Add 'Introduce Parameter...' code action

Signed-off-by: Snjezana Peco <[email protected]>

org.eclipse.jdt.ls.core/plugin.xml

@@ -140,4 +140,10 @@
 	     	order="2000"
 	     	class="org.eclipse.jdt.ls.core.internal.managers.EclipseBuildSupport" />
    </extension>
+   <extension
+         point="org.eclipse.ltk.core.refactoring.refactoringContributions">
+      <contribution
+            class="org.eclipse.jdt.ls.core.internal.corext.refactoring.ChangeMethodSignatureRefactoringContribution"
+            id="org.eclipse.jdt.ls.change.method.signature"/>
+   </extension>
 </plugin>

org.eclipse.jdt.ls.core/src/org/eclipse/jdt/ls/core/internal/IConstants.java

@@ -43,4 +43,6 @@ public interface IConstants {
 	 * Update workspace folders job family id
 	 */
 	public static final String UPDATE_WORKSPACE_FOLDERS_FAMILY = JOBS_FAMILY + ".updateWorkspaceFolders";
+
+	public static final String CHANGE_METHOD_SIGNATURE = "org.eclipse.jdt.ls.change.method.signature";
 }

org.eclipse.jdt.ls.core/src/org/eclipse/jdt/ls/core/internal/JavaCodeActionKind.java

@@ -93,6 +93,11 @@ public interface JavaCodeActionKind {
 	 */
 	public static final String REFACTOR_ASSIGN_FIELD = CodeActionKind.Refactor + ".assign.field";
 
+	/**
+	 * Introduce parameter
+	 */
+	public static final String REFACTOR_INTRODUCE_PARAMETER = CodeActionKind.Refactor + ".introduce.parameter";
+
 	/**
 	 * Base kind for "quickassist" code actions
 	 */

org.eclipse.jdt.ls.core/src/org/eclipse/jdt/ls/core/internal/corext/refactoring/BodyUpdater.java

@@ -0,0 +1,48 @@
+/*******************************************************************************
+ * Copyright (c) 2005, 2008 IBM Corporation and others.
+ *
+ * This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License 2.0
+ * which accompanies this distribution, and is available at
+ * https://www.eclipse.org/legal/epl-2.0/
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ *
+ * Originally copied from org.eclipse.jdt.internal.corext.refactoring.structure.BodyUpdater
+ *
+ * Contributors:
+ *     IBM Corporation - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.jdt.ls.core.internal.corext.refactoring;
+
+import org.eclipse.core.runtime.CoreException;
+import org.eclipse.jdt.core.dom.MethodDeclaration;
+import org.eclipse.jdt.internal.corext.refactoring.structure.CompilationUnitRewrite;
+import org.eclipse.ltk.core.refactoring.RefactoringStatus;
+
+
+public abstract class BodyUpdater {
+
+	/**
+	 * Updates the body of a method declaration. This method is called by the
+	 * {@link ChangeSignatureProcessor} and allows implementors to refactor the body
+	 * of the given method declaration.
+	 *
+	 * @param methodDeclaration
+	 * @param cuRewrite
+	 * @param result
+	 * @throws CoreException
+	 */
+	public abstract void updateBody(MethodDeclaration methodDeclaration, CompilationUnitRewrite cuRewrite, RefactoringStatus result) throws CoreException;
+
+	/**
+	 * Returns whether {@link ChangeSignatureProcessor} should check if
+	 * deleted parameters are currently used in the method body.
+	 *
+	 * @return <code>true</code> by default, subclasses can override
+	 */
+	public boolean needsParameterUsedCheck() {
+		return true;
+	}
+
+}

org.eclipse.jdt.ls.core/src/org/eclipse/jdt/ls/core/internal/corext/refactoring/ChangeMethodSignatureRefactoringContribution.java

@@ -0,0 +1,55 @@
+/*******************************************************************************
+ * Copyright (c) 2005, 2011 IBM Corporation and others.
+ *
+ * This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License 2.0
+ * which accompanies this distribution, and is available at
+ * https://www.eclipse.org/legal/epl-2.0/
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ *
+ * Copied from org.eclipse.jdt.internal.corext.refactoring.scripting.ChangeMethodSignatureRefactoringContribution
+ *
+ * Contributors:
+ *     IBM Corporation - initial API and implementation
+ *******************************************************************************/
+
+package org.eclipse.jdt.ls.core.internal.corext.refactoring;
+
+import java.util.Map;
+
+import org.eclipse.core.runtime.CoreException;
+import org.eclipse.jdt.core.refactoring.descriptors.JavaRefactoringContribution;
+import org.eclipse.jdt.core.refactoring.descriptors.JavaRefactoringDescriptor;
+import org.eclipse.jdt.internal.core.refactoring.descriptors.RefactoringSignatureDescriptorFactory;
+import org.eclipse.jdt.internal.corext.refactoring.JavaRefactoringArguments;
+import org.eclipse.ltk.core.refactoring.Refactoring;
+import org.eclipse.ltk.core.refactoring.RefactoringDescriptor;
+import org.eclipse.ltk.core.refactoring.RefactoringStatus;
+import org.eclipse.ltk.core.refactoring.participants.ProcessorBasedRefactoring;
+
+/**
+ * Refactoring contribution for the change method signature refactoring.
+ *
+ * @since 3.2
+ */
+public final class ChangeMethodSignatureRefactoringContribution extends JavaRefactoringContribution {
+
+	@Override
+	public Refactoring createRefactoring(JavaRefactoringDescriptor descriptor, RefactoringStatus status) throws CoreException {
+		JavaRefactoringArguments arguments= new JavaRefactoringArguments(descriptor.getProject(), retrieveArgumentMap(descriptor));
+		ChangeSignatureProcessor processor= new ChangeSignatureProcessor(arguments, status);
+		return new ProcessorBasedRefactoring(processor);
+	}
+
+	@Override
+	public RefactoringDescriptor createDescriptor() {
+		return RefactoringSignatureDescriptorFactory.createChangeMethodSignatureDescriptor();
+	}
+
+	@Override
+	public RefactoringDescriptor createDescriptor(String id, String project, String description, String comment, Map<String, String> arguments, int flags) {
+		return RefactoringSignatureDescriptorFactory.createChangeMethodSignatureDescriptor(project, description, comment, arguments, flags);
+	}
+
+}