Deobfuscate stacktraces in log messages, crash reports, and etc.

paper-server/src/main/java/io/papermc/paper/util/StringPool.java

@@ -0,0 +1,34 @@
+package io.papermc.paper.util;
+
+import java.util.HashMap;
+import java.util.Map;
+import java.util.function.Function;
+import org.checkerframework.checker.nullness.qual.NonNull;
+import org.checkerframework.framework.qual.DefaultQualifier;
+
+/**
+ * De-duplicates {@link String} instances without using {@link String#intern()}.
+ *
+ * <p>Interning may not be desired as we may want to use the heap for our pool,
+ * so it can be garbage collected as normal, etc.</p>
+ *
+ * <p>Additionally, interning can be slow due to the potentially large size of the
+ * pool (as it is shared for the entire JVM), and because most JVMs implement
+ * it using JNI.</p>
+ */
+@DefaultQualifier(NonNull.class)
+public final class StringPool {
+    private final Map<String, String> pool;
+
+    public StringPool() {
+        this(new HashMap<>());
+    }
+
+    public StringPool(final Map<String, String> map) {
+        this.pool = map;
+    }
+
+    public String string(final String string) {
+        return this.pool.computeIfAbsent(string, Function.identity());
+    }
+}