Example usage for javax.tools JavaFileObject openInputStream

Introduction

In this page you can find the example usage for javax.tools JavaFileObject openInputStream.

Prototype

InputStream openInputStream() throws IOException;

Source Link

Document

Returns an InputStream for this file object.

Usage

From source file:org.cdmckay.coffeep.Program.java

private static ClassFile getClassFile(JavaFileObject fileObject, CoffeepSystemInfo systemInfo)
        throws IOException, ConstantPoolException {
    if (fileObject == null) {
        throw new IllegalArgumentException("fileObject cannot be null");
    }//from w ww  . j  a va  2  s  .  co  m
    if (systemInfo == null) {
        throw new IllegalArgumentException("systemInfo cannot be null");
    }

    InputStream inputStream = fileObject.openInputStream();
    try {
        MessageDigest messageDigest = null;
        try {
            messageDigest = MessageDigest.getInstance("MD5");
        } catch (NoSuchAlgorithmException e) {
            logger.warn("Exception while getting MD5 MessageDigest", e);
        }

        DigestInputStream digestInputStream = new DigestInputStream(inputStream, messageDigest);
        CountingInputStream countingInputStream = new CountingInputStream(digestInputStream);

        Attribute.Factory attributeFactory = new Attribute.Factory();
        ClassFile classFile = ClassFile.read(countingInputStream, attributeFactory);

        systemInfo.classFileUri = fileObject.toUri();
        systemInfo.classFileSize = countingInputStream.getSize();
        systemInfo.lastModifiedTimestamp = fileObject.getLastModified();
        if (messageDigest != null) {
            systemInfo.digestAlgorithm = messageDigest.getAlgorithm();
            systemInfo.digest = new BigInteger(1, messageDigest.digest()).toString(16);
        }

        return classFile;
    } finally {
        inputStream.close();
    }
}

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