org.jvnet.jaxb2_commons.plugin.AbstractParameterizablePlugin Maven / Gradle / Ivy

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package org.jvnet.jaxb2_commons.plugin;

import java.io.IOException;

import org.apache.commons.beanutils.BeanUtils;

import com.sun.tools.xjc.BadCommandLineException;
import com.sun.tools.xjc.Options;

/**
 * Abstract base class for parameterizable JAXB plugins.
 * 
 * This plugin looks for the arguments of the form
 * -myPlugin-name=value
 * (myPlugin is the plugin option name) and
 * then invokes setName(value) on itself.

 * For instance, the argument -Xfoo-bar=test triggers
 * setBar("test") invocation.
 * Values are injected using Commons BeanUtils as bean properties, so
 * types will be converted correspondingly
 *  
 * @author valikov
 */
public abstract class AbstractParameterizablePlugin extends AbstractPlugin {

	/**
	 * Parses the arguments and injects values into the beans via properties.
	 */
	public int parseArgument(Options opt, String[] args, int start)
			throws BadCommandLineException, IOException {

		int consumed = 0;
		final String optionPrefix = "-" + getOptionName() + "-";
		final int optionPrefixLength = optionPrefix.length();

		final String arg = args[start];
		final int equalsPosition = arg.indexOf('=');

		if (arg.startsWith(optionPrefix) && equalsPosition > optionPrefixLength) {
			final String propertyName = arg.substring(optionPrefixLength,
					equalsPosition);

			final String value = arg.substring(equalsPosition + 1);
			consumed++;
			try {
				BeanUtils.setProperty(this, propertyName, value);
			} catch (Exception ex) {
				ex.printStackTrace();
				throw new BadCommandLineException("Error setting property ["
						+ propertyName + "], value [" + value + "].");
			}
		}
		return consumed;
	}
}