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#55 Report null-assignment to an Optional + updated version to 1.6.0
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src/main/java/de/markiewb/netbeans/plugins/hints/optional/AssignNullToOptional.java
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/* | ||
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER. | ||
* | ||
* Copyright 2014 Oracle and/or its affiliates. All rights reserved. | ||
* | ||
* Oracle and Java are registered trademarks of Oracle and/or its affiliates. | ||
* Other names may be trademarks of their respective owners. | ||
* | ||
* The contents of this file are subject to the terms of either the GNU | ||
* General Public License Version 2 only ("GPL") or the Common | ||
* Development and Distribution License("CDDL") (collectively, the | ||
* "License"). You may not use this file except in compliance with the | ||
* License. You can obtain a copy of the License at | ||
* http://www.netbeans.org/cddl-gplv2.html | ||
* or nbbuild/licenses/CDDL-GPL-2-CP. See the License for the | ||
* specific language governing permissions and limitations under the | ||
* License. When distributing the software, include this License Header | ||
* Notice in each file and include the License file at | ||
* nbbuild/licenses/CDDL-GPL-2-CP. Oracle designates this | ||
* particular file as subject to the "Classpath" exception as provided | ||
* by Oracle in the GPL Version 2 section of the License file that | ||
* accompanied this code. If applicable, add the following below the | ||
* License Header, with the fields enclosed by brackets [] replaced by | ||
* your own identifying information: | ||
* "Portions Copyrighted [year] [name of copyright owner]" | ||
* | ||
* If you wish your version of this file to be governed by only the CDDL | ||
* or only the GPL Version 2, indicate your decision by adding | ||
* "[Contributor] elects to include this software in this distribution | ||
* under the [CDDL or GPL Version 2] license." If you do not indicate a | ||
* single choice of license, a recipient has the option to distribute | ||
* your version of this file under either the CDDL, the GPL Version 2 or | ||
* to extend the choice of license to its licensees as provided above. | ||
* However, if you add GPL Version 2 code and therefore, elected the GPL | ||
* Version 2 license, then the option applies only if the new code is | ||
* made subject to such option by the copyright holder. | ||
* | ||
* Contributor(s): | ||
* | ||
* Portions Copyrighted 2014 Sun Microsystems, Inc. | ||
* Portions Copyrighted 2014 [email protected] | ||
*/ | ||
package de.markiewb.netbeans.plugins.hints.optional; | ||
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import java.util.Optional; | ||
import org.netbeans.spi.editor.hints.ErrorDescription; | ||
import org.netbeans.spi.editor.hints.Fix; | ||
import org.netbeans.spi.editor.hints.Severity; | ||
import org.netbeans.spi.java.hints.ConstraintVariableType; | ||
import org.netbeans.spi.java.hints.ErrorDescriptionFactory; | ||
import org.netbeans.spi.java.hints.Hint; | ||
import org.netbeans.spi.java.hints.HintContext; | ||
import org.netbeans.spi.java.hints.TriggerPattern; | ||
import org.netbeans.spi.java.hints.TriggerPatterns; | ||
import org.openide.util.NbBundle; | ||
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/** | ||
* | ||
* @author markiewb | ||
*/ | ||
@NbBundle.Messages({ | ||
"DN_AssignNull=Replace with Optional.empty()", | ||
"DESC_AssignNull=<tt>java.util.Optional</tt> should not be null, so replace null-assignment with <tt>Optional.empty()</tt>. <p>For example: <tt>Optional<T> o = null;</tt> will be transformed to <tt>Optional<T> o = Optional.empty();</tt></p><p>Provided by <a href=\"https://github.com/markiewb/nb-additional-hints\">nb-additional-hints</a> plugin</p>",}) | ||
public class AssignNullToOptional { | ||
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@TriggerPatterns({ | ||
@TriggerPattern(value = "$var1 = null", constraints = @ConstraintVariableType(variable = "$var1", type = "java.util.Optional")), | ||
@TriggerPattern(value = "$class $var2 = null", constraints = @ConstraintVariableType(variable = "$var2", type = "java.util.Optional")), | ||
}) | ||
@Hint(displayName = "#DN_AssignNull", description = "#DESC_AssignNull", category = "bugs", hintKind = Hint.Kind.INSPECTION, severity = Severity.ERROR) | ||
@NbBundle.Messages("ERR_AssignNull=Replace with Optional.isPresent()") | ||
public static ErrorDescription convertToOptional(HintContext ctx) { | ||
String result = null; | ||
if (ctx.getVariables().containsKey("$var1")) { | ||
result = "$var1 = Optional.empty()"; | ||
} | ||
if (ctx.getVariables().containsKey("$var2")) { | ||
result = "$class $var2 = Optional.empty()"; | ||
} | ||
if (result != null) { | ||
Fix fix = org.netbeans.spi.java.hints.JavaFixUtilities.rewriteFix(ctx, Bundle.ERR_AssignNull(), ctx.getPath(), result); | ||
return ErrorDescriptionFactory.forName(ctx, ctx.getPath(), Bundle.ERR_AssignNull(), fix); | ||
} | ||
return null; | ||
} | ||
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} |
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66
src/test/java/de/markiewb/netbeans/plugins/hints/optional/AssingNullToOptionalTest.java
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/* | ||
* To change this license header, choose License Headers in Project Properties. | ||
* To change this template file, choose Tools | Templates | ||
* and open the template in the editor. | ||
*/ | ||
package de.markiewb.netbeans.plugins.hints.optional; | ||
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import org.junit.Test; | ||
import org.netbeans.modules.java.hints.test.api.HintTest; | ||
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/** | ||
* | ||
* @author markiewb | ||
*/ | ||
public class AssingNullToOptionalTest { | ||
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@Test | ||
public void testCaseAssignmentToExisting() throws Exception { | ||
HintTest.create() | ||
.input("package test;\n" | ||
+ "import java.util.Optional;\n" | ||
+ "public class Test {\n" | ||
+ " public void method() {\n" | ||
+ " Optional o;\n" | ||
+ " o = null;\n" | ||
+ " }\n" | ||
+ "}") | ||
.sourceLevel("1.8") | ||
.run(AssignNullToOptional.class) | ||
.findWarning("5:8-5:16:error:" + de.markiewb.netbeans.plugins.hints.optional.Bundle.ERR_AssignNull()) | ||
.applyFix() | ||
.assertOutput("package test;\n" | ||
+ "import java.util.Optional;\n" | ||
+ "public class Test {\n" | ||
+ " public void method() {\n" | ||
+ " Optional o;\n" | ||
+ " o = Optional.empty();\n" | ||
+ " }\n" | ||
+ "}"); | ||
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} | ||
@Test | ||
public void testCaseAssignmentToNewVariable() throws Exception { | ||
HintTest.create() | ||
.input("package test;\n" | ||
+ "import java.util.Optional;\n" | ||
+ "public class Test {\n" | ||
+ " public void method() {\n" | ||
+ " Optional o = null;\n" | ||
+ " }\n" | ||
+ "}") | ||
.sourceLevel("1.8") | ||
.run(AssignNullToOptional.class) | ||
.findWarning("4:17-4:18:error:" + de.markiewb.netbeans.plugins.hints.optional.Bundle.ERR_AssignNull()) | ||
.applyFix() | ||
.assertOutput("package test;\n" | ||
+ "import java.util.Optional;\n" | ||
+ "public class Test {\n" | ||
+ " public void method() {\n" | ||
+ " Optional o = Optional.empty();\n" | ||
+ " }\n" | ||
+ "}"); | ||
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} | ||
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} |
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