, rels, arrayCount,
array.length() );
arrayCount += array.length();
}
public int length()
{
return arrayCount;
}
public int[] getArray()
{
return rels;
}
public int get( int i )
{
assert i >= 0 && i < arrayCount;
return rels[i];
}
public static IntArray composeNew( IntArray src, IntArray add,
IntArray remove )
{
if ( remove == null )
{
if ( src == null )
{
return add;
}
if ( add != null )
{
IntArray newArray = new IntArray( add.length() + src.length() );
newArray.addAll( src );
newArray.addAll( add );
return newArray;
}
return src;
}
else
{
if ( src == null && add == null )
{
return null;
}
int newLength = 0;
if ( add != null )
{
newLength += add.length();
}
if ( src != null )
{
newLength += src.length();
}
IntArray newArray = new IntArray( newLength );
Set<Integer> set = new HashSet<Integer>( remove.length() + 1,
1.0f );
for ( int i = 0; i < remove.length(); i++ )
{
set.add( remove.get( i ) );
}
newArray.addAll( src );
for ( int i = 0; i < newArray.length(); i++ )
{
int value = newArray.get( i );
if ( set.contains( value ) )
{
boolean swapSuccessful = false;
for ( int j = newArray.length() - 1; j >= i + 1; j--)
{
int backValue = newArray.get( j );
newArray.arrayCount--;
if ( !set.contains( backValue) )
{
newArray.getArray()[i] = backValue;
swapSuccessful = true;
break;
}
}
if ( !swapSuccessful ) // all elements from pos in remove
{
newArray.arrayCount--;
}
}
}
if ( add != null )
{
for ( int i = 0; i < add.length(); i++ )
{
int value = add.get( i );
if ( !set.contains( value ) )
{
newArray.add( value );
}
}
}
return newArray;
}
}
/* public static IntArray composeNew( IntArray src, IntArray add,
IntArray remove )
{
if ( remove == null )
{
if ( src == null )
{
return add;
}
if ( add != null )
{
IntArray newArray = new IntArray( add.length() + src.length() );
newArray.addAll( src );
newArray.addAll( add );
return newArray;
}
return src;
}
else
{
if ( src == null )
{
return null;
}
// TODO: merge add and remove array then append add array to result
int[] newArray = new int[src.length()];
int[] srcArray = src.getArray();
int[] removeArray = remove.getArray();
assert removeArray.length <= srcArray.length;
System.arraycopy( srcArray, 0, newArray, 0, src.length() );
Arrays.sort( newArray );
Arrays.sort( removeArray );
int newArraySize = newArray.length;
int startSearchFrom = 0;
int checkTo = removeArray.length; // can decrease if we swap
for ( int i = 0; i < checkTo; i++ )
{
int index = binarySearch( newArray, startSearchFrom,
newArraySize, removeArray[i] );
if ( index >= 0 )
{
// next search can start from here
startSearchFrom = index + 1;
// find element we can swap with
for ( int j = newArraySize - 1; j >= startSearchFrom; j-- )
{
int swapValue = newArray[j];
int rIndex = binarySearch( removeArray, i, checkTo,
swapValue );
newArraySize--;
// ok last element in newArray ==
// last element in removeArray
if ( rIndex > 0 )
{
checkTo--;
// continue with second last to see if that is
// swapable
}
else // we swap with this element
{
newArray[index] = newArray[j];
break;
}
}
}
}
IntArray newIntArray = new IntArray( newArray );
newIntArray.arrayCount = newArraySize;
return newIntArray;
}
}
private static int binarySearch( int[] array, int startOffset,
int endOffset, int value )
{
int pIndex = startOffset + ( endOffset - startOffset ) / 2;
int valueFound = array[pIndex];
if ( valueFound == value )
{
return pIndex;
}
if ( pIndex == startOffset ) // search exhausted
{
return -1;
}
if ( value < valueFound )
{
return binarySearch( array, startOffset, pIndex, value );
}
else
{
return binarySearch( array, pIndex, endOffset, value );
}
}*/
}
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