X-Git-Url: https://gerrit.simantics.org/r/gitweb?a=blobdiff_plain;f=bundles%2Forg.simantics.db.impl%2Fsrc%2Forg%2Fsimantics%2Fdb%2Fimpl%2Fgraph%2FRandomAccessSubList.java;fp=bundles%2Forg.simantics.db.impl%2Fsrc%2Forg%2Fsimantics%2Fdb%2Fimpl%2Fgraph%2FRandomAccessSubList.java;h=05251c1230c38bbeab3ebb9e0cb48059f3e25c0f;hb=969bd23cab98a79ca9101af33334000879fb60c5;hp=0000000000000000000000000000000000000000;hpb=866dba5cd5a3929bbeae85991796acb212338a08;p=simantics%2Fplatform.git

diff --git a/bundles/org.simantics.db.impl/src/org/simantics/db/impl/graph/RandomAccessSubList.java b/bundles/org.simantics.db.impl/src/org/simantics/db/impl/graph/RandomAccessSubList.java
new file mode 100644
index 000000000..05251c123
--- /dev/null
+++ b/bundles/org.simantics.db.impl/src/org/simantics/db/impl/graph/RandomAccessSubList.java
@@ -0,0 +1,28 @@
+package org.simantics.db.impl.graph;
+
+import java.util.AbstractList;
+import java.util.List;
+
+public class RandomAccessSubList<T> extends AbstractList<T> {
+    private final List<T> baseList;
+    private final int fromIndex;
+    private final int length;
+    
+    public RandomAccessSubList(List<T> baseList, int fromIndex, int length) {
+        this.baseList = baseList;
+        this.fromIndex = fromIndex;
+        this.length = length;
+    }
+
+    @Override
+    public T get(int index) {
+        if(index < 0 || index > length)
+            throw new IndexOutOfBoundsException();
+        return baseList.get(index+fromIndex);
+    }
+
+    @Override
+    public int size() {
+        return length;
+    }
+}