Add "failOnViolation" setting to optionally fail builds

src/main/docs/ant-task.html

@@ -109,6 +109,13 @@ <h2>Parameters</h2>
   <td>Fail the build if a signature is not resolving. If this parameter is set to to false, then such signatures are silently ignored.</td>
 </tr>
 
+<tr>
+  <td>failOnViolation</td>
+  <td><code>boolean</code></td>
+  <td><code>true</code></td>
+  <td>Fail the build if violations have been found. If this parameter is set to <code>false</code>, then the build will continue even if violations have been found.</td>
+</tr>
+
 <tr>
   <td>internalRuntimeForbidden</td>
   <td><code>boolean</code></td>

src/main/java/de/thetaphi/forbiddenapis/AbstractCheckMojo.java

@@ -97,7 +97,14 @@ public abstract class AbstractCheckMojo extends AbstractMojo {
    */
   @Parameter(required = false, defaultValue = "true")
   private boolean failOnUnresolvableSignatures;
-
+
+  /**
+   * Fail the build if violations have been found. Defaults to {@code true}.
+   * @since 1.9
+   */
+  @Parameter(required = false, property="forbiddenapis.failOnViolation", defaultValue = "true")
+  private boolean failOnViolation;
+
   /**
    * The default compiler target version used to expand references to bundled JDK signatures.
    * E.g., if you use "jdk-deprecated", it will expand to this version.
@@ -200,7 +207,7 @@ public void execute() throws MojoExecutionException, MojoFailureException {
       ClassLoader.getSystemClassLoader();
 
     try {
-      final Checker checker = new Checker(loader, internalRuntimeForbidden, failOnMissingClasses, failOnUnresolvableSignatures) {
+      final Checker checker = new Checker(loader, internalRuntimeForbidden, failOnMissingClasses, failOnViolation, failOnUnresolvableSignatures) {
         @Override
         protected void logError(String msg) {
           log.error(msg);

src/main/java/de/thetaphi/forbiddenapis/AntTask.java

@@ -59,6 +59,7 @@ public final class AntTask extends Task {
   private boolean restrictClassFilename = true;
   private boolean failOnMissingClasses = true;
   private boolean failOnUnresolvableSignatures = true;
+  private boolean failOnViolation = true;
   private boolean ignoreEmptyFileset = false;
 
   @Override
@@ -76,7 +77,7 @@ public void execute() throws BuildException {
       classFiles.setProject(getProject());
       apiSignatures.setProject(getProject());
 
-      final Checker checker = new Checker(loader, internalRuntimeForbidden, failOnMissingClasses, failOnUnresolvableSignatures) {
+      final Checker checker = new Checker(loader, internalRuntimeForbidden, failOnMissingClasses, failOnViolation, failOnUnresolvableSignatures) {
         @Override
         protected void logError(String msg) {
           log(msg, Project.MSG_ERR);
@@ -325,4 +326,12 @@ public void setIgnoreEmptyFileSet(boolean ignoreEmptyFileset) {
     this.ignoreEmptyFileset = ignoreEmptyFileset;
   }
 
+  /**
+   * Fail the build if violations have been found. If this parameter is set to {@code false},
+   * then the build will continue even if violations have been found.
+   * Defaults to {@code true}.
+   */
+  public void setFailOnViolation(boolean failOnViolation) {
+    this.failOnViolation = failOnViolation;
+  }
 }

src/main/java/de/thetaphi/forbiddenapis/Checker.java

@@ -64,7 +64,7 @@ public abstract class Checker implements RelatedClassLookup {
   final Set<File> bootClassPathJars;
   final Set<String> bootClassPathDirs;
   final ClassLoader loader;
-  final boolean internalRuntimeForbidden, failOnMissingClasses, defaultFailOnUnresolvableSignatures;
+  final boolean internalRuntimeForbidden, failOnMissingClasses, failOnViolation, defaultFailOnUnresolvableSignatures;
 
   // key is the internal name (slashed):
   final Map<String,ClassSignature> classesToCheck = new HashMap<String,ClassSignature>();
@@ -86,10 +86,11 @@ public abstract class Checker implements RelatedClassLookup {
   protected abstract void logWarn(String msg);
   protected abstract void logInfo(String msg);
 
-  public Checker(ClassLoader loader, boolean internalRuntimeForbidden, boolean failOnMissingClasses, boolean defaultFailOnUnresolvableSignatures) {
+  public Checker(ClassLoader loader, boolean internalRuntimeForbidden, boolean failOnMissingClasses, boolean failOnViolation, boolean defaultFailOnUnresolvableSignatures) {
     this.loader = loader;
     this.internalRuntimeForbidden = internalRuntimeForbidden;
     this.failOnMissingClasses = failOnMissingClasses;
+    this.failOnViolation = failOnViolation;
     this.defaultFailOnUnresolvableSignatures = defaultFailOnUnresolvableSignatures;
     this.start = System.currentTimeMillis();
 
@@ -439,7 +440,7 @@ public final void run() throws ForbiddenApiException {
     final String message = String.format(Locale.ENGLISH, 
         "Scanned %d (and %d related) class file(s) for forbidden API invocations (in %.2fs), %d error(s).",
         classesToCheck.size(), classesToCheck.isEmpty() ? 0 : classpathClassCache.size(), (System.currentTimeMillis() - start) / 1000.0, errors);
-    if (errors > 0) {
+    if (failOnViolation && errors > 0) {
       logError(message);
       throw new ForbiddenApiException("Check for forbidden API calls failed, see log.");
     } else {

src/main/java/de/thetaphi/forbiddenapis/CliMain.java

@@ -221,7 +221,7 @@ public void run() throws ExitException {
     final URLClassLoader loader = URLClassLoader.newInstance(urls, ClassLoader.getSystemClassLoader());
     try {
       final Checker checker = new Checker(loader, cmd.hasOption(internalruntimeforbiddenOpt.getLongOpt()),
-        !cmd.hasOption(allowmissingclassesOpt.getLongOpt()), !cmd.hasOption(allowunresolvablesignaturesOpt.getLongOpt())) {
+        !cmd.hasOption(allowmissingclassesOpt.getLongOpt()), true, !cmd.hasOption(allowunresolvablesignaturesOpt.getLongOpt())) {
         @Override
         protected void logError(String msg) {
           CliMain.this.logError(msg);

src/test/antunit/TestFailOnViolation.xml

@@ -0,0 +1,40 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+ * (C) Copyright Uwe Schindler (Generics Policeman) and others.
+ *
+ * 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:au="antlib:org.apache.ant.antunit">
+
+  <fileset id="main.classes" dir="${antunit.main.classes}"/>
+
+  <target name="testFailOnViolation">
+    <au:expectfailure expectedMessage="Check for forbidden API calls failed, see log">
+      <forbiddenapis classpathref="path.all">
+        <fileset refid="main.classes"/>
+        java.awt.Color @ Color is disallowed, thats not bad, because ANT has no colors...
+        java.lang.String @ You are crazy that you disallow strings
+      </forbiddenapis>
+    </au:expectfailure>
+    <au:assertLogContains level="error" text="java.lang.String [You are crazy that you disallow strings]"/>
+  </target>
+
+  <target name="testDoNotFailOnViolation">
+    <forbiddenapis classpathref="path.all" failOnViolation="false">
+      <fileset refid="main.classes"/>
+      java.awt.Color @ Color is disallowed, thats not bad, because ANT has no colors...
+      java.lang.String @ You are crazy that you disallow strings
+    </forbiddenapis>
+    <au:assertLogContains level="error" text="java.lang.String [You are crazy that you disallow strings]"/>
+  </target>
+</project>

src/test/antunit/TestMavenMojo.xml

@@ -43,6 +43,16 @@
     </au:expectfailure>
     <au:assertLogContains text="You are crazy that you disallow strings"/> 
   </target>
+
+  <target name="testFailOnViolation">
+    <artifact:mvn pom="${antunit.fake-pom}" mavenVersion="${maven.version}" failonerror="true" fork="true">
+      <arg value="${groupId}:${artifactId}:${version}:check"/>
+      <syspropertyset refid="injected-properties"/>
+      <sysproperty key="antunit.failOnViolation" value="false"/>
+      <sysproperty key="antunit.signatures" value="java.lang.String @ You are crazy that you disallow strings"/>
+    </artifact:mvn>
+    <au:assertLogContains text="You are crazy that you disallow strings"/>
+  </target>
 
   <target name="testFailOnUnresolveableSignaturesMaven2">
     <au:expectfailure>

src/test/antunit/pom-generator.xsl

@@ -48,6 +48,7 @@
             <configuration>
               <internalRuntimeForbidden>true</internalRuntimeForbidden>
               <failOnUnresolvableSignatures>${antunit.failOnUnresolvableSignatures}</failOnUnresolvableSignatures>
+              <failOnViolation>${antunit.failOnViolation}</failOnViolation>
               <bundledSignatures>
                 <bundledSignature>jdk-unsafe</bundledSignature>
                 <bundledSignature>jdk-deprecated</bundledSignature>

src/test/java/de/thetaphi/forbiddenapis/CheckerSetupTest.java

@@ -29,7 +29,7 @@ public final class CheckerSetupTest {
   @SuppressForbidden
   static final class MyChecker extends Checker {
     public MyChecker() {
-      super(ClassLoader.getSystemClassLoader(), true, true, true);
+      super(ClassLoader.getSystemClassLoader(), true, true, true, true);
     }
 
     @Override