/*
 * Copyright (C) 2011, Christoph Brill <egore911@egore911.de>
 * and other copyright owners as documented in the project's IP log.
 *
 * This program and the accompanying materials are made available
 * under the terms of the Eclipse Distribution License v1.0 which
 * accompanies this distribution, is reproduced below, and is
 * available at http://www.eclipse.org/org/documents/edl-v10.php
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or
 * without modification, are permitted provided that the following
 * conditions are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 *
 * - Redistributions in binary form must reproduce the above
 *   copyright notice, this list of conditions and the following
 *   disclaimer in the documentation and/or other materials provided
 *   with the distribution.
 *
 * - Neither the name of the Eclipse Foundation, Inc. nor the
 *   names of its contributors may be used to endorse or promote
 *   products derived from this software without specific prior
 *   written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
 * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package org.eclipse.jgit.api;

import java.net.URISyntaxException;
import java.text.MessageFormat;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;

import org.eclipse.jgit.api.errors.GitAPIException;
import org.eclipse.jgit.api.errors.InvalidRemoteException;
import org.eclipse.jgit.api.errors.JGitInternalException;
import org.eclipse.jgit.errors.NotSupportedException;
import org.eclipse.jgit.errors.TransportException;
import org.eclipse.jgit.internal.JGitText;
import org.eclipse.jgit.lib.Constants;
import org.eclipse.jgit.lib.Ref;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.transport.FetchConnection;
import org.eclipse.jgit.transport.RefSpec;
import org.eclipse.jgit.transport.Transport;
import org.eclipse.jgit.transport.URIish;

The ls-remote command
See Also:
Git documentation about ls-remote/**
 * The ls-remote command
 *
 * @see <a
 *      href="http://www.kernel.org/pub/software/scm/git/docs/git-ls-remote.html"
 *      >Git documentation about ls-remote</a>
 */
public class LsRemoteCommand extends
		TransportCommand<LsRemoteCommand, Collection<Ref>> {

	private String remote = Constants.DEFAULT_REMOTE_NAME;

	private boolean heads;

	private boolean tags;

	private String uploadPack;

	
Constructor for LsRemoteCommand
Params:
repo – 
           local repository or null for operation without local
           repository/**
	 * Constructor for LsRemoteCommand
	 *
	 * @param repo
	 *            local repository or null for operation without local
	 *            repository
	 */
	public LsRemoteCommand(Repository repo) {
		super(repo);
	}

	
The remote (uri or name) used for the fetch operation. If no remote is
set, the default value of Constants.DEFAULT_REMOTE_NAME will
be used.
Params:
remote –  a String object.
See Also:
DEFAULT_REMOTE_NAME.DEFAULT_REMOTE_NAME
Returns:
this/**
	 * The remote (uri or name) used for the fetch operation. If no remote is
	 * set, the default value of <code>Constants.DEFAULT_REMOTE_NAME</code> will
	 * be used.
	 *
	 * @see Constants#DEFAULT_REMOTE_NAME
	 * @param remote
	 *            a {@link java.lang.String} object.
	 * @return {@code this}
	 */
	public LsRemoteCommand setRemote(String remote) {
		checkCallable();
		this.remote = remote;
		return this;
	}

	
Include refs/heads in references results
Params:
heads – 
           whether to include refs/heads
Returns:
this/**
	 * Include refs/heads in references results
	 *
	 * @param heads
	 *            whether to include refs/heads
	 * @return {@code this}
	 */
	public LsRemoteCommand setHeads(boolean heads) {
		this.heads = heads;
		return this;
	}

	
Include refs/tags in references results
Params:
tags – 
           whether to include tags
Returns:
this/**
	 * Include refs/tags in references results
	 *
	 * @param tags
	 *            whether to include tags
	 * @return {@code this}
	 */
	public LsRemoteCommand setTags(boolean tags) {
		this.tags = tags;
		return this;
	}

	
The full path of git-upload-pack on the remote host
Params:
uploadPack – 
           the full path of executable providing the git-upload-pack
           service on remote host
Returns:
this/**
	 * The full path of git-upload-pack on the remote host
	 *
	 * @param uploadPack
	 *            the full path of executable providing the git-upload-pack
	 *            service on remote host
	 * @return {@code this}
	 */
	public LsRemoteCommand setUploadPack(String uploadPack) {
		this.uploadPack = uploadPack;
		return this;
	}

	
{@inheritDoc}
 Execute the LsRemote command with all the options and parameters collected by the setter methods (e.g. setHeads(boolean)) of this class. Each instance of this class should only be used for one invocation of the command. Don't call this method twice on an instance. /**
	 * {@inheritDoc}
	 * <p>
	 * Execute the {@code LsRemote} command with all the options and parameters
	 * collected by the setter methods (e.g. {@link #setHeads(boolean)}) of this
	 * class. Each instance of this class should only be used for one invocation
	 * of the command. Don't call this method twice on an instance.
	 */
	@Override
	public Collection<Ref> call() throws GitAPIException,
			InvalidRemoteException,
			org.eclipse.jgit.api.errors.TransportException {
		return execute().values();
	}

	
Same as call(), but return Map instead of Collection. 
Throws:
GitAPIException – 
            or subclass thereof when an error occurs
InvalidRemoteException – 
            when called with an invalid remote uri
TransportException – 
            for errors that occurs during transport
Returns:
a map from names to references in the remote repository
Since:
3.5/**
	 * Same as {@link #call()}, but return Map instead of Collection.
	 *
	 * @return a map from names to references in the remote repository
	 * @throws org.eclipse.jgit.api.errors.GitAPIException
	 *             or subclass thereof when an error occurs
	 * @throws org.eclipse.jgit.api.errors.InvalidRemoteException
	 *             when called with an invalid remote uri
	 * @throws org.eclipse.jgit.api.errors.TransportException
	 *             for errors that occurs during transport
	 * @since 3.5
	 */
	public Map<String, Ref> callAsMap() throws GitAPIException,
			InvalidRemoteException,
			org.eclipse.jgit.api.errors.TransportException {
		return Collections.unmodifiableMap(execute());
	}

	private Map<String, Ref> execute() throws GitAPIException,
			InvalidRemoteException,
			org.eclipse.jgit.api.errors.TransportException {
		checkCallable();

		try (Transport transport = repo != null
				? Transport.open(repo, remote)
				: Transport.open(new URIish(remote))) {
			transport.setOptionUploadPack(uploadPack);
			configure(transport);
			Collection<RefSpec> refSpecs = new ArrayList<>(1);
			if (tags)
				refSpecs.add(new RefSpec(
						"refs/tags/*:refs/remotes/origin/tags/*")); //$NON-NLS-1$
			if (heads)
				refSpecs.add(new RefSpec("refs/heads/*:refs/remotes/origin/*")); //$NON-NLS-1$
			Collection<Ref> refs;
			Map<String, Ref> refmap = new HashMap<>();
			try (FetchConnection fc = transport.openFetch()) {
				refs = fc.getRefs();
				if (refSpecs.isEmpty())
					for (Ref r : refs)
						refmap.put(r.getName(), r);
				else
					for (Ref r : refs)
						for (RefSpec rs : refSpecs)
							if (rs.matchSource(r)) {
								refmap.put(r.getName(), r);
								break;
							}
				return refmap;
			}
		} catch (URISyntaxException e) {
			throw new InvalidRemoteException(MessageFormat.format(
					JGitText.get().invalidRemote, remote));
		} catch (NotSupportedException e) {
			throw new JGitInternalException(
					JGitText.get().exceptionCaughtDuringExecutionOfLsRemoteCommand,
					e);
		} catch (TransportException e) {
			throw new org.eclipse.jgit.api.errors.TransportException(
					e.getMessage(),
					e);
		}
	}

}