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Java example source code file (DelimitedEdgeLineProcessor.java)

This example Java source code file (DelimitedEdgeLineProcessor.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

delimitededgelineprocessor, edge, illegalargumentexception, invalid, override, string

The DelimitedEdgeLineProcessor.java Java example source code

package org.deeplearning4j.graph.data.impl;

import lombok.AllArgsConstructor;
import org.deeplearning4j.graph.api.Edge;
import org.deeplearning4j.graph.data.EdgeLineProcessor;

/**A simple line processor, for data in the format
 * 0<delim>1\n 30\n etc. Order per line is nodeFrom -> nodeTo, in the case of directed edges
 * i.e., one edge per line without any additional edge information
public class DelimitedEdgeLineProcessor implements EdgeLineProcessor<String> {
    private final String delimiter;
    private final String[] skipLinesStartingWith;
    private final boolean directed;

    public DelimitedEdgeLineProcessor(String delimiter, boolean directed){

    public DelimitedEdgeLineProcessor(String delimiter, boolean directed, String... skipLinesStartingWith){
        this.delimiter = delimiter;
        this.skipLinesStartingWith = skipLinesStartingWith;
        this.directed = directed;

    public Edge<String> processLine(String line) {
        if(skipLinesStartingWith != null){
            for (String s : skipLinesStartingWith) {
                if (line.startsWith(s)) return null;

        String[] split = line.split(delimiter);
        if(split.length != 2) throw new IllegalArgumentException("Invalid line: expected format \"" + 0 + delimiter +
            1 + "\"; received \"" + line + "\"");

        int from = Integer.parseInt(split[0]);
        int to = Integer.parseInt(split[1]);
        String edgeName = from + (directed ? "->" : "--") + to;
        return new Edge<>(from,to,edgeName,directed);

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