155 lines
3.8 KiB
Java
155 lines
3.8 KiB
Java
/**
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* Container for link between two Osm nodes
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*
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* @author ab
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*/
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package btools.mapaccess;
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public class OsmLink {
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/**
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* The description bitmap contains the waytags (valid for both directions)
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*/
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public byte[] descriptionBitmap;
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/**
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* The geometry contains intermediate nodes, null for none (valid for both directions)
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*/
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public byte[] geometry;
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// a link logically knows only its target, but for the reverse link, source and target are swapped
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protected OsmNode n1;
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protected OsmNode n2;
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// same for the next-link-for-node pointer: previous applies to the reverse link
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protected OsmLink previous;
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protected OsmLink next;
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private OsmLinkHolder reverselinkholder = null;
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private OsmLinkHolder firstlinkholder = null;
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protected OsmLink() {
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}
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public OsmLink(OsmNode source, OsmNode target) {
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n1 = source;
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n2 = target;
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}
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/**
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* Get the relevant target-node for the given source
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*/
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public final OsmNode getTarget(OsmNode source) {
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return n2 != source && n2 != null ? n2 : n1;
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/* if ( n2 != null && n2 != source )
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{
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return n2;
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}
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else if ( n1 != null && n1 != source )
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{
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return n1;
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}
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else
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{
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new Throwable( "ups" ).printStackTrace();
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throw new IllegalArgumentException( "internal error: getTarget: unknown source; " + source + " n1=" + n1 + " n2=" + n2 );
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} */
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}
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/**
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* Get the relevant next-pointer for the given source
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*/
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public final OsmLink getNext(OsmNode source) {
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return n2 != source && n2 != null ? next : previous;
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/* if ( n2 != null && n2 != source )
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{
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return next;
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}
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else if ( n1 != null && n1 != source )
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{
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return previous;
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}
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else
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{
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throw new IllegalArgumentException( "internal error: gextNext: unknown source" );
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} */
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}
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/**
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* Reset this link for the given direction
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*/
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protected final OsmLink clear(OsmNode source) {
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OsmLink n;
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if (n2 != null && n2 != source) {
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n = next;
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next = null;
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n2 = null;
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firstlinkholder = null;
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} else if (n1 != null && n1 != source) {
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n = previous;
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previous = null;
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n1 = null;
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reverselinkholder = null;
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} else {
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throw new IllegalArgumentException("internal error: setNext: unknown source");
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}
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if (n1 == null && n2 == null) {
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descriptionBitmap = null;
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geometry = null;
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}
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return n;
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}
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public final void setFirstLinkHolder(OsmLinkHolder holder, OsmNode source) {
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if (n2 != null && n2 != source) {
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firstlinkholder = holder;
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} else if (n1 != null && n1 != source) {
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reverselinkholder = holder;
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} else {
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throw new IllegalArgumentException("internal error: setFirstLinkHolder: unknown source");
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}
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}
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public final OsmLinkHolder getFirstLinkHolder(OsmNode source) {
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if (n2 != null && n2 != source) {
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return firstlinkholder;
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} else if (n1 != null && n1 != source) {
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return reverselinkholder;
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} else {
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throw new IllegalArgumentException("internal error: getFirstLinkHolder: unknown source");
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}
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}
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public final boolean isReverse(OsmNode source) {
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return n1 != source && n1 != null;
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/* if ( n2 != null && n2 != source )
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{
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return false;
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}
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else if ( n1 != null && n1 != source )
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{
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return true;
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}
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else
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{
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throw new IllegalArgumentException( "internal error: isReverse: unknown source" );
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} */
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}
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public final boolean isBidirectional() {
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return n1 != null && n2 != null;
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}
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public final boolean isLinkUnused() {
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return n1 == null && n2 == null;
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}
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public final void addLinkHolder(OsmLinkHolder holder, OsmNode source) {
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OsmLinkHolder firstHolder = getFirstLinkHolder(source);
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if (firstHolder != null) {
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holder.setNextForLink(firstHolder);
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}
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setFirstLinkHolder(holder, source);
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}
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}
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