java.lang.Object
- edu.uci.ics.jung.io.PajekNetReader<G,V,E>

```
public class PajekNetReader<G extends Graph<V,E>,V,E>
extends java.lang.Object
```
Reads a Graph from a Pajek NET formatted source.
If the edge constraints specify that the graph is strictly undirected, and an "*Arcs" section is encountered, or if the edge constraints specify that the graph is strictly directed, and an "*Edges" section is encountered, an IllegalArgumentException is thrown.
If the edge constraints do not permit parallel edges, only the first encountered of a set of parallel edges will be read; subsequent edges in that set will be ignored.
More restrictive edge constraints will cause vertices to be generated that are more time- and space-efficient. At the moment, only supports the part of the specification that defines:
- vertex ids (each must have a value from 1 to n, where n is the number of vertices)
- vertex labels (must be in quotes if interrupted by whitespace)
- directed edge connections (single or list)
- undirected edge connections (single or list)
- edge weights (not compatible with edges specified in list form)
  note: this version of PajekNetReader does not support multiple edge weights, as PajekNetFile does; this behavior is consistent with the NET format.
- vertex locations (x and y; z coordinate is ignored)
Here is an example format for a directed graph without edge weights and edges specified in list form:
```
 *vertices [# of vertices] 
 1 "a" 
 2 "b" 
 3 "c" 
 *arcslist 
 1 2 3 
 2 3  
 
```
Here is an example format for an undirected graph with edge weights and edges specified in non-list form:
```
 *vertices [# of vertices] 
 1 "a" 
 2 "b" 
 3 "c" 
 *edges 
 1 2 0.1 
 1 3 0.9 
 2 3 1.0 
 
```
See Also:

"'Pajek - Program for Analysis and Visualization of Large Networks', Vladimir Batagelj and Andrej Mrvar, http://vlado.fmf.uni-lj.si/pub/networks/pajek/doc/pajekman.pdf"

Nested Class Summary

Nested Classes
Modifier and Type	Class	Description
`protected static class`	`PajekNetReader.ListTagPred`	A Predicate which evaluates to `true` if the argument ends with the string "list".
`protected static class`	`PajekNetReader.StartsWithPredicate`	A Predicate which evaluates to `true` if the argument starts with the constructor-specified String.

Field Summary

Fields
Modifier and Type	Field	Description
`private static com.google.common.base.Predicate<java.lang.String>`	`a_pred`
`private static com.google.common.base.Predicate<java.lang.String>`	`c_pred`
`private static com.google.common.base.Predicate<java.lang.String>`	`e_pred`
`protected com.google.common.base.Supplier<E>`	`edge_factory`
`protected SettableTransformer<E,java.lang.Number>`	`edge_weights`
`protected static com.google.common.base.Predicate<java.lang.String>`	`l_pred`
`private static com.google.common.base.Predicate<java.lang.String>`	`t_pred`
`private static com.google.common.base.Predicate<java.lang.String>`	`v_pred`	Used to specify whether the most recently read line is a Pajek-specific tag.
`protected com.google.common.base.Supplier<V>`	`vertex_factory`
`protected SettableTransformer<V,java.lang.String>`	`vertex_labels`	The map for vertex labels (if any) created by this class.
`protected SettableTransformer<V,java.awt.geom.Point2D>`	`vertex_locations`	The map for vertex locations (if any) defined by this class.

Constructor Summary

Constructors
Constructor	Description
`PajekNetReader(com.google.common.base.Supplier<E> edge_factory)`	Creates a PajekNetReader instance with the specified edge Supplier, and whose vertex objects correspond to the integer IDs assigned in the file.
`PajekNetReader(com.google.common.base.Supplier<V> vertex_factory, com.google.common.base.Supplier<E> edge_factory)`	Creates a PajekNetReader instance with the specified vertex and edge factories.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`protected E`	`createAddEdge(java.util.StringTokenizer st, V v1, EdgeType directed, Graph<V,E> g, java.util.List<V> id, com.google.common.base.Supplier<E> edge_factory)`
`SettableTransformer<E,java.lang.Number>`	`getEdgeWeightTransformer()`
`SettableTransformer<V,java.lang.String>`	`getVertexLabeller()`
`SettableTransformer<V,java.awt.geom.Point2D>`	`getVertexLocationTransformer()`
`G`	`load(java.io.Reader reader, com.google.common.base.Supplier<? extends G> graph_factory)`	Returns the graph created by parsing the specified reader, as created by the specified Supplier.
`G`	`load(java.io.Reader reader, G g)`	Populates the graph `g` with the graph represented by the Pajek-format data supplied by `reader`.
`G`	`load(java.lang.String filename, com.google.common.base.Supplier<? extends G> graph_factory)`	Returns the graph created by parsing the specified file, as created by the specified Supplier.
`G`	`load(java.lang.String filename, G g)`	Returns the graph created by parsing the specified file, by populating the specified graph.
`private java.lang.String`	`readArcsOrEdges(java.lang.String curLine, java.io.BufferedReader br, Graph<V,E> g, java.util.List<V> id, com.google.common.base.Supplier<E> edge_factory)`
`private void`	`readVertex(java.lang.String curLine, java.util.List<V> id, int num_vertices)`	Parses `curLine` as a reference to a vertex, and optionally assigns label and location information.
`void`	`setEdgeWeightTransformer(SettableTransformer<E,java.lang.Number> edge_weights)`	Provides a Function which will be used to write out edge weights.
`void`	`setVertexLabeller(SettableTransformer<V,java.lang.String> vertex_labels)`	Provides a Function which will be used to write out the vertex labels.
`void`	`setVertexLocationTransformer(SettableTransformer<V,java.awt.geom.Point2D> vertex_locations)`	Provides a Function which will be used to write out the vertex locations.
`protected java.lang.String`	`skip(java.io.BufferedReader br, com.google.common.base.Predicate<java.lang.String> p)`	Returns the first line read from `br` for which `p` returns `true`, or `null` if there is no such line.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - vertex_factory
```
protected com.google.common.base.Supplier<V> vertex_factory
```
  - edge_factory
```
protected com.google.common.base.Supplier<E> edge_factory
```
  - vertex_labels
```
protected SettableTransformer<V,java.lang.String> vertex_labels
```
    The map for vertex labels (if any) created by this class.
  - vertex_locations
```
protected SettableTransformer<V,java.awt.geom.Point2D> vertex_locations
```
    The map for vertex locations (if any) defined by this class.
  - edge_weights
```
protected SettableTransformer<E,java.lang.Number> edge_weights
```
  - v_pred
```
private static final com.google.common.base.Predicate<java.lang.String> v_pred
```
    Used to specify whether the most recently read line is a Pajek-specific tag.
  - a_pred
```
private static final com.google.common.base.Predicate<java.lang.String> a_pred
```
  - e_pred
```
private static final com.google.common.base.Predicate<java.lang.String> e_pred
```
  - t_pred
```
private static final com.google.common.base.Predicate<java.lang.String> t_pred
```
  - c_pred
```
private static final com.google.common.base.Predicate<java.lang.String> c_pred
```
  - l_pred
```
protected static final com.google.common.base.Predicate<java.lang.String> l_pred
```
- Constructor Detail
  - PajekNetReader
```
public PajekNetReader(com.google.common.base.Supplier<V> vertex_factory,
                      com.google.common.base.Supplier<E> edge_factory)
```
    Creates a PajekNetReader instance with the specified vertex and edge factories.
    
    Parameters:
    
    vertex_factory - the Supplier to use to create vertex objects
    
    edge_factory - the Supplier to use to create edge objects
  - PajekNetReader
```
public PajekNetReader(com.google.common.base.Supplier<E> edge_factory)
```
    Creates a PajekNetReader instance with the specified edge Supplier, and whose vertex objects correspond to the integer IDs assigned in the file. Note that this requires V to be assignment-compatible with an Integer value.
    
    Parameters:
    
    edge_factory - the Supplier to use to create edge objects
- Method Detail
  - load
```
public G load(java.lang.String filename,
              com.google.common.base.Supplier<? extends G> graph_factory)
       throws java.io.IOException
```
    Returns the graph created by parsing the specified file, as created by the specified Supplier.
    
    Parameters:
    
    filename - the file from which the graph is to be read
    
    graph_factory - used to provide a graph instance
    
    Returns:
    
    a graph parsed from the specified file
    
    Throws:
    
    java.io.IOException - if the graph cannot be loaded
  - load
```
public G load(java.io.Reader reader,
              com.google.common.base.Supplier<? extends G> graph_factory)
       throws java.io.IOException
```
    Returns the graph created by parsing the specified reader, as created by the specified Supplier.
    
    Parameters:
    
    reader - the reader instance from which the graph is to be read
    
    graph_factory - used to provide a graph instance
    
    Returns:
    
    a graph parsed from the specified reader
    
    Throws:
    
    java.io.IOException - if the graph cannot be loaded
  - load
```
public G load(java.lang.String filename,
              G g)
       throws java.io.IOException
```
    Returns the graph created by parsing the specified file, by populating the specified graph.
    
    Parameters:
    
    filename - the file from which the graph is to be read
    
    g - the graph instance to populate
    
    Returns:
    
    a graph parsed from the specified file
    
    Throws:
    
    java.io.IOException - if the graph cannot be loaded
  - load
```
public G load(java.io.Reader reader,
              G g)
       throws java.io.IOException
```
    Populates the graph g with the graph represented by the Pajek-format data supplied by reader. Stores edge weights, if any, according to nev (if non-null).
    Any existing vertices/edges of g, if any, are unaffected.
    The edge data are filtered according to g's constraints, if any; thus, if g only accepts directed edges, any undirected edges in the input are ignored.
    
    Parameters:
    
    reader - the reader from which the graph is to be read
    
    g - the graph instance to populate
    
    Returns:
    
    a graph parsed from the specified reader
    
    Throws:
    
    java.io.IOException - if the graph cannot be loaded
  - readVertex
```
private void readVertex(java.lang.String curLine,
                        java.util.List<V> id,
                        int num_vertices)
```
    Parses curLine as a reference to a vertex, and optionally assigns label and location information.
  - readArcsOrEdges
```
private java.lang.String readArcsOrEdges(java.lang.String curLine,
                                         java.io.BufferedReader br,
                                         Graph<V,E> g,
                                         java.util.List<V> id,
                                         com.google.common.base.Supplier<E> edge_factory)
                                  throws java.io.IOException
```
    Throws:
    
    java.io.IOException
  - createAddEdge
```
protected E createAddEdge(java.util.StringTokenizer st,
                          V v1,
                          EdgeType directed,
                          Graph<V,E> g,
                          java.util.List<V> id,
                          com.google.common.base.Supplier<E> edge_factory)
```
  - skip
```
protected java.lang.String skip(java.io.BufferedReader br,
                                com.google.common.base.Predicate<java.lang.String> p)
                         throws java.io.IOException
```
    Returns the first line read from br for which p returns true, or null if there is no such line.
    
    Parameters:
    
    br - the reader from which the graph is being read
    
    p - predicate specifying what line to accept
    
    Returns:
    
    the first line from br that matches p, or null
    
    Throws:
    
    java.io.IOException - if an error is encountered while reading from br
  - getVertexLocationTransformer
```
public SettableTransformer<V,java.awt.geom.Point2D> getVertexLocationTransformer()
```
    Returns:
    
    the vertexLocationTransformer
  - setVertexLocationTransformer
```
public void setVertexLocationTransformer(SettableTransformer<V,java.awt.geom.Point2D> vertex_locations)
```
    Provides a Function which will be used to write out the vertex locations.
    
    Parameters:
    
    vertex_locations - a container for the vertex locations
  - getVertexLabeller
```
public SettableTransformer<V,java.lang.String> getVertexLabeller()
```
    Returns:
    
    a mapping from vertices to their labels
  - setVertexLabeller
```
public void setVertexLabeller(SettableTransformer<V,java.lang.String> vertex_labels)
```
    Provides a Function which will be used to write out the vertex labels.
    
    Parameters:
    
    vertex_labels - a container for the vertex labels
  - getEdgeWeightTransformer
```
public SettableTransformer<E,java.lang.Number> getEdgeWeightTransformer()
```
    Returns:
    
    a mapping from edges to their weights
  - setEdgeWeightTransformer
```
public void setEdgeWeightTransformer(SettableTransformer<E,java.lang.Number> edge_weights)
```
    Provides a Function which will be used to write out edge weights.
    
    Parameters:
    
    edge_weights - a container for the edge weights

Class PajekNetReader<G extends Graph<V,​E>,​V,​E>

Nested Class Summary

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

vertex_factory

edge_factory

vertex_labels

vertex_locations

edge_weights

v_pred

a_pred

e_pred

t_pred

c_pred

l_pred

Constructor Detail

PajekNetReader

PajekNetReader

Method Detail

load

load

load

load

readVertex

readArcsOrEdges

createAddEdge

skip

getVertexLocationTransformer

setVertexLocationTransformer

getVertexLabeller

setVertexLabeller

getEdgeWeightTransformer

setEdgeWeightTransformer

Class PajekNetReader<G extends Graph<V,E>,V,E>