Introduce CMS JSon

[lgpl/argeo-commons.git] / org.argeo.cms.lib.json / src / org / argeo / cms / acr / json / AcrJsonUtils.java

diff --git a/org.argeo.cms.lib.json/src/org/argeo/cms/acr/json/AcrJsonUtils.java b/org.argeo.cms.lib.json/src/org/argeo/cms/acr/json/AcrJsonUtils.java
new file mode 100644 (file)
index 0000000..f288c60
--- /dev/null
+++ b/org.argeo.cms.lib.json/src/org/argeo/cms/acr/json/AcrJsonUtils.java
@@ -0,0 +1,43 @@
+package org.argeo.cms.acr.json;
+
+import javax.xml.namespace.QName;
+
+import org.argeo.api.acr.Content;
+import org.argeo.api.acr.NamespaceUtils;
+import org.argeo.api.acr.QNamed;
+
+import jakarta.json.stream.JsonGenerator;
+
+/** Utilities around ACR and the JSON format. */
+public class AcrJsonUtils {
+       public static void writeAttr(JsonGenerator g, Content content, String attr) {
+               writeAttr(g, content, NamespaceUtils.parsePrefixedName(attr));
+       }
+
+       public static void writeAttr(JsonGenerator g, Content content, QNamed attr) {
+               writeAttr(g, content, attr.qName());
+       }
+
+       public static void writeAttr(JsonGenerator g, Content content, QName attr) {
+               // String value = content.attr(attr);
+               Object value = content.get(attr);
+               if (value != null) {
+                       // TODO specify NamespaceContext
+                       String key = NamespaceUtils.toPrefixedName(attr);
+                       if (value instanceof Double v)
+                               g.write(key, v);
+                       else if (value instanceof Long v)
+                               g.write(key, v);
+                       else if (value instanceof Integer v)
+                               g.write(key, v);
+                       else if (value instanceof Boolean v)
+                               g.write(key, v);
+                       else
+                               g.write(key, value.toString());
+               }
+       }
+
+       /** singleton */
+       private AcrJsonUtils() {
+       }
+}