Improved completion processor

[phpeclipse.git] / net.sourceforge.phpeclipse / src / net / sourceforge / phpdt / internal / ui / util / TwoArrayQuickSorter.java

diff --git a/net.sourceforge.phpeclipse/src/net/sourceforge/phpdt/internal/ui/util/TwoArrayQuickSorter.java b/net.sourceforge.phpeclipse/src/net/sourceforge/phpdt/internal/ui/util/TwoArrayQuickSorter.java
new file mode 100644 (file)
index 0000000..49e6e84
--- /dev/null
+++ b/net.sourceforge.phpeclipse/src/net/sourceforge/phpdt/internal/ui/util/TwoArrayQuickSorter.java
@@ -0,0 +1,101 @@
+package net.sourceforge.phpdt.internal.ui.util;
+
+import java.util.Comparator;
+import org.eclipse.jface.util.Assert;
+
+/**
+ * Quick sort to sort key-value pairs. The keys and arrays are specified
+ * in separate arrays.
+ */
+public class TwoArrayQuickSorter {
+       
+       private Comparator fComparator;
+
+       /**
+        * Default comparator.
+        */
+       public static final class StringComparator implements Comparator {
+               private boolean fIgnoreCase;
+       
+               StringComparator(boolean ignoreCase) {
+                       fIgnoreCase= ignoreCase;
+               }
+       
+               public int compare(Object left, Object right) {
+                       return fIgnoreCase
+                               ? ((String) left).compareToIgnoreCase((String) right)
+                               : ((String) left).compareTo((String) right);
+               }
+       }               
+
+       /**
+        * Creates a sorter with default string comparator.
+        * The keys are assumed to be strings.
+        * @param ignoreCase specifies whether sorting is case sensitive or not.
+        */                             
+       public TwoArrayQuickSorter(boolean ignoreCase) {
+               fComparator= new StringComparator(ignoreCase);
+       }
+
+       /**
+        * Creates a sorter with a comparator.
+        * @param comparator the comparator to order the elements. The comparator must not be <code>null</code>.
+        */
+       public TwoArrayQuickSorter(Comparator comparator) {
+               fComparator= comparator;
+       }
+       
+       /**
+        * Sorts keys and values in parallel.
+        * @param keys   the keys to use for sorting.
+        * @param values the values associated with the keys.
+        */
+       public void sort(Object[] keys, Object[] values) {
+               if ((keys == null) || (values == null)) {
+                       Assert.isTrue(false, "Either keys or values in null"); //$NON-NLS-1$
+                       return;
+               }
+
+               if (keys.length <= 1)
+                       return;
+                       
+               internalSort(keys, values, 0, keys.length - 1); 
+       }
+
+       private void internalSort(Object[] keys, Object[] values, int left, int right) {
+               int original_left= left;
+               int original_right= right;
+               
+               Object mid= keys[(left + right) / 2]; 
+               do { 
+                       while (fComparator.compare(keys[left], mid) < 0)
+                               left++; 
+
+                       while (fComparator.compare(mid, keys[right]) < 0)
+                               right--; 
+
+                       if (left <= right) {
+                               swap(keys, left, right);
+                               swap(values, left, right);
+                               left++; 
+                               right--; 
+                       } 
+               } while (left <= right);
+               
+               if (original_left < right)
+                       internalSort(keys , values, original_left, right); 
+
+               if (left < original_right)
+                       internalSort(keys, values, left, original_right); 
+       }
+
+    /*
+     * Swaps x[a] with x[b].
+     */     
+    private static final void swap(Object x[], int a, int b) {
+               Object t = x[a];
+               x[a] = x[b];
+               x[b] = t;
+    }
+    
+}
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