X-Git-Url: http://g0dil.de/git?a=blobdiff_plain;f=src%2Fmain%2Fjava%2Fde%2Fj32%2Futil%2FFilteredIterator.java;fp=src%2Fmain%2Fjava%2Fde%2Fj32%2Futil%2FFilteredIterator.java;h=585a537967a1821ebceaf3f1c4ec1c770dd8e8dd;hb=4c31953ffe274db62393de67740de5df70b06d33;hp=0000000000000000000000000000000000000000;hpb=5ac05364dc652686046f01849b810da6ffef1192;p=jpim.git

diff --git a/src/main/java/de/j32/util/FilteredIterator.java b/src/main/java/de/j32/util/FilteredIterator.java
new file mode 100644
index 0000000..585a537
--- /dev/null
+++ b/src/main/java/de/j32/util/FilteredIterator.java
@@ -0,0 +1,50 @@
+package de.j32.util;
+
+import java.util.Iterator;
+import java.util.NoSuchElementException;
+
+public class FilteredIterator<E> implements Iterator<E>
+{
+    Iterator<E> base_;
+    Filter<E> filter_;
+    E next_;
+    boolean hasNext_ = true;
+
+    public FilteredIterator(Iterator<E> base, Filter<E> filter)
+    {
+        base_ = base;
+        filter_ = filter;
+        advance();
+    }
+
+    public E next()
+    {
+        if (hasNext_) {
+            E rv = next_;
+            advance();
+            return rv;
+        }
+        else throw new NoSuchElementException();
+    }
+
+    public boolean hasNext()
+    {
+        return hasNext_;
+    }
+
+    public void remove()
+    {
+        throw new UnsupportedOperationException();
+    }
+
+    void advance()
+    {
+        while (base_.hasNext()) {
+            next_ = base_.next();
+            if (filter_.match(next_)) return;
+        }
+        hasNext_ = false;
+        next_ = null;
+    }
+
+}