X-Git-Url: https://git.argeo.org/?a=blobdiff_plain;f=org.argeo.api%2Fsrc%2Forg%2Fargeo%2Fapi%2Fgcr%2FContentUtils.java;fp=org.argeo.api%2Fsrc%2Forg%2Fargeo%2Fapi%2Fgcr%2FContentUtils.java;h=285669cb614d03224f0ff7c856a27409083317ab;hb=8767858f1fca02ea7c53ca244f6c1fa745d91ac4;hp=0000000000000000000000000000000000000000;hpb=5a36795f16b1b2a58188db84d6546b501626bda8;p=lgpl%2Fargeo-commons.git

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
index 000000000..285669cb6
--- /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() {
+
+	}
+}