1 files changed, 36 insertions, 0 deletions
diff --git a/src/main/java/org/zwobble/mammoth/internal/xml/NamespacePrefixes.java b/src/main/java/org/zwobble/mammoth/internal/xml/NamespacePrefixes.java
new file mode 100644
index 0000000..82872bd
--- /dev/null
+++ b/src/main/java/org/zwobble/mammoth/internal/xml/NamespacePrefixes.java
@@ -0,0 +1,36 @@
+package org.zwobble.mammoth.internal.xml;
+
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Optional;
+
+import static org.zwobble.mammoth.internal.util.MammothMaps.lookup;
+
+public class NamespacePrefixes {
+    public static Builder builder() {
+        return new Builder();
+    }
+
+    public static class Builder {
+        private final Map<String, String> uriToPrefix = new HashMap<>();
+
+        public Builder put(String prefix, String uri) {
+            uriToPrefix.put(uri, prefix);
+            return this;
+        }
+        
+        public NamespacePrefixes build() {
+            return new NamespacePrefixes(uriToPrefix);
+        }
+    }
+
+    private final Map<String, String> uriToPrefix;
+
+    public NamespacePrefixes(Map<String, String> uriToPrefix) {
+        this.uriToPrefix = uriToPrefix;
+    }
+
+    public Optional<String> prefixForUri(String uri) {
+        return lookup(uriToPrefix, uri);
+    }
+}