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/*
* Copyright (c) 2009, Steve Ratcliffe
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 3 as
* published by the Free Software Foundation.
*
* 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.
*/
package uk.me.parabola.splitter.parser;
import org.xmlpull.v1.XmlPullParserException;
import uk.me.parabola.splitter.Area;
import uk.me.parabola.splitter.Convert;
import uk.me.parabola.splitter.MapProcessor;
import uk.me.parabola.splitter.Node;
import uk.me.parabola.splitter.OsmBounds;
import uk.me.parabola.splitter.Relation;
import uk.me.parabola.splitter.Utils;
import uk.me.parabola.splitter.Way;
import uk.me.parabola.splitter.xml.parser.AbstractXppParser;
/**
* Parses an OSM file, calling the appropriate methods on a
* {@code MapProcessor} as it progresses.
*/
public class OSMXMLParser
extends AbstractXppParser
{
private enum State {
Node, Way,
Relation, None
}
private Node currentNode =
new Node();
private Way currentWay =
new Way
();
private Relation currentRelation =
new Relation();
private final MapProcessor processor
;
// for status messages
private final ElementCounter elemCounter =
new ElementCounter
();
// There are mixed nodes and ways in the file
private final boolean mixed
;
private boolean skipTags
;
private boolean skipNodes
;
private boolean skipWays
;
private boolean skipRels
;
private State state =
State.
None;
public OSMXMLParser
(MapProcessor processor,
boolean mixed
) throws XmlPullParserException
{
this.
processor = processor
;
this.
mixed = mixed
;
skipTags = processor.
skipTags();
skipNodes = processor.
skipNodes();
skipWays = processor.
skipWays();
skipRels = processor.
skipRels();
}
/**
* Receive notification of the start of an element.
*/
@
Override
public boolean startElement
(String name
) {
switch (state
) {
case None:
CharSequence action = getAttr
("action");
if (action
!=
null && action.
equals("delete"))
return false;
if (name.
equals("node")) {
startNode
();
} else if (name.
equals("way")) {
if (!skipWays
)
startWay
();
else if (!mixed
&& skipRels
)
return true;
} else if (name.
equals("relation")) {
if (!skipRels
)
startRelation
();
else if (!mixed
)
return true;
} else if (name.
equals("bounds") || name.
equals("bound")) {
processBounds
();
}
break;
case Node:
if (!skipNodes
)
processNode
(name
);
break;
case Way:
if (!skipWays
)
processWay
(name
);
break;
case Relation:
if (!skipRels
)
processRelation
(name
);
break;
}
return false;
}
private void startNode
() {
String idStr = getAttr
("id");
String latStr = getAttr
("lat");
String lonStr = getAttr
("lon");
if (idStr ==
null || latStr ==
null || lonStr ==
null) {
// This should never happen - bad/corrupt .osm file?
System.
err.
println("Node encountered with missing data. Bad/corrupt osm file? id=" + idStr +
", lat=" + latStr +
", lon=" + lonStr +
". Ignoring this node");
return;
}
long id =
Long.
parseLong(idStr
);
double lat = Convert.
parseDouble(latStr
);
double lon = Convert.
parseDouble(lonStr
);
currentNode =
new Node();
currentNode.
set(id, lat, lon
);
currentNode.
setVersion(parseVersion
());
state =
State.
Node;
}
private void startWay
() {
currentWay =
new Way
();
currentWay.
setId(getLongAttr
("id"));
currentWay.
setVersion(parseVersion
());
state =
State.
Way;
}
private void startRelation
() {
currentRelation =
new Relation();
currentRelation.
setId(getLongAttr
("id"));
currentRelation.
setVersion(parseVersion
());
state =
State.
Relation;
}
private int parseVersion
() {
String versionStr = getAttr
("version");
if (versionStr ==
null)
return 0;
return Integer.
parseInt(versionStr
);
}
private void processNode
(CharSequence name
) {
if (name.
equals("tag")) {
if (!skipTags
)
currentNode.
addTag(getAttr
("k"), getAttr
("v"));
}
}
private void processWay
(CharSequence name
) {
if (name.
equals("nd")) {
currentWay.
addRef(getLongAttr
("ref"));
} else if (name.
equals("tag")) {
if (!skipTags
)
currentWay.
addTag(getAttr
("k"), getAttr
("v"));
}
}
private void processRelation
(CharSequence name
) {
if (name.
equals("tag")) {
if (!skipTags
)
currentRelation.
addTag(getAttr
("k"), getAttr
("v"));
} else if (name.
equals("member")) {
String type = getAttr
("type");
long id = getLongAttr
("ref");
String role = getAttr
("role");
if (role ==
null)
role =
"";
if ("node".
equals(type
))
currentRelation.
addMember("node", id, role
);
else if ("way".
equals(type
))
currentRelation.
addMember("way", id, role
);
else if ("relation".
equals(type
)) {
currentRelation.
addMember("relation", id, role
);
}
}
}
private static final String[] BOUND_ATTRS =
{"minlat",
"minlon",
"maxlat",
"maxlon"};
private void processBounds
() {
String[] split
;
String boxStr = getAttr
("box");
if (boxStr ==
null) {
split =
new String[4];
for (int i =
0; i
< BOUND_ATTRS.
length; i++
) {
split
[i
] = getAttr
(BOUND_ATTRS
[i
]);
if (split
[i
] ==
null) {
System.
err.
println("A <bounds/> tag was found but it has no 'box' attribute and no '" + BOUND_ATTRS
[i
] +
"' attribute. Ignoring bounds");
return;
}
}
} else {
split = boxStr.
split(",");
if (split.
length !=
4) {
System.
err.
println(
"A <bounds/> tag was found but its 'box' attribute contains an unexpected number of coordinates (expected 4, found " + split.
length +
"). Ignoring bounds");
return;
}
}
double[] coords =
new double[4];
for (int i =
0; i
< 4; i++
) {
try {
coords
[i
] =
Double.
parseDouble(split
[i
].
trim());
} catch (NumberFormatException e
) {
System.
err.
println("A <bounds/> tag was found but it contains unexpected data. Unable to parse '" + split
[i
] +
"' as a double. Ignoring bounds");
return;
}
}
OsmBounds osmBounds =
new OsmBounds
(coords
[0], coords
[1], coords
[2], coords
[3]);
Area bounds = osmBounds.
toArea();
if (!bounds.
verify())
throw new IllegalArgumentException("invalid bbox area in osm file: " + bounds
);
if (bounds.
getMinLong() > bounds.
getMaxLong()) {
System.
out.
println("A <bounds/> tag was found but it crosses +/-180 the latitude line (western edge=" +
Utils.
toDegrees(bounds.
getMinLong()) +
", eastern=" + Utils.
toDegrees(bounds.
getMaxLong()) +
"). The splitter isn't currently able to deal with this, so the bounds are being ignored");
return;
}
processor.
boundTag(osmBounds
);
System.
out.
println("A <bounds/> tag was found. Area covered is " + bounds.
toString());
}
/**
* Receive notification of the end of an element.
*/
@
Override
public void endElement
(String name
) {
if (state ==
State.
Node) {
if (name.
equals("node")) {
if (!skipNodes
)
processor.
processNode(currentNode
);
state =
State.
None;
elemCounter.
countNode(currentNode.
getId());
}
} else if (state ==
State.
Way) {
if (name.
equals("way")) {
if (!skipWays
)
processor.
processWay(currentWay
);
state =
State.
None;
elemCounter.
countWay(currentWay.
getId());
}
} else if (state ==
State.
Relation) {
if (name.
equals("relation")) {
if (!skipRels
)
processor.
processRelation(currentRelation
);
state =
State.
None;
elemCounter.
countRelation(currentRelation.
getId());
}
}
}
}