Fix for #1543: link the source method for method-based property proposal

Author: eric-milles

ide/org.codehaus.groovy.eclipse.codeassist/src/org/codehaus/groovy/eclipse/codeassist/creators/AbstractProposalCreator.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2009-2023 the original author or authors.
+ * Copyright 2009-2024 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -71,7 +71,9 @@ protected static FieldNode createMockField(final MethodNode method) {
 
         FieldNode fieldNode = new FieldNode(fieldName, fieldModifiers, fieldType, method.getDeclaringClass(), null);
         fieldNode.setDeclaringClass(method.getDeclaringClass());
+        fieldNode.setNodeMetaData("groovy.method", method);
         fieldNode.setSourcePosition(method);
+        fieldNode.setSynthetic(true);
         return fieldNode;
     }
 

ide/org.codehaus.groovy.eclipse.codeassist/src/org/codehaus/groovy/eclipse/codeassist/proposals/GroovyFieldProposal.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2009-2023 the original author or authors.
+ * Copyright 2009-2024 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -17,6 +17,7 @@
 
 import org.codehaus.groovy.ast.AnnotatedNode;
 import org.codehaus.groovy.ast.FieldNode;
+import org.codehaus.groovy.ast.MethodNode;
 import org.codehaus.groovy.eclipse.codeassist.ProposalUtils;
 import org.codehaus.groovy.eclipse.codeassist.completions.GroovyJavaFieldCompletionProposal;
 import org.codehaus.groovy.eclipse.codeassist.processors.GroovyCompletionProposal;
@@ -31,6 +32,9 @@
 import org.eclipse.jdt.groovy.search.VariableScope;
 import org.eclipse.jdt.internal.codeassist.InternalCompletionProposal;
 import org.eclipse.jdt.internal.codeassist.impl.AssistOptions;
+import org.eclipse.jdt.internal.ui.text.java.AbstractJavaCompletionProposal;
+import org.eclipse.jdt.internal.ui.text.java.MemberProposalInfo;
+import org.eclipse.jdt.internal.ui.text.java.ProposalInfo;
 import org.eclipse.jdt.ui.text.java.IJavaCompletionProposal;
 import org.eclipse.jdt.ui.text.java.JavaContentAssistInvocationContext;
 import org.eclipse.jface.viewers.StyledString;
@@ -105,7 +109,24 @@ public IJavaCompletionProposal createJavaProposal(ContentAssistContext context,
             proposal.setRequiredProposals(new CompletionProposal[] {importProposal});
         }
 
-        return new GroovyJavaFieldCompletionProposal(proposal, createDisplayString(field), javaContext);
+        var javaProposal = new GroovyJavaFieldCompletionProposal(proposal, createDisplayString(field), javaContext);
+        var groovyMethod = field.<MethodNode>getNodeMetaData("groovy.method");
+        if (groovyMethod != null) {
+            try {
+                var type = javaContext.getProject().findType(groovyMethod.getDeclaringClass().getName());
+                if (type != null) {
+                    var method = type.getMethod(groovyMethod.getName(), GroovyUtils.getParameterTypeSignatures(groovyMethod, true));
+                    if (method != null && method.exists()) {
+                        ProposalInfo proposalInfo = ReflectionUtils.executePrivateMethod(AbstractJavaCompletionProposal.class, "getProposalInfo", javaProposal);
+                        ReflectionUtils.throwableSetPrivateField(MemberProposalInfo.class, "fJavaElementResolved", proposalInfo, Boolean.TRUE);
+                        ReflectionUtils.throwableSetPrivateField(ProposalInfo.class, "fElement", proposalInfo, method);
+                    }
+                }
+            } catch (Exception e) {
+                e.printStackTrace();
+            }
+        }
+        return javaProposal;
     }
 
     protected StyledString createDisplayString(FieldNode field) {