Example usage for java.io ObjectStreamClass getField

Introduction

In this page you can find the example usage for java.io ObjectStreamClass getField.

Prototype

public ObjectStreamField getField(String name) 

Source Link

Document

Get the field of this class by name.

Usage

From source file:edu.cmu.tetrad.util.TetradSerializableUtils.java

/**
 * Deserializes examplars stored in archives in getArchiveDirectory().
 *
 * @throws RuntimeException if clazz cannot be serialized. This exception
 *                          has an informative message and wraps the
 *                          originally thrown exception as root cause.
 * @see #getArchiveDirectory()/*from  w w  w.  j av  a2  s  .c o  m*/
 */
public void deserializeArchivedVersions() throws RuntimeException {
    System.out.println("Deserializing archived instances in " + getArchiveDirectory() + ".");

    File archive = new File(getArchiveDirectory());

    if (!archive.exists() || !archive.isDirectory()) {
        return;
    }

    String[] listing = archive.list();

    for (String archiveName : listing) {
        if (!(archiveName.endsWith(".zip"))) {
            continue;
        }

        try {
            File file = new File(getArchiveDirectory(), archiveName);
            ZipFile zipFile = new ZipFile(file);
            ZipEntry entry = zipFile.getEntry("class_fields.ser");
            InputStream inputStream = zipFile.getInputStream(entry);
            ObjectInputStream objectIn = new ObjectInputStream(inputStream);
            Map<String, List<String>> classFields = (Map<String, List<String>>) objectIn.readObject();
            zipFile.close();

            for (String className : classFields.keySet()) {

                //                    if (classFields.equals("HypotheticalGraph")) continue;

                List<String> fieldNames = classFields.get(className);
                Class<?> clazz = Class.forName(className);
                ObjectStreamClass streamClass = ObjectStreamClass.lookup(clazz);

                if (streamClass == null) {
                    System.out.println();
                }

                for (String fieldName : fieldNames) {
                    assert streamClass != null;
                    ObjectStreamField field = streamClass.getField(fieldName);

                    if (field == null) {
                        throw new RuntimeException("Field '" + fieldName + "' was dropped from class '"
                                + className + "' as a serializable field! Please " + "put it back!!!"
                                + "\nIt used to be in " + className + " in this archive: " + archiveName + ".");
                    }
                }
            }
        } catch (ClassNotFoundException e) {
            throw new RuntimeException("Could not read class_fields.ser in archive + " + archiveName + " .", e);
        } catch (IOException e) {
            throw new RuntimeException("Problem reading archive" + archiveName + "; see cause.", e);
        }

        System.out.println("...Deserializing instances in " + archiveName + "...");
        ZipEntry zipEntry = null;

        try {
            File file = new File(getArchiveDirectory(), archiveName);
            FileInputStream in = new FileInputStream(file);
            ZipInputStream zipinputstream = new ZipInputStream(in);

            while ((zipEntry = zipinputstream.getNextEntry()) != null) {
                if (!zipEntry.getName().endsWith(".ser")) {
                    continue;
                }

                ObjectInputStream objectIn = new ObjectInputStream(zipinputstream);
                objectIn.readObject();
                zipinputstream.closeEntry();
            }

            zipinputstream.close();
        } catch (ClassNotFoundException e) {
            throw new RuntimeException(
                    "Could not read object zipped file " + zipEntry.getName() + " in archive " + archiveName
                            + ". " + "Perhaps the class was renamed, moved to another package, or "
                            + "removed. In any case, please put it back where it was.",
                    e);
        } catch (IOException e) {
            throw new RuntimeException("Problem reading archive" + archiveName + "; see cause.", e);
        }
    }

    System.out.println("Finished deserializing archived instances.");
}

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