ListPreferences.java

/*******************************************************************************
 * Copyright (c) 2004, 2006
 * Thomas Hallgren, Kenneth Olwing, Mitch Sonies
 * Pontus Rydin, Nils Unden, Peer Torngren
 * The code, documentation and other materials contained herein have been
 * licensed under the Eclipse Public License - v 1.0 by the individual
 * copyright holders listed above, as Initial Contributors under such license.
 * The text of such license is available at www.eclipse.org.
 *******************************************************************************/

package org.eclipse.buckminster.core.commands;

import java.io.PrintStream;
import java.util.List;

import org.eclipse.buckminster.cmdline.AbstractCommand;
import org.eclipse.buckminster.cmdline.BasicPreferenceHandler;
import org.eclipse.buckminster.cmdline.Option;
import org.eclipse.buckminster.cmdline.OptionDescriptor;
import org.eclipse.buckminster.cmdline.OptionValueType;
import org.eclipse.buckminster.cmdline.SimpleErrorExitException;
import org.eclipse.buckminster.core.Messages;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.osgi.util.NLS;

/**
 * @author kolwing
 */
public class ListPreferences extends AbstractCommand {
	static private final OptionDescriptor TEST_DESCRIPTOR = new OptionDescriptor(null, "__test", //$NON-NLS-1$
			OptionValueType.NONE);

	private boolean test = false;

	private String pattern = null;

	@Override
	protected void getOptionDescriptors(List<OptionDescriptor> appendHere) throws Exception {
		appendHere.add(TEST_DESCRIPTOR);
		super.getOptionDescriptors(appendHere);
	}

	@Override
	protected void handleOption(Option option) throws Exception {
		if (option.is(TEST_DESCRIPTOR))
			test = true;
		else
			super.handleOption(option);
	}

	@Override
	protected void handleUnparsed(String[] unparsed) throws Exception {
		int len = unparsed.length;
		if (len > 1)
			throw new SimpleErrorExitException(Messages.Too_many_arguments);
		if (len == 1)
			pattern = unparsed[0];
	}

	@Override
	protected int run(IProgressMonitor monitor) throws Exception {
		PrintStream out = System.out;
		List<BasicPreferenceHandler> handlers = PreferenceMappingManager.getInstance(test).getAllHandlers(pattern);
		int top = handlers.size();
		if (top == 0) {
			out.print(Messages.No_preferences_found);
			if (pattern != null)
				out.format(NLS.bind(Messages.Is_the_pattern_0_correct, pattern));
			out.println();
			return 0;
		}

		out.print(Messages.Found);
		out.print(top);
		out.println(Messages.Preferences);
		for (int idx = 0; idx < top; ++idx) {
			BasicPreferenceHandler bph = handlers.get(idx);
			out.println(bph.getName());
			if (bph.getDescription() != null) {
				out.print(Messages.Description);
				out.println(bph.getDescription());
			}
			if (bph.getKey() != null) {
				out.print(Messages.Key);
				out.println(bph.getKey());
			}
			String v;
			try {
				v = bph.get(null);
			} catch (CoreException e) {
				v = NLS.bind(Messages.Unable_to_obtain_value_0, e.getMessage());
			}
			if (v == null)
				out.println(Messages.No_value_set);
			else {
				out.print(Messages.Value);
				out.println(v);
			}
		}
		return 0;
	}
}