com.github.connollyst.jolt.JoltRunner Maven / Gradle / Ivy

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A Maven plugin to apply JSON to JSON transformations using the Jolt spec. Useful as part of a Maven build to transform JSON generated by one plugin to JSON consumable by another.

There is a newer version: 0.1.0.1

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package com.github.connollyst.jolt;

import org.apache.maven.plugin.MojoExecutionException;
import org.apache.maven.plugin.MojoFailureException;
import org.apache.maven.plugin.logging.Log;

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;

/**
 * @author Sean Connolly
 */
public class JoltRunner {

    private final Log log;
    private final String specFile;
    private final String inputDirectory;
    private final String outputDirectory;
    private final boolean minify;

    JoltRunner(Log log, String specFile, String inputDirectory, String outputDirectory, boolean minify) {
        this.log = log;
        this.specFile = specFile;
        this.inputDirectory = inputDirectory;
        this.outputDirectory = outputDirectory;
        this.minify = minify;
    }

    void verify() throws MojoFailureException {
        // TODO assert all paths look legit
    }

    void execute() throws MojoExecutionException {
        log.debug("Jolt transformation spec file: " + specFile);
        log.debug("Jolt input directory: " + inputDirectory);
        log.debug("Jolt output directory: " + outputDirectory);
        try {
            Path spec = asPath(specFile, false);
            Path input = asPath(inputDirectory, false);
            Path output = asPath(outputDirectory, true);
            JoltTransformer transformer = new JoltTransformer(log, minify, spec);
            JoltCrawler crawler = new JoltCrawler(log, input, output, transformer);
            Files.walkFileTree(input, crawler);
        } catch (IOException e) {
            throw new MojoExecutionException(e.getMessage(), e);
        }
    }

    private Path asPath(String filePath, boolean createIfMissing) throws IOException {
        Path path = Paths.get(filePath);
        if (!Files.exists(path)) {
            if (createIfMissing) {
                log.info("Creating " + filePath);
                Files.createDirectories(Paths.get(filePath));
                Files.createDirectory(Paths.get(filePath));
                return asPath(filePath, false);
            } else {
                throw new IOException("File not found: " + filePath);
            }
        }
        return path;
    }

}