[MNG-5910] Warn if both exists and missing file activation are set (#1773)

api/maven-api-model/src/main/mdo/maven.mdo

@@ -2892,14 +2892,15 @@
           <name>missing</name>
           <version>4.0.0+</version>
           <type>String</type>
-          <description>The name of the file that must be missing to activate the
+          <description>The name of the file that must be missing to activate the profile. Please note, that missing and exists
-          profile.</description>
+          fields cannot be used together. Only one of them should be used at any one time.</description>
         </field>
         <field>
           <name>exists</name>
           <version>4.0.0+</version>
           <type>String</type>
-          <description>The name of the file that must exist to activate the profile.</description>
+          <description>The name of the file that must exist to activate the profile. Please note, that missing and exists
+          fields cannot be used together. Only one of them should be used at any one time.</description>
         </field>
       </fields>
     </class>

api/maven-api-settings/src/main/mdo/settings.mdo

@@ -975,7 +975,8 @@
           <version>1.0.0+</version>
           <type>String</type>
           <description>
-            The name of the file that should be missing to activate a profile.
+            The name of the file that should be missing to activate a profile. Please note, that missing and exists
+            fields cannot be used together. Only one of them should be used at any one time.
           </description>
         </field>
         <field>
@@ -983,7 +984,8 @@
           <version>1.0.0+</version>
           <type>String</type>
           <description>
-            The name of the file that should exist to activate a profile.
+            The name of the file that should exist to activate a profile. Please note, that missing and exists
+            fields cannot be used together. Only one of them should be used at any one time.
           </description>
         </field>
       </fields>

maven-api-impl/src/main/java/org/apache/maven/internal/impl/model/profile/FileProfileActivator.java

@@ -70,10 +70,22 @@ public class FileProfileActivator implements ProfileActivator {
         String path;
         boolean missing;
 
-        if (file.getExists() != null && !file.getExists().isEmpty()) {
+        boolean hasExists = file.getExists() != null && !file.getExists().isEmpty();
+        boolean hasMissing = file.getMissing() != null && !file.getMissing().isEmpty();
+        if (hasExists) {
+            if (hasMissing) {
+                problems.add(
+                        BuilderProblem.Severity.WARNING,
+                        ModelProblem.Version.BASE,
+                        String.format(
+                                "Profile '%s' file activation conflict: Both 'missing' (%s) and 'exists' assertions are defined. "
+                                        + "The 'missing' assertion will be ignored. Please remove one assertion to resolve this conflict.",
+                                profile.getId(), file.getMissing()),
+                        file.getLocation("missing"));
+            }
             path = file.getExists();
             missing = false;
-        } else if (file.getMissing() != null && !file.getMissing().isEmpty()) {
+        } else if (hasMissing) {
             path = file.getMissing();
             missing = true;
         } else {

maven-api-impl/src/test/java/org/apache/maven/internal/impl/model/ComplexActivationTest.java

@@ -0,0 +1,87 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.maven.internal.impl.model;
+
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.Map;
+
+import org.apache.maven.api.Session;
+import org.apache.maven.api.services.BuilderProblem;
+import org.apache.maven.api.services.ModelBuilder;
+import org.apache.maven.api.services.ModelBuilderRequest;
+import org.apache.maven.api.services.ModelBuilderResult;
+import org.apache.maven.api.services.ModelSource;
+import org.apache.maven.internal.impl.standalone.ApiRunner;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertNull;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+/**
+ *
+ */
+class ComplexActivationTest {
+
+    Session session;
+    ModelBuilder builder;
+
+    @BeforeEach
+    void setup() {
+        session = ApiRunner.createSession();
+        builder = session.getService(ModelBuilder.class);
+        assertNotNull(builder);
+    }
+
+    @Test
+    void testAndConditionInActivation() throws Exception {
+        ModelBuilderRequest request = ModelBuilderRequest.builder()
+                .session(session)
+                .requestType(ModelBuilderRequest.RequestType.BUILD_POM)
+                .source(ModelSource.fromPath(getPom("complex")))
+                .systemProperties(Map.of("myproperty", "test"))
+                .build();
+        ModelBuilderResult result = builder.newSession().build(request);
+        assertNotNull(result);
+        assertNotNull(result.getEffectiveModel());
+        assertEquals("activated-1", result.getEffectiveModel().getProperties().get("profile.file"));
+        assertNull(result.getEffectiveModel().getProperties().get("profile.miss"));
+    }
+
+    @Test
+    public void testConditionExistingAndMissingInActivation() throws Exception {
+        ModelBuilderRequest request = ModelBuilderRequest.builder()
+                .session(session)
+                .requestType(ModelBuilderRequest.RequestType.BUILD_POM)
+                .source(ModelSource.fromPath(getPom("complexExistsAndMissing")))
+                .build();
+        ModelBuilderResult result = builder.newSession().build(request);
+        assertNotNull(result);
+        assertTrue(result.getProblems().stream()
+                .anyMatch(p -> p.getSeverity() == BuilderProblem.Severity.WARNING
+                        && p.getMessage().contains("The 'missing' assertion will be ignored.")));
+    }
+
+    private Path getPom(String name) {
+        return Paths.get("src/test/resources/poms/factory/" + name + ".xml").toAbsolutePath();
+    }
+}

maven-api-impl/src/test/resources/poms/factory/complex.xml

@@ -0,0 +1,49 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>test</groupId>
+    <artifactId>test</artifactId>
+    <version>0.1-SNAPSHOT</version>
+    <packaging>pom</packaging>
+
+    <properties>
+        <my.filter.value>hello</my.filter.value>
+    </properties>
+
+    <profiles>
+        <profile>
+            <id>two-conditions</id>
+            <activation>
+                <file>
+                    <exists>complex.xml</exists>
+                </file>
+                <property>
+                    <name>myproperty</name>
+                    <value>test</value>
+                </property>
+            </activation>
+            <properties>
+                <profile.file>activated-1</profile.file>
+            </properties>
+        </profile>
+        <profile>
+            <id>another-two-conditions</id>
+            <activation>
+                <property>
+                    <name>myproperty</name>
+                    <value>test</value>
+                </property>
+                <file>
+                    <missing>complex.xml</missing>
+                </file>
+            </activation>
+            <properties>
+                <profile.miss>activated-2</profile.miss>
+            </properties>
+        </profile>
+    </profiles>
+</project>

maven-api-impl/src/test/resources/poms/factory/complexExistsAndMissing.xml

@@ -0,0 +1,24 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>test</groupId>
+    <artifactId>test</artifactId>
+    <version>0.1-SNAPSHOT</version>
+    <packaging>pom</packaging>
+
+    <profiles>
+        <profile>
+            <id>two-conditions</id>
+            <activation>
+                <file>
+                    <exists>simple.xml</exists>
+                    <missing>true</missing>
+                </file>
+            </activation>
+        </profile>
+    </profiles>
+</project>