    001// Copyright 2006, 2007 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.tapestry5.ioc.internal.util;
    016
    017import java.util.Formatter;
    018
    019import org.apache.tapestry5.commons.Location;
    020import org.apache.tapestry5.commons.Resource;
    021
    022/**
    023 * Implementation class for {@link org.apache.tapestry5.commons.Location}.
    024 */
    025public final class LocationImpl implements Location
    026{
    027    private final Resource resource;
    028
    029    private final int line;
    030
    031    private final int column;
    032
    033    private static final int UNKNOWN = -1;
    034
    035    public LocationImpl(Resource resource)
    036    {
    037        this(resource, UNKNOWN);
    038    }
    039
    040    public LocationImpl(Resource resource, int line)
    041    {
    042        this(resource, line, UNKNOWN);
    043    }
    044
    045    public LocationImpl(Resource resource, int line, int column)
    046    {
    047        this.resource = resource;
    048        this.line = line;
    049        this.column = column;
    050    }
    051
    052    @Override
    053    public Resource getResource()
    054    {
    055        return resource;
    056    }
    057
    058    @Override
    059    public int getLine()
    060    {
    061        return line;
    062    }
    063
    064    @Override
    065    public int getColumn()
    066    {
    067        return column;
    068    }
    069
    070    @Override
    071    public String toString()
    072    {
    073        StringBuilder buffer = new StringBuilder(resource.toString());
    074        Formatter formatter = new Formatter(buffer);
    075
    076        if (line != UNKNOWN) formatter.format(", line %d", line);
    077
    078        if (column != UNKNOWN) formatter.format(", column %d", column);
    079
    080        return buffer.toString();
    081    }
    082
    083    @Override
    084    public int hashCode()
    085    {
    086        final int PRIME = 31;
    087        int result = 1;
    088        result = PRIME * result + column;
    089        result = PRIME * result + line;
    090        result = PRIME * result + ((resource == null) ? 0 : resource.hashCode());
    091        return result;
    092    }
    093
    094    @Override
    095    public boolean equals(Object obj)
    096    {
    097        if (this == obj) return true;
    098        if (obj == null) return false;
    099        if (getClass() != obj.getClass()) return false;
    100        final LocationImpl other = (LocationImpl) obj;
    101        if (column != other.column) return false;
    102        if (line != other.line) return false;
    103        if (resource == null)
    104        {
    105            if (other.resource != null) return false;
    106        }
    107        else if (!resource.equals(other.resource)) return false;
    108        return true;
    109    }
    110
    111}