Example usage for java.nio.file DirectoryStream.Filter DirectoryStream.Filter

Introduction

In this page you can find the example usage for java.nio.file DirectoryStream.Filter DirectoryStream.Filter.

Prototype

DirectoryStream.Filter

Source Link

Usage

From source file:com.cloudbees.clickstack.util.Files2.java

/**
 * @param srcDir/*ww w  .jav  a 2  s.  c o  m*/
 * @param pattern
 * @return
 * @throws RuntimeIOException
 * @throws IllegalStateException More or less than 1 child dir found
 */
@Nonnull
public static Path findUniqueDirectoryBeginningWith(@Nonnull Path srcDir, @Nonnull final String pattern)
        throws RuntimeIOException, IllegalStateException {
    Preconditions.checkArgument(Files.isDirectory(srcDir), "Source %s is not a directory",
            srcDir.toAbsolutePath());

    DirectoryStream.Filter<Path> filter = new DirectoryStream.Filter<Path>() {
        @Override
        public boolean accept(Path entry) throws IOException {
            String fileName = entry.getFileName().toString();
            if (pattern == null) {
                return true;
            } else if (fileName.startsWith(pattern)) {
                return true;
            } else {
                return false;
            }
        }
    };

    try (DirectoryStream<Path> paths = Files.newDirectoryStream(srcDir, filter)) {
        try {
            return Iterables.getOnlyElement(paths);
        } catch (NoSuchElementException e) {
            throw new IllegalStateException("Directory beginning with '" + pattern + "' not found in path: "
                    + srcDir + ", absolutePath: " + srcDir.toAbsolutePath());
        } catch (IllegalArgumentException e) {
            throw new IllegalStateException(
                    "More than 1 directory beginning with '" + pattern + "' found in path: " + srcDir
                            + ", absolutePath: " + srcDir.toAbsolutePath() + " -> " + paths);
        }
    } catch (IOException e) {
        throw new RuntimeIOException(
                "Exception finding unique child directory beginning with " + filter + "in " + srcDir);
    }
}

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From source file:com.cloudbees.clickstack.util.Files2.java

/**
 * Find a file matching {@code $artifactId*$type} in the given {@code srcDir}.
 *
 * @param srcDir/*w  w  w. j a  va2s .co m*/
 * @param artifactId
 * @param type
 * @return
 * @throws IllegalStateException More or less than 1 matching artifact found
 * @throws RuntimeIOException
 */
@Nonnull
public static Path findArtifact(@Nonnull Path srcDir, @Nonnull final String artifactId,
        @Nonnull final String type) throws RuntimeIOException, IllegalStateException {
    Preconditions.checkArgument(Files.isDirectory(srcDir), "Source %s is not a directory",
            srcDir.toAbsolutePath());
    DirectoryStream.Filter<Path> filter = new DirectoryStream.Filter<Path>() {
        @Override
        public boolean accept(Path entry) throws IOException {
            String fileName = entry.getFileName().toString();
            if (fileName.startsWith(artifactId) && fileName.endsWith("." + type)) {
                return true;
            } else {
                return false;
            }
        }
    };
    try (DirectoryStream<Path> paths = Files.newDirectoryStream(srcDir, filter)) {
        try {
            return Iterables.getOnlyElement(paths);
        } catch (NoSuchElementException e) {
            throw new IllegalStateException("Artifact '" + artifactId + ":" + type + "' not found in path: "
                    + srcDir + ", absolutePath: " + srcDir.toAbsolutePath());
        } catch (IllegalArgumentException e) {
            throw new IllegalStateException(
                    "More than 1 version of artifact '" + artifactId + ":" + type + "' found in path: " + srcDir
                            + ", absolutePath: " + srcDir.toAbsolutePath() + " -> " + paths);
        }
    } catch (IOException e) {
        throw new RuntimeIOException("Exception finding artifact " + artifactId + "@" + type + " in " + srcDir);
    }
}

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