Start integrating GCR and JCR (not yet working)

[lgpl/argeo-commons.git] / org.argeo.api / src / org / argeo / api / gcr / ContentUtils.java

diff --git a/org.argeo.api/src/org/argeo/api/gcr/ContentUtils.java b/org.argeo.api/src/org/argeo/api/gcr/ContentUtils.java
new file mode 100644 (file)
index 0000000..285669c
--- /dev/null
+++ b/org.argeo.api/src/org/argeo/api/gcr/ContentUtils.java
@@ -0,0 +1,75 @@
+package org.argeo.api.gcr;
+
+import java.io.PrintStream;
+import java.net.URI;
+import java.net.URISyntaxException;
+import java.util.Arrays;
+import java.util.Base64;
+import java.util.List;
+import java.util.function.BiConsumer;
+
+public class ContentUtils {
+       public static void traverse(Content content, BiConsumer<Content, Integer> doIt) {
+               traverse(content, doIt, 0);
+       }
+
+       public static void traverse(Content content, BiConsumer<Content, Integer> doIt, int currentDepth) {
+               doIt.accept(content, currentDepth);
+               int nextDepth = currentDepth + 1;
+               for (Content child : content) {
+                       traverse(child, doIt, nextDepth);
+               }
+       }
+
+       public static void print(Content content, PrintStream out, int depth, boolean printText) {
+               StringBuilder sb = new StringBuilder();
+               for (int i = 0; i < depth; i++) {
+                       sb.append("  ");
+               }
+               String prefix = sb.toString();
+               out.println(prefix + content.getName());
+               for (String key : content.keySet()) {
+                       out.println(prefix + " " + key + "=" + content.get(key));
+               }
+               if (printText) {
+                       if (content.hasText()) {
+                               out.println("<![CDATA[" + content.getText().trim() + "]]>");
+                       }
+               }
+       }
+
+       public static URI bytesToDataURI(byte[] arr) {
+               String base64Str = Base64.getEncoder().encodeToString(arr);
+               try {
+                       final String PREFIX = "data:application/octet-stream;base64,";
+                       return new URI(PREFIX + base64Str);
+               } catch (URISyntaxException e) {
+                       throw new IllegalStateException("Cannot serialize bytes a Base64 data URI", e);
+               }
+
+       }
+
+       public static byte[] bytesFromDataURI(URI uri) {
+               if (!"data".equals(uri.getScheme()))
+                       throw new IllegalArgumentException("URI must have 'data' as a scheme");
+               String schemeSpecificPart = uri.getSchemeSpecificPart();
+               int commaIndex = schemeSpecificPart.indexOf(',');
+               String prefix = schemeSpecificPart.substring(0, commaIndex);
+               List<String> info = Arrays.asList(prefix.split(";"));
+               if (!info.contains("base64"))
+                       throw new IllegalArgumentException("URI must specify base64");
+
+               String base64Str = uri.toString().substring(commaIndex);
+               return Base64.getDecoder().decode(base64Str);
+
+       }
+
+       public static <T> boolean isString(T t) {
+               return t instanceof String;
+       }
+
+       /** Singleton. */
+       private ContentUtils() {
+
+       }
+}