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Java example source code file (DelimitedVertexLoader.java)

This example Java source code file (DelimitedVertexLoader.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

arraylist, bufferedreader, delimitedvertexloader, error, file, filereader, ioexception, list, override, parseexception, string, util

The DelimitedVertexLoader.java Java example source code

package org.deeplearning4j.graph.data.impl;

import org.deeplearning4j.graph.api.Vertex;
import org.deeplearning4j.graph.data.VertexLoader;
import org.deeplearning4j.graph.exception.ParseException;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

/**Load vertex information, one per line of form "0<delim>Some text attribute/label"
 */
public class DelimitedVertexLoader implements VertexLoader<String> {

    private final String delimiter;
    private final String[] ignoreLinesPrefix;

    public DelimitedVertexLoader(String delimiter){
        this(delimiter,null);
    }

    public DelimitedVertexLoader(String delimiter, String... ignoreLinesPrefix){
        this.delimiter = delimiter;
        this.ignoreLinesPrefix = ignoreLinesPrefix;
    }

    @Override
    public List<Vertex loadVertices(String path) throws IOException {
        List<Vertex vertices = new ArrayList<>();

        int lineCount = 0;
        try(BufferedReader br = new BufferedReader(new FileReader(new File(path)))){
            String line;
            while( (line = br.readLine()) != null ) {
                lineCount++;
                if(ignoreLinesPrefix != null){
                    boolean skipLine = false;
                    for(String s : ignoreLinesPrefix){
                        if(line.startsWith(s)){
                            skipLine = true;
                            break;
                        }
                    }
                    if(skipLine) continue;
                }

                int idx = line.indexOf(delimiter);
                if(idx == -1) throw new ParseException("Error parsing line (could not find delimiter): " + line);

                String first = line.substring(0,idx);
                String second = line.substring(idx+1);

                vertices.add(new Vertex<>(Integer.parseInt(first),second));
            }
        }

        return vertices;
    }
}

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