From 35b73a33763ca36f5836f8337bb2f01bbae669bc Mon Sep 17 00:00:00 2001
From: Mathieu Baudier <mbaudier@argeo.org>
Date: Wed, 1 Jan 2020 12:09:11 +0100
Subject: [PATCH] Introduce JCR XSL template

---
 .../argeo/cms/integration/XslTemplate.java    | 55 +++++++++++++++++++
 1 file changed, 55 insertions(+)
 create mode 100644 org.argeo.cms/src/org/argeo/cms/integration/XslTemplate.java

diff --git a/org.argeo.cms/src/org/argeo/cms/integration/XslTemplate.java b/org.argeo.cms/src/org/argeo/cms/integration/XslTemplate.java
new file mode 100644
index 000000000..c9802a2f5
--- /dev/null
+++ b/org.argeo.cms/src/org/argeo/cms/integration/XslTemplate.java
@@ -0,0 +1,55 @@
+package org.argeo.cms.integration;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+
+import javax.jcr.Node;
+import javax.jcr.RepositoryException;
+import javax.xml.transform.Result;
+import javax.xml.transform.Source;
+import javax.xml.transform.Transformer;
+import javax.xml.transform.TransformerConfigurationException;
+import javax.xml.transform.TransformerException;
+import javax.xml.transform.TransformerFactory;
+import javax.xml.transform.TransformerFactoryConfigurationError;
+import javax.xml.transform.stream.StreamResult;
+import javax.xml.transform.stream.StreamSource;
+
+public class XslTemplate {
+	private Transformer transformer;
+
+	public XslTemplate(InputStream in, String systemId) {
+		this(loadTransformer(in, systemId));
+	}
+
+	public XslTemplate(Transformer transformer) {
+		this.transformer = transformer;
+	}
+
+	private static Transformer loadTransformer(InputStream in, String systemId) {
+		try {
+			TransformerFactory tFactory = TransformerFactory.newInstance();
+			StreamSource stylesource = new StreamSource(in, systemId);
+			return tFactory.newTransformer(stylesource);
+		} catch (TransformerConfigurationException | TransformerFactoryConfigurationError e) {
+			throw new IllegalArgumentException("Cannot initialise stylesheet with systemId " + systemId, e);
+		}
+	}
+
+	public synchronized void apply(Node node, OutputStream out) {
+		// TODO use a pool of Transformer instead of synchronized
+		try (ByteArrayOutputStream xml = new ByteArrayOutputStream()) {
+			node.getSession().exportDocumentView(node.getPath(), xml, true, false);
+			try (ByteArrayInputStream xmlIn = new ByteArrayInputStream(xml.toByteArray())) {
+				Source source = new StreamSource(xmlIn);
+				Result results = new StreamResult(out);
+				transformer.transform(source, results);
+			}
+		} catch (IOException | RepositoryException | TransformerException e) {
+			throw new RuntimeException("Cannot process XSL template on " + node, e);
+		}
+	}
+}
-- 
2.30.2