Example usage for java.io ObjectStreamClass getFields

Introduction

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

Prototype

public ObjectStreamField[] getFields() 

Source Link

Document

Return an array of the fields of this serializable class.

Usage

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

/**
 * Serializes the given class to the getCurrentDirectory() directory. The
 * static serializedInstance() method of clazz will be called to get an
 * examplar of clazz. This examplar will then be serialized out to a file
 * stored in getCurrentDirectory().//from  ww w  .jav  a2  s .  c o m
 *
 * @param clazz the class to serialize.
 * @throws RuntimeException if clazz cannot be serialized. This exception
 *                          has an informative message and wraps the
 *                          originally thrown exception as root cause.
 * @see #getCurrentDirectory()
 */
private void serializeClass(Class clazz, Map<String, List<String>> classFields) throws RuntimeException {
    File current = new File(getCurrentDirectory());

    if (!current.exists() || !current.isDirectory()) {
        throw new IllegalStateException("There is no " + current.getAbsolutePath() + " directory. "
                + "\nThis is where the serialized classes should be. "
                + "Please run serializeCurrentDirectory() first.");
    }

    try {
        Field field = clazz.getDeclaredField("serialVersionUID");

        int modifiers = field.getModifiers();
        boolean _static = Modifier.isStatic(modifiers);
        boolean _final = Modifier.isFinal(modifiers);
        field.setAccessible(true);

        if (!_static || !_final || !(23L == field.getLong(null))) {
            throw new RuntimeException(
                    "Class " + clazz + " does not define static final " + "long serialVersionUID = 23L");
        }

        int numFields = getNumNonSerialVersionUIDFields(clazz);

        if (numFields > 0) {
            Method method = clazz.getMethod("serializableInstance");
            Object object = method.invoke(null);

            File file = new File(current, clazz.getName() + ".ser");
            boolean created = file.createNewFile();

            FileOutputStream out = new FileOutputStream(file);
            ObjectOutputStream objOut = new ObjectOutputStream(out);
            objOut.writeObject(object);
            out.close();
        }

        // Make entry in list of class fields.
        ObjectStreamClass objectStreamClass = ObjectStreamClass.lookup(clazz);
        String className = objectStreamClass.getName();
        ObjectStreamField[] fields = objectStreamClass.getFields();
        @SuppressWarnings("Convert2Diamond")
        List<String> fieldList = new ArrayList<>();

        for (ObjectStreamField objectStreamField : fields) {
            String fieldName = objectStreamField.getName();
            fieldList.add(fieldName);
        }

        classFields.put(className, fieldList);
    } catch (NoSuchFieldException e) {
        throw new RuntimeException(("There is no static final long field " + "'serialVersionUID' in " + clazz
                + ". Please make one and set it " + "to 23L."));
    } catch (NoSuchMethodException e) {
        throw new RuntimeException(
                "Class " + clazz + "does not " + "have a public static serializableInstance constructor.", e);
    } catch (IllegalAccessException e) {
        throw new RuntimeException(
                "The method serializableInstance() of " + "class " + clazz + " is not public.", e);
    } catch (InvocationTargetException e) {
        throw new RuntimeException(
                "Unable to statically call the " + "serializableInstance() method of class " + clazz + ".", e);
    } catch (IOException e) {
        throw new RuntimeException("Could not create a new, writeable file " + "in " + getCurrentDirectory()
                + " when trying to serialize " + clazz + ".", e);
    }
}

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

/**
 * Serializes the given class to the getCurrentDirectory() directory. The
 * static serializedInstance() method of clazz will be called to get an
 * examplar of clazz. This examplar will then be serialized out to a file
 * stored in getCurrentDirectory().//from w w w .  j  a v  a  2s .c o m
 *
 * @param clazz the class to serialize.
 * @throws RuntimeException if clazz cannot be serialized. This exception
 *                          has an informative message and wraps the
 *                          originally thrown exception as root cause.
 * @see #getCurrentDirectory()
 */
private void serializeClass(Class clazz, Map<String, List<String>> classFields) throws RuntimeException {
    File current = new File(getCurrentDirectory());

    if (!current.exists() || !current.isDirectory()) {
        throw new IllegalStateException("There is no " + current.getAbsolutePath() + " directory. "
                + "\nThis is where the serialized classes should be. "
                + "Please run serializeCurrentDirectory() first.");
    }

    try {
        Field field = clazz.getDeclaredField("serialVersionUID");

        int modifiers = field.getModifiers();
        boolean _static = Modifier.isStatic(modifiers);
        boolean _final = Modifier.isFinal(modifiers);
        field.setAccessible(true);

        if (!_static || !_final || !(23L == field.getLong(null))) {
            throw new RuntimeException(
                    "Class " + clazz + " does not define static final " + "long serialVersionUID = 23L");
        }

        int numFields = getNumNonSerialVersionUIDFields(clazz);

        if (numFields > 0) {
            Method method = clazz.getMethod("serializableInstance", new Class[0]);
            Object object = method.invoke(null, new Object[0]);

            File file = new File(current, clazz.getName() + ".ser");
            file.createNewFile();

            FileOutputStream out = new FileOutputStream(file);
            ObjectOutputStream objOut = new ObjectOutputStream(out);
            objOut.writeObject(object);
            out.close();
        }

        // Make entry in list of class fields.
        ObjectStreamClass objectStreamClass = ObjectStreamClass.lookup(clazz);
        String className = objectStreamClass.getName();
        ObjectStreamField[] fields = objectStreamClass.getFields();
        List<String> fieldList = new ArrayList<String>();

        for (ObjectStreamField objectStreamField : fields) {
            String fieldName = objectStreamField.getName();
            fieldList.add(fieldName);
        }

        classFields.put(className, fieldList);
    } catch (NoSuchFieldException e) {
        throw new RuntimeException(("There is no static final long field " + "'serialVersionUID' in " + clazz
                + ". Please make one and set it " + "to 23L."));
    } catch (NoSuchMethodException e) {
        throw new RuntimeException(
                "Class " + clazz + "does not " + "have a public static serializableInstance constructor.", e);
    } catch (IllegalAccessException e) {
        throw new RuntimeException(
                "The method serializableInstance() of " + "class " + clazz + " is not public.", e);
    } catch (InvocationTargetException e) {
        throw new RuntimeException(
                "Unable to statically call the " + "serializableInstance() method of class " + clazz + ".", e);
    } catch (IOException e) {
        throw new RuntimeException("Could not create a new, writeable file " + "in " + getCurrentDirectory()
                + " when trying to serialize " + clazz + ".", e);
    }
}

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From source file:org.openengsb.core.persistence.internal.SerializableChecker.java

private void checkFields(Object obj, ObjectStreamClass desc) {
    int numFields;
    try {/* w w w. j a  v a2s.co  m*/
        numFields = (Integer) getNumObjFieldsMethod.invoke(desc, (Object[]) null);
    } catch (IllegalAccessException e) {
        throw new RuntimeException(e);
    } catch (InvocationTargetException e) {
        throw new RuntimeException(e);
    }

    if (numFields > 0) {
        int numPrimFields;
        ObjectStreamField[] fields = desc.getFields();
        Object[] objVals = new Object[numFields];
        numPrimFields = fields.length - objVals.length;
        try {
            getObjFieldValuesMethod.invoke(desc, obj, objVals);
        } catch (IllegalAccessException e) {
            throw new RuntimeException(e);
        } catch (InvocationTargetException e) {
            throw new RuntimeException(e);
        }
        for (int i = 0; i < objVals.length; i++) {
            if (objVals[i] instanceof String || objVals[i] instanceof Number || objVals[i] instanceof Date
                    || objVals[i] instanceof Boolean || objVals[i] instanceof Class) {
                continue;
            }

            // Check for circular reference.
            if (checked.containsKey(objVals[i])) {
                continue;
            }

            ObjectStreamField fieldDesc = fields[numPrimFields + i];
            Field field;
            try {
                field = (Field) getFieldMethod.invoke(fieldDesc, (Object[]) null);
            } catch (IllegalAccessException e) {
                throw new RuntimeException(e);
            } catch (InvocationTargetException e) {
                throw new RuntimeException(e);
            }

            field.getName();
            simpleName = field.getName();
            fieldDescription = field.toString();
            check(objVals[i]);
        }
    }
}

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