1 files changed, 79 insertions, 0 deletions
diff --git a/config-lib/src/main/java/com/yahoo/config/LeafNodeVector.java b/config-lib/src/main/java/com/yahoo/config/LeafNodeVector.java
new file mode 100644
index 00000000000..59e070f1d56
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+++ b/config-lib/src/main/java/com/yahoo/config/LeafNodeVector.java
@@ -0,0 +1,79 @@
+// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+package com.yahoo.config;
+
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.List;
+
+/**
+ * A vector of leaf nodes.
+ *
+ * @author gjoranv
+ * @since 5.1.4
+ */
+public class LeafNodeVector<REAL, NODE extends LeafNode<REAL>> extends NodeVector<NODE> {
+
+    NODE defaultNode;
+
+    /**
+     * Creates a new vector with the given default node.
+     */
+    // TODO: remove this ctor when the library uses reflection via builders, and resizing won't be necessary
+    public LeafNodeVector(NODE defaultNode) {
+        assert (defaultNode != null) : "The default node cannot be null";
+
+        this.defaultNode = defaultNode;
+        if (createNew() == null) {
+            throw new NullPointerException("Unable to duplicate the default node.");
+        }
+    }
+
+    // TODO: take class instead of default node when the library uses reflection via builders
+    public LeafNodeVector(List<REAL> values, NODE defaultNode) {
+        this(defaultNode);
+        for (REAL value : values) {
+            NODE node = createNew();
+            node.value = value;
+            vector.add(node);
+        }
+    }
+
+    /**
+     * Creates a new Node by cloning the default node.
+     */
+    @SuppressWarnings("unchecked")
+    protected NODE createNew() {
+        return (NODE) (defaultNode).clone();
+    }
+
+    // TODO: create unmodifiable list in ctor when the library uses reflection via builders
+    @SuppressWarnings("unchecked")
+    public List<REAL> asList() {
+        List<REAL> ret = new ArrayList<REAL>();
+        for(NODE node : vector) {
+            ret.add(node.value());
+        }
+        return Collections.unmodifiableList(ret);
+    }
+
+    // TODO: Try to eliminate the need for this method when we have moved FileAcquirer to the config library
+    // It is needed now because the builder has a list of String, while REAL=FileReference.
+    public static LeafNodeVector<FileReference, FileNode> createFileNodeVector(Collection<String> values) {
+        List<FileReference> fileReferences = new ArrayList<FileReference>();
+         for (String s : values)
+             fileReferences.add(new FileReference(ReferenceNode.stripQuotes(s)));
+
+        return new LeafNodeVector<FileReference, FileNode>(fileReferences, new FileNode());
+    }
+
+    public static LeafNodeVector<Path, PathNode> createPathNodeVector(Collection<FileReference> values) {
+        List<Path> paths = new ArrayList<>();
+        for (FileReference fileReference : values)
+            paths.add(Paths.get(fileReference.value()));
+
+        return new LeafNodeVector<Path, PathNode>(paths, new PathNode());
+    }
+}