Migrating to Drools.

1 files changed, 81 insertions, 0 deletions

diff --git a/src/main/java/io/trygvis/rules/acme/AcmeIo.java b/src/main/java/io/trygvis/rules/acme/AcmeIo.java
new file mode 100644
index 0000000..67dd4cb
--- /dev/null
+++ b/src/main/java/io/trygvis/rules/acme/AcmeIo.java
@@ -0,0 +1,81 @@
+package io.trygvis.rules.acme;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.dataformat.yaml.YAMLFactory;
+import com.fasterxml.jackson.dataformat.yaml.YAMLGenerator;
+import org.drools.core.common.DefaultFactHandle;
+import org.kie.api.runtime.rule.FactHandle;
+
+import java.io.File;
+import java.io.FileWriter;
+import java.io.IOException;
+import java.util.AbstractMap;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.Comparator;
+import java.util.List;
+import java.util.Map;
+
+public class AcmeIo {
+    private final ObjectMapper mapper;
+
+    public AcmeIo() {
+        var factory = new YAMLFactory();
+        factory.enable(YAMLGenerator.Feature.USE_NATIVE_TYPE_ID);
+        factory.enable(YAMLGenerator.Feature.USE_NATIVE_OBJECT_ID);
+        mapper = new ObjectMapper(factory);
+        mapper.findAndRegisterModules();
+    }
+
+    public List<Object> load(String file) throws IOException {
+        var parser = mapper.getFactory().createParser(new File(file));
+
+        var objects = mapper.readValues(parser, AcmeObject.class).readAll(new ArrayList<>());
+
+        List<Object> items = new ArrayList<>(objects.size());
+        for (AcmeObject object : objects) {
+            try {
+                var type = Class.forName(object.type);
+                var x = mapper.treeToValue(object.data, type);
+                items.add(x);
+            } catch (ClassNotFoundException e) {
+                throw new IOException(e);
+            }
+        }
+
+        return items;
+    }
+
+    public void dump(String s, Collection<FactHandle> factHandles) throws IOException {
+        var out = new File("out");
+
+        if (!out.isDirectory()) {
+            if (!out.mkdirs()) {
+                throw new IOException("Could not create directory: " + out);
+            }
+        }
+
+        List<Map.Entry<String, Object>> facts = new ArrayList<>(factHandles.size());
+        for (var handle : factHandles) {
+            if (handle instanceof DefaultFactHandle h) {
+                facts.add(new AbstractMap.SimpleImmutableEntry<>(
+                        h.getObjectClassName(),
+                        h.getObject()));
+            }
+        }
+
+        facts.sort(Map.Entry.comparingByKey());
+
+        var factory = mapper.getFactory();
+        try (var writer = new FileWriter(new File(out, s + ".yaml"));
+             var g = factory.createGenerator(writer)) {
+            for (Map.Entry<String, Object> fact : facts) {
+                g.writeObject(new AcmeObject(
+                        fact.getKey(),
+                        mapper.valueToTree(fact.getValue())
+                ));
+            }
+        }
+    }
+}