001// Copyright 2004, 2005 The Apache Software Foundation
002//
003// Licensed under the Apache License, Version 2.0 (the "License");
004// you may not use this file except in compliance with the License.
005// You may obtain a copy of the License at
006//
007//     http://www.apache.org/licenses/LICENSE-2.0
008//
009// Unless required by applicable law or agreed to in writing, software
010// distributed under the License is distributed on an "AS IS" BASIS,
011// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012// See the License for the specific language governing permissions and
013// limitations under the License.
014
015package org.apache.hivemind.impl;
016
017import org.apache.hivemind.Location;
018import org.apache.hivemind.Resource;
019
020/**
021 * Implementation of the {@link org.apache.hivemind.Location} interface.
022 *
023 * @author Howard Lewis Ship
024 */
025public final class LocationImpl implements Location
026{
027    private Resource _resource;
028    private int _lineNumber = -1;
029    private int _columnNumber = -1;
030
031    public LocationImpl(Resource resource)
032    {
033        _resource = resource;
034    }
035
036    public LocationImpl(Resource resource, int lineNumber)
037    {
038        this(resource);
039
040        _lineNumber = lineNumber;
041    }
042
043    public LocationImpl(Resource resource, int lineNumber, int columnNumber)
044    {
045        this(resource);
046
047        _lineNumber = lineNumber;
048        _columnNumber = columnNumber;
049    }
050
051    public Resource getResource()
052    {
053        return _resource;
054    }
055
056    public int getLineNumber()
057    {
058        return _lineNumber;
059    }
060
061    public int getColumnNumber()
062    {
063        return _columnNumber;
064    }
065
066    public int hashCode()
067    {
068        return ((237 + _resource.hashCode()) << 3 + _lineNumber) << 3 + _columnNumber;
069    }
070
071    public boolean equals(Object other)
072    {
073        if (!(other instanceof Location))
074            return false;
075
076        Location l = (Location) other;
077
078        if (_lineNumber != l.getLineNumber())
079            return false;
080
081        if (_columnNumber != l.getColumnNumber())
082            return false;
083
084        return _resource.equals(l.getResource());
085    }
086
087    public String toString()
088    {
089        if (_lineNumber <= 0 && _columnNumber <= 0)
090            return _resource.toString();
091
092        StringBuffer buffer = new StringBuffer(_resource.toString());
093
094        if (_lineNumber > 0)
095        {
096            buffer.append(", line ");
097            buffer.append(_lineNumber);
098        }
099
100        if (_columnNumber > 0)
101        {
102            buffer.append(", column ");
103            buffer.append(_columnNumber);
104        }
105
106        return buffer.toString();
107    }
108}