com.revolsys.jts.linearref

Class LinearIterator

java.lang.Object

com.revolsys.jts.linearref.LinearIterator

public class LinearIterator
extends Object

An iterator over the components and coordinates of a linear geometry (LineStrings and MultiLineStrings. The standard usage pattern for a LinearIterator is:

 for (LinearIterator it = new LinearIterator(...); it.hasNext(); it.next()) {
   ...
   int ci = it.getComponentIndex();   // for example
   int vi = it.getVertexIndex();      // for example
   ...
 }
 

Version:

1.7

Constructor Summary

Constructors

Constructor and Description
LinearIterator(Geometry linear) Creates an iterator initialized to the start of a linear Geometry
LinearIterator(Geometry linearGeom, int componentIndex, int vertexIndex) Creates an iterator starting at a specified component and vertex in a linear Geometry
LinearIterator(Geometry linear, LinearLocation start) Creates an iterator starting at a LinearLocation on a linear Geometry

Method Summary

Methods

Modifier and Type	Method and Description
int	getComponentIndex() The component index of the vertex the iterator is currently at.
LineString	getLine() Gets the LineString component the iterator is current at.
Point	getSegmentEnd() Gets the second Coordinates of the current segment.
Point	getSegmentStart() Gets the first Coordinates of the current segment.
int	getVertexIndex() The vertex index of the vertex the iterator is currently at.
boolean	hasNext() Tests whether there are any vertices left to iterator over.
boolean	isEndOfLine() Checks whether the iterator cursor is pointing to the endpoint of a component LineString.
void	next() Moves the iterator ahead to the next vertex and (possibly) linear component.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

LinearIterator

public LinearIterator(Geometry linear)

Creates an iterator initialized to the start of a linear Geometry

Parameters:

linear - the linear geometry to iterate over

Throws:

IllegalArgumentException - if linearGeom is not lineal

LinearIterator

public LinearIterator(Geometry linearGeom,
              int componentIndex,
              int vertexIndex)

Creates an iterator starting at a specified component and vertex in a linear Geometry

Parameters:

linearGeom - the linear geometry to iterate over

componentIndex - the component to start at

vertexIndex - the vertex to start at

Throws:

IllegalArgumentException - if linearGeom is not lineal

LinearIterator

public LinearIterator(Geometry linear,
              LinearLocation start)

Creates an iterator starting at a LinearLocation on a linear Geometry

Parameters:

linear - the linear geometry to iterate over

start - the location to start at

Throws:

IllegalArgumentException - if linearGeom is not lineal

Method Detail

getComponentIndex

public int getComponentIndex()

The component index of the vertex the iterator is currently at.

Returns:

the current component index

getLine

public LineString getLine()

Gets the LineString component the iterator is current at.

Returns:

a linestring

getSegmentEnd

public Point getSegmentEnd()

Gets the second Coordinates of the current segment. (the coordinate of the next vertex). If the iterator is at the end of a line, null is returned.

Returns:

a Coordinates or null

getSegmentStart

public Point getSegmentStart()

Gets the first Coordinates of the current segment. (the coordinate of the current vertex).

Returns:

a Coordinates

getVertexIndex

public int getVertexIndex()

The vertex index of the vertex the iterator is currently at.

Returns:

the current vertex index

hasNext

public boolean hasNext()

Tests whether there are any vertices left to iterator over. Specifically, hasNext() return true if the current state of the iterator represents a valid location on the linear geometry.

Returns:

true if there are more vertices to scan

isEndOfLine

public boolean isEndOfLine()

Checks whether the iterator cursor is pointing to the endpoint of a component LineString.

Returns:

true if the iterator is at an endpoint

next

public void next()

Moves the iterator ahead to the next vertex and (possibly) linear component.