From 32d1d8cad817b954b425a33b4f8cd8655964368f Mon Sep 17 00:00:00 2001
From: Grahame Grieve <grahameg@gmail.ccom>
Date: Tue, 22 Aug 2023 21:46:25 +1000
Subject: [PATCH] Hack utility for tx.fhir.org debugging

---
 .../hl7/fhir/r4/utils/ParametersBuilder.java  | 68 +++++++++++++++++++
 1 file changed, 68 insertions(+)
 create mode 100644 org.hl7.fhir.r4/src/main/java/org/hl7/fhir/r4/utils/ParametersBuilder.java

diff --git a/org.hl7.fhir.r4/src/main/java/org/hl7/fhir/r4/utils/ParametersBuilder.java b/org.hl7.fhir.r4/src/main/java/org/hl7/fhir/r4/utils/ParametersBuilder.java
new file mode 100644
index 000000000..c209391ee
--- /dev/null
+++ b/org.hl7.fhir.r4/src/main/java/org/hl7/fhir/r4/utils/ParametersBuilder.java
@@ -0,0 +1,68 @@
+package org.hl7.fhir.r4.utils;
+
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.FileNotFoundException;
+import java.io.IOException;
+import java.util.Arrays;
+import java.util.Set;
+import java.util.HashSet;
+
+import org.hl7.fhir.r4.formats.IParser.OutputStyle;
+import org.hl7.fhir.r4.formats.JsonParser;
+import org.hl7.fhir.r4.model.Resource;
+import org.hl7.fhir.r4.model.MetadataResource;
+import org.hl7.fhir.r4.model.Parameters;
+import org.hl7.fhir.utilities.TextFile;
+
+/**
+ * Used to take an overload dump from tx.fhir.org and turn it into a parameters resource
+ * 
+ * @author grahamegrieve
+ *
+ */
+public class ParametersBuilder {
+
+  public static void main(String[] args) throws FileNotFoundException, IOException {
+    new ParametersBuilder(args[0], args[1]).process(args[2]);
+  }
+
+
+
+  private String folder;
+  private String baseId;
+
+  protected ParametersBuilder(String folder, String baseId) {
+    super();
+    this.folder = folder;
+    this.baseId = baseId;
+  }
+
+  private void process(String output) throws FileNotFoundException, IOException {
+    Parameters p = new Parameters();
+    Set<String> ids = new HashSet<>();
+    for (File f : new File(folder).listFiles()) {
+      if (f.getName().startsWith(baseId)) {
+        if (f.getName().startsWith(baseId)) {
+          byte[] cnt = TextFile.fileToBytes(f);
+          cnt = shaveZeros(cnt); // bug in tx.fhir.org
+          MetadataResource r = (MetadataResource) new JsonParser().parse(cnt);
+          if (!ids.contains(r.getUrl()+"|"+r.getVersion())) {
+            ids.add(r.getUrl()+"|"+r.getVersion());
+            p.addParameter().setName("tx-resource").setResource(r);
+          }
+        }
+      }
+    }
+    new JsonParser().setOutputStyle(OutputStyle.PRETTY).compose(new FileOutputStream(output), p);
+  }
+
+  private byte[] shaveZeros(byte[] cnt) {
+    for (int i = 0; i < cnt.length; i++) {
+      if (cnt[i] == 0) {
+        return Arrays.copyOf(cnt, i-1);
+      }
+    }
+    return cnt;
+  }
+}