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Jetty example source code file (ChannelId.java)

This example Jetty source code file (ChannelId.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Jetty tags/keywords

channelid, channelid, illegalargumentexception, illegalargumentexception, root, string, string, wild, wildwild, wildwild

The Jetty ChannelId.java source code

// ========================================================================
// Copyright 2007 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// 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.
//========================================================================

package org.mortbay.cometd;




public class ChannelId
{
    public final static String WILD="*";
    public final static String WILDWILD="**";
    
    private static final String[] ROOT = {};
    String _name;
    String[] _segments;
    int _wild;
    
    public ChannelId(String name)
    {
        _name=name;
        if (name==null || name.length()==0 || name.charAt(0)!='/')
            throw new IllegalArgumentException(name);
        
        if ("/".equals(name))
        {
            _segments=ROOT;
        }
        else
        {
            if (name.charAt(name.length()-1)=='/')
                throw new IllegalArgumentException(name);
                
            _segments=name.substring(1).split("/");
        }
        
        if (_segments.length==0)
            _wild=0;
        else if (WILD.equals(_segments[_segments.length-1]))
            _wild=1;
        else if (WILDWILD.equals(_segments[_segments.length-1]))
            _wild=2;
    }
    
    public boolean isWild()
    {
        return _wild>0;
    }
    
    public boolean equals(Object obj)
    {
        if (this==obj)
            return true;
        
        if (obj instanceof ChannelId)
        {
            ChannelId other=(ChannelId)obj;
            if (isWild())
            {
                if (other.isWild())
                    return _name.equals(other._name);
                return matches(other);
            }
            else
            {
                if (other.isWild())
                    return other.matches(this);
                return _name.equals(other._name);
            }
        }
        else if (obj instanceof String)
        {
            if (isWild())
                return matches((String)obj);
            return _name.equals(obj);
        }
            
        return false;
    }

    public boolean matches(ChannelId name)
    {
        if (name.isWild())
            return equals(name);
        
        switch(_wild)
        {
            case 0:
                return equals(name);
            case 1:
                if (name._segments.length!=_segments.length)
                    return false;
                for (int i=_segments.length-1;i-->0;)
                    if (!_segments[i].equals(name._segments[i]))
                        return false;
                return true;
                
            case 2:
                if (name._segments.length<_segments.length)
                    return false;
                for (int i=_segments.length-1;i-->0;)
                    if (!_segments[i].equals(name._segments[i]))
                        return false;
                return true;
        }
        return false;
    }

    public boolean matches(String name)
    {
        if (_wild==0)
            return _name.equals(name);
        
        // TODO more efficient?
        return matches(new ChannelId(name));
    }
    
    public int hashCode()
    {
        return _name.hashCode();
    }

    public String toString()
    {
        return _name;
    }
    
    public int depth()
    {
        return _segments.length;
    }

    public boolean isParentOf(ChannelId id)
    {
        if (isWild() || depth()>=id.depth())
            return false;

        for (int i=_segments.length-1;i-->0;)
            if (!_segments[i].equals(id._segments[i]))
                return false;
        
        return true;
    }

    public String getSegment(int i)
    {
        if (i>_segments.length)
            return null;
        return _segments[i];
    }
}

Other Jetty examples (source code examples)

Here is a short list of links related to this Jetty ChannelId.java source code file:

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