Completion using arbitrary langauge servers in Java text blocks

org.eclipse.lsp4e.jdt/META-INF/MANIFEST.MF

@@ -2,8 +2,9 @@ Manifest-Version: 1.0
 Bundle-ManifestVersion: 2
 Bundle-Name: JDT Integration for LSP4E
 Bundle-SymbolicName: org.eclipse.lsp4e.jdt;singleton:=true
-Bundle-Version: 0.14.2.qualifier
-Export-Package: org.eclipse.lsp4e.jdt
+Bundle-Version: 0.14.3.qualifier
+Export-Package: org.eclipse.lsp4e.jdt,
+  org.eclipse.lsp4e.jdt.internal;x-friends:=org.eclipse.lsp4e.test
 Automatic-Module-Name: org.eclipse.lsp4e.jdt
 Bundle-Activator: org.eclipse.lsp4e.jdt.LanguageServerJdtPlugin
 Bundle-ActivationPolicy: lazy

org.eclipse.lsp4e.jdt/plugin.properties

@@ -11,4 +11,5 @@
 ###############################################################################
 
 lsCompletionComputer_name=Language Server Proposals
+lsTextBlockCompletionComputer_name=Language Server Proposals in Java Text Blocks
 languageservers.jdt.preferences.page=Java

org.eclipse.lsp4e.jdt/plugin.xml

@@ -1,6 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <?eclipse version="3.4"?>
 <plugin>
+   <extension-point id="org.eclipse.lsp4e.jdt.LSJavaTextBlockLanguageDetector" name="LSJavaTextBlockLanguageDetector" schema="schema/org.eclipse.lsp4e.jdt.LSJavaTextBlockLanguageDetector.exsd"/>
 
    <extension
          id="ls-based-java-completion-computer"
@@ -14,6 +15,18 @@
             requiresUIThread="false">
       </javaCompletionProposalComputer>
    </extension>
+   <extension
+         id="ls-based-java-text-block-completion-computer"
+         name="%lsTextBlockCompletionComputer_name"
+         point="org.eclipse.jdt.ui.javaCompletionProposalComputer">
+      <javaCompletionProposalComputer
+            activate="true"
+            categoryId="org.eclipse.lsp4e.jdt.ls-based-java-text-block-completion-computer"
+            class="org.eclipse.lsp4e.jdt.internal.JavaTextBlockProposalComputer"
+            needsSortingAfterFiltering="false"
+            requiresUIThread="false">
+      </javaCompletionProposalComputer>
+   </extension>
 
    <extension
          id="ls-based-java-hover-provider"

org.eclipse.lsp4e.jdt/schema/org.eclipse.lsp4e.jdt.LSJavaTextBlockLanguageDetector.exsd

@@ -0,0 +1,122 @@
+<?xml version='1.0' encoding='UTF-8'?>
+<!-- Schema file written by PDE -->
+<schema targetNamespace="org.eclipse.lsp4e.jdt" xmlns="http://www.w3.org/2001/XMLSchema">
+<annotation>
+      <appinfo>
+         <meta.schema plugin="org.eclipse.lsp4e.jdt" id="org.eclipse.lsp4e.jdt.LSJavaTextBlockLanguageDetector" name="LSJavaTextBlockLanguageDetector"/>
+      </appinfo>
+      <documentation>
+         This extension point allows customizing which language servers should be used for language server functionality within Java text blocks.
+      </documentation>
+   </annotation>
+
+   <element name="extension">
+      <annotation>
+         <appinfo>
+            <meta.element />
+         </appinfo>
+      </annotation>
+      <complexType>
+         <choice minOccurs="1" maxOccurs="unbounded">
+            <element ref="detector"/>
+         </choice>
+         <attribute name="point" type="string" use="required">
+            <annotation>
+               <documentation>
+
+               </documentation>
+            </annotation>
+         </attribute>
+         <attribute name="id" type="string">
+            <annotation>
+               <documentation>
+
+               </documentation>
+            </annotation>
+         </attribute>
+         <attribute name="name" type="string">
+            <annotation>
+               <documentation>
+
+               </documentation>
+               <appinfo>
+                  <meta.attribute translatable="true"/>
+               </appinfo>
+            </annotation>
+         </attribute>
+      </complexType>
+   </element>
+
+   <element name="detector">
+      <complexType>
+         <attribute name="class" type="string" use="required">
+            <annotation>
+               <documentation>
+                  The class deciding on the language server that should be used for language server functionality in Java text blocks.
+               </documentation>
+               <appinfo>
+                  <meta.attribute kind="java" basedOn=":org.eclipse.lsp4e.jdt.LSJavaTextBlockLanguageDetector"/>
+               </appinfo>
+            </annotation>
+         </attribute>
+      </complexType>
+   </element>
+
+   <annotation>
+      <appinfo>
+         <meta.section type="since"/>
+      </appinfo>
+      <documentation>
+         0.14.3
+      </documentation>
+   </annotation>
+
+   <annotation>
+      <appinfo>
+         <meta.section type="examples"/>
+      </appinfo>
+      <documentation>
+         The following extension point can be used with a language server that expects SQL files:
+
+&lt;pre&gt;
+&lt;extension
+    point=&quot;org.eclipse.lsp4e.jdt.LSJavaTextBlockLanguageDetector&quot;
+    class=&quot;com.example.AlwaysSQLLanguageDetector&quot;&gt;
+&lt;/extension&gt;
+&lt;/pre&gt;
+
+The &lt;code&gt;AlwaysSQLLanguageDetector&lt;/code&gt; class could be written as follows:
+
+&lt;pre&gt;
+public class AlwaysSQLLanguageDetector implements LSJavaTextBlockLanguageDetector {
+	@Override
+	public URI createURIForTextBlock(ICompilationUnit compilationUnit, ITextViewer textViewer, IRegion textBlockRegion) {
+		return URI.create(&quot;javatextblock:///test.sql&quot;);
+	}
+}
+&lt;/pre&gt;
+
+This will make sure that language servers expecting that URI are taken into account for that text block.
+      </documentation>
+   </annotation>
+
+   <annotation>
+      <appinfo>
+         <meta.section type="apiinfo"/>
+      </appinfo>
+      <documentation>
+         [Enter API information here.]
+      </documentation>
+   </annotation>
+
+   <annotation>
+      <appinfo>
+         <meta.section type="implementation"/>
+      </appinfo>
+      <documentation>
+         [Enter information about supplied implementation of this extension point.]
+      </documentation>
+   </annotation>
+
+
+</schema>

org.eclipse.lsp4e.jdt/src/org/eclipse/lsp4e/jdt/LSJavaCompletionProposalComputer.java

@@ -25,6 +25,7 @@
 import org.eclipse.jface.text.contentassist.ICompletionProposal;
 import org.eclipse.jface.text.contentassist.IContextInformation;
 import org.eclipse.lsp4e.LanguageServerPlugin;
+import org.eclipse.lsp4e.jdt.internal.LSJavaProposal;
 import org.eclipse.lsp4e.operations.completion.LSCompletionProposal;
 import org.eclipse.lsp4e.operations.completion.LSContentAssistProcessor;
 

org.eclipse.lsp4e.jdt/src/org/eclipse/lsp4e/jdt/LSJavaTextBlockLanguageDetector.java

@@ -0,0 +1,44 @@
+/*******************************************************************************
+ * Copyright (c) 2026 Daniel Schmid and others.
+ * This program and the accompanying materials are made
+ * available under the terms of the Eclipse Public License 2.0
+ * which is available at https://www.eclipse.org/legal/epl-2.0/
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ *
+ * Contributors:
+ *  - Daniel Schmid - Initial API and implementation
+ *******************************************************************************/
+package org.eclipse.lsp4e.jdt;
+
+import java.net.URI;
+
+import org.eclipse.jdt.annotation.Nullable;
+import org.eclipse.jdt.core.ICompilationUnit;
+import org.eclipse.jface.text.IRegion;
+import org.eclipse.jface.text.ITextViewer;
+
+/**
+ * Allows plugins providing custom logic for which language servers should be
+ * used within Java text blocks.
+ */
+public interface LSJavaTextBlockLanguageDetector {
+	/**
+	 * Creates a {@link URI} indicating the language server that should be used for
+	 * a Java text block.
+	 *
+	 * @param compilationUnit
+	 *                            The compilation unit corresponding to the Java
+	 *                            file.
+	 * @param textViewer
+	 *                            The text viewer the Java file is opened in.
+	 * @param textBlockRegion
+	 *                            The source code region of the text block within
+	 *                            the Java file.
+	 * @return A {@link URI} where documents corresponding to that {@link URI} are
+	 *         recognized by that language server. This {@link URI} does not need to
+	 *         be resolvable.
+	 */
+	@Nullable
+	URI createURIForTextBlock(ICompilationUnit compilationUnit, ITextViewer textViewer, IRegion textBlockRegion);
+}

org.eclipse.lsp4e.jdt/src/org/eclipse/lsp4e/jdt/LspJavaQuickAssistProcessor.java

@@ -23,6 +23,7 @@
 import org.eclipse.jface.text.quickassist.IQuickAssistInvocationContext;
 import org.eclipse.jface.text.source.ISourceViewer;
 import org.eclipse.jface.text.source.TextInvocationContext;
+import org.eclipse.lsp4e.jdt.internal.LSJavaProposal;
 import org.eclipse.lsp4e.operations.codeactions.LSPCodeActionQuickAssistProcessor;
 import org.eclipse.lsp4e.operations.completion.LSCompletionProposal;