/**
 * 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.camel.maven.packaging;

import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Properties;

import org.apache.maven.model.Resource;
import org.apache.maven.plugin.AbstractMojo;
import org.apache.maven.plugin.MojoExecutionException;
import org.apache.maven.plugin.MojoFailureException;
import org.apache.maven.project.MavenProject;
import org.apache.maven.project.MavenProjectHelper;

/**
 * Analyses the Camel plugins in a project and generates extra descriptor information for easier auto-discovery in Camel.
 *
 * @goal generate-components-list
 * @execute phase="generate-resources"
 */
public class PackageMojo extends AbstractMojo {

    /**
     * The maven project.
     *
     * @parameter property="project"
     * @required
     * @readonly
     */
    protected MavenProject project;

    /**
     * The output directory for generated components file
     *
     * @parameter default-value="${project.build.directory}/generated/camel/components"
     */
    protected File outDir;

    /**
     * Maven ProjectHelper.
     *
     * @component
     * @readonly
     */
    private MavenProjectHelper projectHelper;

    /**
     * Execute goal.
     *
     * @throws MojoExecutionException execution of the main class or one of the
     *                 threads it generated failed.
     * @throws MojoFailureException something bad happened...
     */
    public void execute() throws MojoExecutionException, MojoFailureException {
        File camelMetaDir = new File(outDir, "META-INF/services/org/apache/camel/");

        StringBuilder buffer = new StringBuilder();
        int count = 0;
        for (Resource r : project.getBuild().getResources()) {
            File f = new File(r.getDirectory());
            if (!f.exists()) {
                f = new File(project.getBasedir(), r.getDirectory());
            }
            f = new File(f, "META-INF/services/org/apache/camel/component");
            
            if (f.exists()) {
                File[] files = f.listFiles();
                for (File file : files) {
                    String name = file.getName();
                    if (name.charAt(0) != '.') {
                        count++;
                        if (buffer.length() > 0) {
                            buffer.append(" ");
                        }
                        buffer.append(name);
                    }
                }
            }
        }
        
        if (count > 0) {
            Properties properties = new Properties();
            String names = buffer.toString();
            properties.put("components", names);
            properties.put("groupId", project.getGroupId());
            properties.put("artifactId", project.getArtifactId());
            properties.put("version", project.getVersion());
            properties.put("projectName", project.getName());
            properties.put("projectDescription", project.getDescription());

            camelMetaDir.mkdirs();
            File outFile = new File(camelMetaDir, "component.properties");
            try {
                properties.store(new FileWriter(outFile), "Generated by camel-package-maven-plugin");
                getLog().info("Generated " + outFile + " containing the Camel " + (count > 1 ? "components " : "component ") + names);

                if (projectHelper != null) {
                    List<String> includes = new ArrayList<String>();
                    includes.add("**/component.properties");
                    projectHelper.addResource(this.project, outDir.getPath(), includes, new ArrayList<String>());
                    projectHelper.attachArtifact(this.project, "properties", "camelComponent", outFile);
                }
            } catch (IOException e) {
                throw new MojoExecutionException("Failed to write properties to " + outFile + ". Reason: " + e, e);
            }
        } else {
            getLog().debug("No META-INF/services/org/apache/camel/component directory found. Are you sure you have created a Camel component?");
        }
    }

}

@@ -2845,36 +2845,55 @@
   if (f.exists()
+ && f.isDirectory()
 ) %7B%0A
-
                 
@@ -2918,24 +2918,65 @@
 istFiles();%0A
+                if (files != null) %7B%0A    
             
@@ -3001,24 +3001,28 @@
  : files) %7B%0A
+    
             
@@ -3075,24 +3075,28 @@
             
+   
+ 
 if (name.cha
@@ -3136,16 +3136,20 @@
         
+    
 count++;
@@ -3169,24 +3169,28 @@
             
+ 
+   
 if (buffer.l
@@ -3224,32 +3224,36 @@
                 
+   
+ 
 buffer.append(%22 
@@ -3272,32 +3272,36 @@
                 
+    
 %7D%0A              
@@ -3302,32 +3302,36 @@
                 
+ 
+   
 buffer.append(na
@@ -3331,24 +3331,50 @@
 pend(name);%0A
+                        %7D%0A
             

Fix potential NPE