org.eclim.plugin.core.command.admin.PingCommand.java Source code

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Here is the source code for org.eclim.plugin.core.command.admin.PingCommand.java

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/**
 * Copyright (C) 2005 - 2009  Eric Van Dewoestine
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.eclim.plugin.core.command.admin;

import java.util.ArrayList;
import java.util.Collections;

import org.apache.commons.lang.StringUtils;

import org.eclim.Services;

import org.eclim.annotation.Command;

import org.eclim.command.CommandLine;

import org.eclim.plugin.PluginResources;

import org.eclim.plugin.core.command.AbstractCommand;

import org.eclipse.core.runtime.Platform;

import org.osgi.framework.Bundle;

/**
 * Command which responds to ping requests, returning the eclim and eclipse
 * version numbers.
 *
 * @author Eric Van Dewoestine
 */
@Command(name = "ping")
public class PingCommand extends AbstractCommand {
    private String version;

    /**
     * {@inheritDoc}
     */
    public String execute(CommandLine commandLine) throws Exception {
        if (version == null) {
            PluginResources resources = Services.getPluginResources("org.eclim");
            String eclim_name = "eclim";
            String eclipse_name = "eclipse";
            int pad = Math.max(eclim_name.length(), eclipse_name.length());

            String eclim_version = StringUtils.rightPad(eclim_name, pad) + ' '
                    + resources.getProperty("pluginVersion");

            String eclipse_version = getVersion();
            eclipse_version = StringUtils.rightPad(eclipse_name, pad) + ' ' + eclipse_version;

            version = eclim_version + '\n' + eclipse_version;
        }

        return version;
    }

    private String getVersion() {
        // I can't find a way to get a definitive eclipse version number, so try
        // comparing the version numbers of some bundles and take the highest one as
        // the current version.
        ArrayList<String> versions = new ArrayList<String>();
        String[] names = { "org.eclipse.osgi", "org.eclipse.swt" };
        for (String name : names) {
            String version = getVersion(name);
            if (version != null) {
                versions.add(version);
            }
        }
        Collections.sort(versions);
        return versions.get(versions.size() - 1);
    }

    private String getVersion(String bundleName) {
        Bundle bundle = Platform.getBundle(bundleName);
        if (bundle != null) {
            String eclipse_version = (String) bundle.getHeaders().get("Bundle-Version");
            if (eclipse_version != null) {
                eclipse_version = eclipse_version.replaceFirst("([0-9.]+).*", "$1");
                return eclipse_version.replaceFirst("\\.$", "");
            }
        }
        return null;
    }
}