/*
* #%L
* JavaHg
* %%
* Copyright (C) 2011 aragost Trifork ag
* %%
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
* #L%
*/
package com.aragost.javahg.commands;
import java.io.IOException;
import com.aragost.javahg.Repository;
import com.aragost.javahg.commands.flags.VersionCommandFlags;
import com.aragost.javahg.internals.UnexpectedCommandOutputException;
/**
* Command class for executing <tt>hg version</tt>. Set flags from
* {@link VersionCommandFlags} and call the {@link #execute} method.
*/
public class VersionCommand extends VersionCommandFlags {
private static final String PREFIX = "Mercurial Distributed SCM (version ";
/**
* @param repository
* the repository associated with this command.
*/
public VersionCommand(Repository repository) {
super(repository);
}
/**
* Retrieve the Mercurial version number.
*
* @return the Mercurial version of the command server. This is a
* string since it can include extra information such as
* the exact changeset ID used to build Mercurial.
* @throws IOException
*/
public String execute() {
String s = launchString();
if (s.startsWith(PREFIX)) {
s = s.substring(PREFIX.length());
int n = s.indexOf(')');
return new String(s.substring(0, n));
} else {
throw new UnexpectedCommandOutputException(this, s);
}
}
}