1 files changed, 86 insertions, 0 deletions
diff --git a/node-admin/src/main/java/com/yahoo/vespa/hosted/node/admin/task/util/template/Form.java b/node-admin/src/main/java/com/yahoo/vespa/hosted/node/admin/task/util/template/Form.java
new file mode 100644
index 00000000000..6b38835e24f
--- /dev/null
+++ b/node-admin/src/main/java/com/yahoo/vespa/hosted/node/admin/task/util/template/Form.java
@@ -0,0 +1,86 @@
+// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+package com.yahoo.vespa.hosted.node.admin.task.util.template;
+
+import com.yahoo.vespa.hosted.node.admin.task.util.text.CursorRange;
+
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Optional;
+
+/**
+ * A form is an instance of a template to be filled, e.g. values set for variable sections, etc.
+ *
+ * @see Template
+ * @author hakonhall
+ */
+public class Form {
+    private Form parent = null;
+    private final CursorRange range;
+    private final List<Section> sections;
+
+    private final Map<String, String> values = new HashMap<>();
+    private final Map<String, ListSection> lists;
+
+    Form(CursorRange range, List<Section> sections, Map<String, ListSection> lists) {
+        this.range = new CursorRange(range);
+        this.sections = List.copyOf(sections);
+        this.lists = Map.copyOf(lists);
+    }
+
+    void setParent(Form parent) { this.parent = parent; }
+
+    /** Set the value of a variable, e.g. %{=color}. */
+    public Form set(String name, String value) {
+        values.put(name, value);
+        return this;
+    }
+
+    /** Set the value of a variable and/or if-condition. */
+    public Form set(String name, boolean value) { return set(name, Boolean.toString(value)); }
+
+    public Form set(String name, int value) { return set(name, Integer.toString(value)); }
+    public Form set(String name, long value) { return set(name, Long.toString(value)); }
+
+    public Form set(String name, String format, String first, String... rest) {
+        var args = new Object[1 + rest.length];
+        args[0] = first;
+        System.arraycopy(rest, 0, args, 1, rest.length);
+        var value = String.format(format, args);
+
+        return set(name, value);
+    }
+
+    /** Add an instance of a list section after any previously added (for the given name)  */
+    public Form add(String name) {
+        var section = lists.get(name);
+        if (section == null) {
+            throw new NoSuchNameTemplateException(range, name);
+        }
+        return section.add();
+    }
+
+    public String render() {
+        var buffer = new StringBuilder((int) (range.length() * 1.2 + 128));
+        appendTo(buffer);
+        return buffer.toString();
+    }
+
+    public void appendTo(StringBuilder buffer) {
+        sections.forEach(section -> section.appendTo(buffer));
+    }
+
+    /** Returns a deep copy of this. No changes to this affects the returned form, and vice versa. */
+    Form copy() {
+        var builder = new FormBuilder(range.start());
+        sections.forEach(section -> section.appendCopyTo(builder.topLevelSectionList()));
+        return builder.build();
+    }
+
+    Optional<String> getVariableValue(String name) {
+        String value = values.get(name);
+        if (value != null) return Optional.of(value);
+        if (parent != null) return parent.getVariableValue(name);
+        return Optional.empty();
+    }
+}