DefaultValue.java

package org.springframework.roo.addon.tailor.actions;

import org.apache.commons.lang3.StringUtils;
import org.apache.felix.scr.annotations.Component;
import org.apache.felix.scr.annotations.Service;
import org.springframework.roo.addon.tailor.CommandTransformation;

/**
 * Adds default argument to the command If default argument is forced it will be
 * always replaced
 * 
 * @author Vladimir Tihomirov
 */
@Component
@Service
public class DefaultValue extends AbstractAction {

  @Override
  public void executeImpl(final CommandTransformation arg, final ActionConfig config) {
    // Allow argument name with and without "--" in config
    String argumentName = config.getArgument();
    if (argumentName.startsWith("--")) {
      argumentName = argumentName.substring(2);
    }
    // Change both the command string and update the arguments
    if (!arg.getInputCommand().contains("--" + argumentName)) {
      arg.setInputCommand(arg.getInputCommand().concat(" --").concat(argumentName).concat(" ")
          .concat(config.getDefaultValue()));
      // Update the arguments, so that subsequent actions will be based on
      // this default value
      arg.getArguments().put(argumentName, config.getDefaultValue());
    } else if (config.isForced()) {
      final String oldValue = arg.getArguments().get(argumentName);
      if (StringUtils.isNotBlank(oldValue)) {
        // Replace the old value with the default one
        arg.setInputCommand(arg.getInputCommand().replace("--" + argumentName + " " + oldValue,
            "--" + argumentName + " " + config.getDefaultValue()));
        arg.getArguments().put(argumentName, config.getDefaultValue());
      }
    }

  }

  public String getDescription(final ActionConfig config) {
    return "Setting default argument: " + config.getArgument() + " = " + config.getDefaultValue();
  }

  public boolean isValid(final ActionConfig config) {
    return config != null && StringUtils.isNotBlank(config.getArgument())
        && StringUtils.isNotBlank(config.getDefaultValue());
  }
}