Add a switch to include pom projects.

Add a new configuration setting, includePomProjects and property that
allows executing the duplicate finder plugin on projects with POM
packaging.

For backwards compatibility, this is turned off by default.

CHANGES.md

@@ -1,5 +1,10 @@
 # Changes
 
+##### 1.2.0
+
+* Add `includePomProjects` configuration setting to allow projects with POM packaging to
+be checked. Suggested by #11. Thanks @camshoff.
+
 ##### 1.1.2 - 2015-06-16
 
 __1.1.2 will be the last release that works with JDK 6! With Maven having moved to JDK 7, there

pom.xml

@@ -17,7 +17,7 @@
     <parent>
         <groupId>org.basepom</groupId>
         <artifactId>basepom-standard-oss</artifactId>
-        <version>11</version>
+        <version>12</version>
     </parent>
 
     <groupId>org.basepom.maven</groupId>

src/it/test-pom-project/invoker.properties

@@ -0,0 +1,16 @@
+#
+# Licensed 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.
+#
+
+invoker.goals=clean verify
+invoker.buildResult = success

src/it/test-pom-project/pom.xml

@@ -0,0 +1,52 @@
+<!--
+~   Licensed 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.
+-->
+<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/maven-v4_0_0.xsd">
+
+    <modelVersion>4.0.0</modelVersion>
+
+    <parent>
+        <groupId>@project.groupId@.@project.artifactId@</groupId>
+        <artifactId>basepom</artifactId>
+        <version>1.0.under-test</version>
+    </parent>
+
+    <artifactId>test-pom-project</artifactId>
+    <packaging>pom</packaging>
+
+    <dependencies>
+        <dependency>
+            <groupId>testjar</groupId>
+            <artifactId>first-jar</artifactId>
+            <version>1.0.under-test</version>
+        </dependency>
+        <dependency>
+            <groupId>testjar</groupId>
+            <artifactId>second-jar</artifactId>
+            <version>1.0.under-test</version>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>@project.groupId@</groupId>
+                <artifactId>@project.artifactId@</artifactId>
+                <configuration>
+                    <includePomProjects>true</includePomProjects>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+</project>

src/it/test-pom-project/verify.groovy

@@ -0,0 +1,22 @@
+/*
+ * Licensed 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.
+ */
+import static org.basepom.mojo.duplicatefinder.groovy.ITools.*
+
+def result = loadTestXml(basedir)
+
+overallState(CONFLICT_DIFF, 1, NOT_FAILED, result) // This is "1" because both conflictResults are in the same conflict.
+checkConflictResult("conflict-same-content",      TYPE_RESOURCE, CONFLICT_EQUAL, NOT_EXCEPTED, NOT_PRINTED, NOT_FAILED, findConflictResult(result, 2, FIRST_JAR, SECOND_JAR))
+checkConflictResult("conflict-different-content", TYPE_RESOURCE, CONFLICT_DIFF,  NOT_EXCEPTED, PRINTED,     NOT_FAILED, findConflictResult(result, 2, FIRST_JAR, SECOND_JAR))
+
+return true

src/main/java/org/basepom/mojo/duplicatefinder/DuplicateFinderMojo.java

@@ -253,6 +253,14 @@ public final class DuplicateFinderMojo extends AbstractMojo
     @Parameter(defaultValue="sun.boot.class.path", property = "duplicate-finder.bootClasspathProperty")
     protected String bootClasspathProperty = "sun.boot.class.path";
 
+    /**
+     * Include POM projects in validation.
+     *
+     * @since 1.2.0
+     */
+    @Parameter(defaultValue="false", property = "duplicate-finder.includePomProjects")
+    protected boolean includePomProjects = false;
+
     private final EnumSet<ConflictState> printState = EnumSet.of(CONFLICT_CONTENT_DIFFERENT);
     private final EnumSet<ConflictState> failState = EnumSet.noneOf(ConflictState.class);
 
@@ -281,7 +289,7 @@ public void execute() throws MojoExecutionException
             if (skip) {
                 LOG.report(quiet, "Skipping duplicate-finder execution!");
             }
-            else if ("pom".equals(project.getArtifact().getType())) {
+            else if (!includePomProjects && "pom".equals(project.getArtifact().getType())) {
                 LOG.report(quiet, "Ignoring POM project!");
             }
             else {