Add instance tags

2 files changed, 113 insertions, 0 deletions

diff --git a/config-provisioning/src/main/java/com/yahoo/config/provision/Tags.java b/config-provisioning/src/main/java/com/yahoo/config/provision/Tags.java
new file mode 100644
index 00000000000..007db2fd171
--- /dev/null
+++ b/config-provisioning/src/main/java/com/yahoo/config/provision/Tags.java
@@ -0,0 +1,61 @@
+// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+package com.yahoo.config.provision;
+
+import java.util.Set;
+
+/**
+ * A deployment may have a list of tags associated with it. Config files may have variants for these tags similar
+ * to how they may have variants for instance and zone.
+ *
+ * @author bratseth
+ */
+public class Tags {
+
+    private final Set<String> tags;
+
+    public Tags(Set<String> tags) {
+        this.tags = Set.copyOf(tags);
+    }
+
+    public boolean contains(String tag) {
+        return tags.contains(tag);
+    }
+
+    public boolean intersects(Tags other) {
+        return this.tags.stream().anyMatch(other::contains);
+    }
+
+    public boolean isEmpty() { return tags.isEmpty(); }
+
+    public boolean containsAll(Tags other) { return tags.containsAll(other.tags); }
+
+    /** Returns this as a space-separated string which can be used to recreate this by calling fromString(). */
+    public String asString() { return String.join(" ", tags); }
+
+    @Override
+    public String toString() {
+        return asString();
+    }
+
+    @Override
+    public boolean equals(Object other) {
+        if (other == this) return true;
+        if (other == null || other.getClass() != getClass()) return false;
+        return tags.equals(((Tags)other).tags);
+    }
+
+    @Override
+    public int hashCode() {
+        return tags.hashCode();
+    }
+
+    public static Tags empty() { return new Tags(Set.of()); }
+
+    /**
+     * Creates this from a space-separated string or null. */
+    public static Tags fromString(String tagsString) {
+        if (tagsString == null || tagsString.isBlank()) return empty();
+        return new Tags(Set.of(tagsString.trim().split(" ")));
+    }
+
+}
diff --git a/config-provisioning/src/test/java/com/yahoo/config/provision/TagsTest.java b/config-provisioning/src/test/java/com/yahoo/config/provision/TagsTest.java
new file mode 100644
index 00000000000..1f2b2737619
--- /dev/null
+++ b/config-provisioning/src/test/java/com/yahoo/config/provision/TagsTest.java
@@ -0,0 +1,52 @@
+// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+package com.yahoo.config.provision;
+
+import org.junit.jupiter.api.Test;
+
+import java.util.Set;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+/**
+ * @author bratseth
+ */
+public class TagsTest {
+
+    @Test
+    public void testEmpty() {
+        assertEquals(Tags.empty(), Tags.fromString(null));
+        assertEquals(Tags.empty(), Tags.fromString(""));
+        assertEquals(Tags.empty(), Tags.fromString(" "));
+    }
+
+    @Test
+    public void testSerialization() {
+        Tags tags = new Tags(Set.of("a", "tag2", "3"));
+        assertEquals(tags, Tags.fromString(tags.toString())); // Required by automatic serialization
+        assertEquals(tags, Tags.fromString(tags.asString())); // Required by automatic serialization
+    }
+
+    @Test
+    public void testContains() {
+        Tags tags = new Tags(Set.of("a", "tag2", "3"));
+        assertTrue(tags.contains("a"));
+        assertTrue(tags.contains("tag2"));
+        assertTrue(tags.contains("3"));
+        assertFalse(tags.contains("other"));
+
+        Tags subTags = new Tags(Set.of("a", "3"));
+        assertTrue(tags.containsAll(subTags));
+        assertFalse(subTags.containsAll(tags));
+    }
+
+    @Test
+    public void testIntersects() {
+        Tags tags1 = new Tags(Set.of("a", "tag2", "3"));
+        Tags tags2 = new Tags(Set.of("a", "tag3"));
+        assertTrue(tags1.intersects(tags2));
+        assertTrue(tags2.intersects(tags1));
+    }
+
+}