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| package test;
import java.util.Arrays;
import java.util.Comparator;
import java.util.Formatter;
public class CompoundComparator
{
public static void main( String[] args )
{
Animal[] animals = new Animal[]
{
new Animal( "Dog", Color.WHITE, 50, 30 ),
new Animal( "Cat", Color.BLACK, 15, 5 ),
new Animal( "Bird", Color.YELLOW, 5, 1 ),
new Animal( "Horse", Color.BROWN, 120, 200 ),
new Animal( "Fish", Color.GRAY, 20, 2 ),
};
System.out.println( "Tableau original:" );
show( animals );
MultiCriteriaSorter<Animal> sorter = new MultiCriteriaSorter<Animal>( COLUMN_COMPARATORS );
System.out.println( "Tri en fonction du nom:" );
sorter.setMainSortColumn( 0 );
sorter.sort( animals );
show( animals );
System.out.println( "Tri en fonction de la couleur:" );
sorter.setMainSortColumn( 1 );
sorter.sort( animals );
show( animals );
System.out.println( "Tri en fonction de la hauteur:" );
sorter.setMainSortColumn( 2 );
sorter.sort( animals );
show( animals );
System.out.println( "Tri en fonction du poids:" );
sorter.setMainSortColumn( 3 );
sorter.sort( animals );
show( animals );
}
private static void show( Animal[] animals )
{
System.out.println( "=====================================================" );
System.out.println( "| NAME | COLOR | HEIGHT | WEIGHT |" );
System.out.println( "|---------------------------------------------------|" );
for ( Animal animal : animals )
System.out.println( animal.toString() );
System.out.println( "=====================================================" );
}
public static enum Color { BLACK, BROWN, GRAY, WHITE, YELLOW }
public static class Animal
{
protected String name;
protected Color color;
protected int height;
protected int weight;
public Animal( String name, Color color, int height, int weight )
{
super();
this.name = name;
this.color = color;
this.height = height;
this.weight = weight;
}
public String getName() { return name; }
public void setName( String newName ) { name = newName; }
public Color getColor() { return color; }
public void setColor( Color newColor ) { color = newColor; }
public int getHeight() { return height; }
public void setHeight( int newHeight ) { height = newHeight; }
public int getWeight() { return weight; }
public void setWeight( int newWeight ) { weight = newWeight; }
public String toString()
{
StringBuilder builder = new StringBuilder( 56 );
Formatter fmt = new Formatter( builder );
fmt.format( "| %10s | %10s | %10d | %10d |", name, color.name(), height, weight );
return builder.toString();
}
}
public static final Comparator<Animal> NAME_COMPARATOR = new NameComparator();
public static class NameComparator implements Comparator<Animal>
{
public int compare( Animal leftAnimal, Animal rightAnimal )
{
return leftAnimal.getName().compareTo( rightAnimal.getName() );
}
}
public static final Comparator<Animal> COLOR_COMPARATOR = new ColorComparator();
public static class ColorComparator implements Comparator<Animal>
{
public int compare( Animal leftAnimal, Animal rightAnimal )
{
return leftAnimal.getColor().compareTo( rightAnimal.getColor() );
}
}
public static final Comparator<Animal> HEIGHT_COMPARATOR = new HeightComparator();
public static class HeightComparator implements Comparator<Animal>
{
public int compare( Animal leftAnimal, Animal rightAnimal )
{
int leftHeight = leftAnimal.getHeight();
int rightHeight = rightAnimal.getHeight();
return leftHeight < rightHeight ? -1 : (leftHeight == rightHeight ? 0 : +1);
}
}
public static final Comparator<Animal> WEIGHT_COMPARATOR = new WeightComparator();
public static class WeightComparator implements Comparator<Animal>
{
public int compare( Animal leftAnimal, Animal rightAnimal )
{
int leftWeight = leftAnimal.getWeight();
int rightWeight = rightAnimal.getWeight();
return leftWeight < rightWeight ? -1 : (leftWeight == rightWeight ? 0 : +1);
}
}
@SuppressWarnings("unchecked")
public static final Comparator<Animal>[] COLUMN_COMPARATORS =
new Comparator[] { NAME_COMPARATOR, COLOR_COMPARATOR, HEIGHT_COMPARATOR, WEIGHT_COMPARATOR };
public static class MultiCriteriaSorter<T>
{
protected Comparator<T>[] comparators;
protected int[] compareOrder;
protected MultiCriteriaComparator multiComparator;
public MultiCriteriaSorter( Comparator<T>[] columnComparators )
{
super();
comparators = columnComparators;
compareOrder = new int[columnComparators.length];
for ( int i = 0; i < columnComparators.length; i++ )
compareOrder[i] = i;
multiComparator = new MultiCriteriaComparator();
}
public void setMainSortColumn( int columnNumber )
{
for ( int i = 0; i < compareOrder.length; i++ )
{
if ( compareOrder[i] == columnNumber )
{
if ( i == 0 )
return;
System.arraycopy( compareOrder, 0, compareOrder, 1, i );
compareOrder[0] = columnNumber;
}
}
}
public void sort( T[] array ) { Arrays.sort( array, multiComparator ); }
protected class MultiCriteriaComparator implements Comparator<T>
{
public int compare( T left, T right )
{
for ( int comparatorIndex : compareOrder )
{
int compareResult = comparators[comparatorIndex].compare( left, right );
if ( compareResult != 0 )
return compareResult;
}
return 0;
}
}
}
} |
