CliSpecificationImpl.java

package org.caudexorigo.cli;

class CliSpecificationImpl
{
	private final String m_message;

	public CliSpecificationImpl(final CommandLineInterface cliSpecification, final UnparsedSpecificationImpl unparsedSpecification, final boolean mandatoryOptions)
	{
		if (cliSpecification == null && unparsedSpecification == null)
		{
			m_message = "The options available are:";
		}
		else
		{
			final StringBuilder message = new StringBuilder("Usage: ");

			if (cliSpecification != null && !nullOrBlank(cliSpecification.application()))
			{
				message.append(String.format("%s ", cliSpecification.application().trim()));
			}

			if (!mandatoryOptions)
			{
				message.append("[");
			}
			message.append("options");
			if (!mandatoryOptions)
			{
				message.append("]");
			}
			message.append(" ");

			if (unparsedSpecification != null)
			{
				final String unparsedName = !nullOrBlank(unparsedSpecification.getLongName()) ? unparsedSpecification.getLongName() : "ARGUMENTS";
				message.append(unparsedName);

				if (unparsedSpecification.isMultiValued())
				{
					message.append("...");
				}
			}
			m_message = message.toString().trim();
		}
	}

	private boolean nullOrBlank(final String string)
	{
		return (string == null || string.trim().equals(""));
	}

	@Override
	public String toString()
	{
		return m_message;
	}
}