package org_scala_tools_maven_executions;
   
   import java.io.File;
   import java.util.ArrayList;
   import java.util.List;
   
   import org.apache.maven.plugin.AbstractMojo;
   import org.codehaus.plexus.util.StringUtils;
   /**
   * Abstract helper implementation for JavaMainCaller interface.
   * @author josh
   *
   */
  public abstract class JavaMainCallerSupport implements JavaMainCaller {
  
      protected AbstractMojo requester;
      protected List<String> env  = new ArrayList<String>();
      protected String mainClassName;
      protected List<String> jvmArgs = new ArrayList<String>();
      protected List<String> args = new ArrayList<String>();
  
  
      protected JavaMainCallerSupport(AbstractMojo requester, String mainClassName, String classpath, String[] jvmArgs, String[] args) throws Exception {
          this.requester = requester;
          for (String key : System.getenv().keySet()) {
              env.add(key + "=" + System.getenv(key));
          }
          this.mainClassName = mainClassName;
          addJvmArgs("-classpath", classpath);
          addJvmArgs(jvmArgs);
          addArgs(args);
      }
  
      public void addJvmArgs(String... args) {
          if(args != null) {
              for(String arg : args) {
                  if (StringUtils.isNotEmpty(arg)) {
                      this.jvmArgs.add(arg);
                  }
              }
          }
      }
  
      public void addToClasspath(File entry) throws Exception {
          if ((entry == null) || !entry.exists()) {
              return;
          }
          boolean isClasspath = false;
          for (int i = 0; i < jvmArgs.size(); i++) {
              String item = jvmArgs.get(i);
              if (isClasspath) {
                  item = item + File.pathSeparator + entry.getCanonicalPath();
                  jvmArgs.set(i, item);
                  isClasspath = false;
                  break;
              }
              isClasspath = "-classpath".equals(item);
          }
      }
  
      public void addOption(String key, String value) {
          if (StringUtils.isEmpty(value) || StringUtils.isEmpty(key)) {
              return;
          }
          addArgs(key, value);
      }
  
      public void addOption(String key, File value) {
          if ( (value == null) || StringUtils.isEmpty(key)) {
              return;
          }
          addArgs(key, value.getAbsolutePath());
      }
  
      public void addOption(String key, boolean value) {
          if ((!value) || StringUtils.isEmpty(key)) {
              return;
          }
          addArgs(key);
      }
      public void addArgs(String... args) {
          if(args != null) {
              for(String arg : args) {
                  if (StringUtils.isNotEmpty(arg)) {
                      this.args.add(arg);
                  }
              }
          }
      }
  
      public void addEnvVar(String key, String value) {
          this.env.add(key + "=" + value);
  
      }
      public void run(boolean displayCmd) throws Exception {
          run(displayCmd, true);
      }
  }