org.jfxvnc.net.rfb.codec.ProtocolVersion Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of jfxvnc-net Show documentation
RFB/VNC protocol codec and handler based on netty
There is a newer version: 1.2.0
package org.jfxvnc.net.rfb.codec;

/*
 * #%L
 * RFB protocol
 * %%
 * Copyright (C) 2015 comtel2000
 * %%
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * #L%
 */

import java.nio.charset.StandardCharsets;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class ProtocolVersion implements Comparable {

    public final static ProtocolVersion RFB_3_3 = new ProtocolVersion(3, 3);
    public final static ProtocolVersion RFB_3_7 = new ProtocolVersion(3, 7);
    public final static ProtocolVersion RFB_3_8 = new ProtocolVersion(3, 8);

    private final Pattern VERSION_PAT = Pattern.compile("RFB ([0-9]{3}).([0-9]{3})");

    private int majorVersion;

    private int minorVersion;

    /**
     * RFB protocol parser (RFB ([0-9]{3}).([0-9]{3}))
     * 
     * @param version
     *            String
     */
    public ProtocolVersion(String version) {
	if (version == null) {
	    throw new IllegalArgumentException("null can not parsed to version");
	}
	Matcher versionMatcher = VERSION_PAT.matcher(version);
	if (versionMatcher.find()) {
	    majorVersion = Integer.parseInt(versionMatcher.group(1));
	    minorVersion = Integer.parseInt(versionMatcher.group(2));
	} else {
	    throw new IllegalArgumentException("version: " + version + " not supported");
	}
    }

    public ProtocolVersion(int major, int minor) {
	majorVersion = major;
	minorVersion = minor;
    }

    public int getMajorVersion() {
	return majorVersion;
    }

    public int getMinorVersion() {
	return minorVersion;
    }

    public boolean isGreaterThan(ProtocolVersion o) {
	return compareTo(o) > 0;
    }

    public boolean isGreaterThan(String v) {
	return compareTo(new ProtocolVersion(v)) > 0;
    }

    @Override
    public boolean equals(Object obj) {
	if (obj == null || !(obj instanceof ProtocolVersion)) {
	    return false;
	}
	return compareTo((ProtocolVersion) obj) == 0;
    }

    @Override
    public int compareTo(ProtocolVersion v) {
	if (majorVersion == v.getMajorVersion() && minorVersion == v.getMinorVersion()) {
	    return 0;
	}
	if (majorVersion > v.getMajorVersion() || (majorVersion == v.getMajorVersion() && minorVersion > v.getMinorVersion())) {
	    return 1;
	}
	return -1;
    }

    /**
     * encoded ASCII bytes include LF
     * 
     * @return expected RFB version bytes
     */
    public byte[] getBytes() {
	return String.format("RFB %03d.%03d\n", majorVersion, minorVersion).getBytes(StandardCharsets.US_ASCII);
    }

    @Override
    public String toString() {
	return String.format("RFB %03d.%03d", majorVersion, minorVersion);
    }
}