69 lines
2.1 KiB
Java
69 lines
2.1 KiB
Java
package ch.fritteli.maze.generator.renderer.pdffile;
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import ch.fritteli.maze.generator.model.Maze;
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import ch.fritteli.maze.generator.renderer.Renderer;
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import ch.fritteli.maze.generator.renderer.pdf.PDFRenderer;
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import io.vavr.control.Option;
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import io.vavr.control.Try;
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import java.io.ByteArrayOutputStream;
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import java.io.File;
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import java.io.IOException;
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import java.nio.file.Files;
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import java.nio.file.Path;
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import java.util.NoSuchElementException;
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import lombok.NonNull;
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import lombok.extern.slf4j.Slf4j;
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@Slf4j
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public class PDFFileRenderer implements Renderer<Path> {
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@NonNull
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private static final PDFRenderer PDF_RENDERER = PDFRenderer.newInstance();
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@NonNull
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private Option<Path> targetFile;
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private PDFFileRenderer() {
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this.targetFile = Try
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.of(() -> Files.createTempFile("maze_", ".pdf"))
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.onFailure(ex -> log.error("Unable to set default target file.", ex))
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.toOption();
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}
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@NonNull
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public static PDFFileRenderer newInstance() {
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return new PDFFileRenderer();
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}
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public boolean isTargetFileDefinedAndWritable() {
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return this.targetFile
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.map(Path::toFile)
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.exists(File::canWrite);
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}
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@NonNull
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public PDFFileRenderer setTargetFile(@NonNull final Path targetFile) {
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this.targetFile = Option.of(targetFile);
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return this;
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}
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@NonNull
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@Override
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public Path render(@NonNull final Maze maze) {
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if (!this.isTargetFileDefinedAndWritable()) {
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try {
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Files.createFile(this.targetFile.get());
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} catch (IOException | NoSuchElementException e) {
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throw new IllegalArgumentException("Cannot write to target file.", e);
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}
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}
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final ByteArrayOutputStream bytes = PDF_RENDERER.render(maze);
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final Path outputFile = this.targetFile.get();
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try {
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bytes.writeTo(Files.newOutputStream(outputFile));
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} catch (IOException e) {
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log.error("Failed writing to file " + outputFile.normalize(), e);
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}
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return outputFile;
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}
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}
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