How to use

getKeyValueForClass

method

in

org.apache.hadoop.hbase.constraint.Constraints

/**
 * Check to see if the Constraint is currently set.
 * 
 * @param desc
 *          {@link HTableDescriptor} to check
 * @param clazz
 *          {@link Constraint} class to check for.
 * @return <tt>true</tt> if the {@link Constraint} is present, even if it is
 *         disabled. <tt>false</tt> otherwise.
 */
public static boolean has(HTableDescriptor desc,
  Class<? extends Constraint> clazz) {
 return getKeyValueForClass(desc, clazz) != null;
}

/**
 * Check to see if the given constraint is enabled.
 * 
 * @param desc
 *          {@link HTableDescriptor} to check.
 * @param clazz
 *          {@link Constraint} to check for
 * @return <tt>true</tt> if the {@link Constraint} is present and enabled.
 *         <tt>false</tt> otherwise.
 * @throws IOException
 *           If the constraint has improperly stored in the table
 */
public static boolean enabled(HTableDescriptor desc,
  Class<? extends Constraint> clazz) throws IOException {
 // get the kv
 Pair<String, String> entry = getKeyValueForClass(desc, clazz);
 // its not enabled so just return false. In fact, its not even present!
 if (entry == null) {
  return false;
 }
 // get the info about the constraint
 Configuration conf = readConfiguration(entry.getSecond());
 return conf.getBoolean(ENABLED_KEY, false);
}

/**
 * Change the whether the constraint (if it is already present) is enabled or
 * disabled.
 */
private static void changeConstraintEnabled(HTableDescriptor desc,
  Class<? extends Constraint> clazz, boolean enabled) throws IOException {
 // get the original constraint
 Pair<String, String> entry = getKeyValueForClass(desc, clazz);
 if (entry == null) {
  throw new IllegalArgumentException("Constraint: " + clazz.getName()
    + " is not associated with this table. You can't enable it!");
 }
 // create a new configuration from that conf
 Configuration conf = readConfiguration(entry.getSecond());
 // set that it is enabled
 conf.setBoolean(ENABLED_KEY, enabled);
 // write it back out
 writeConstraint(desc, entry.getFirst(), conf);
}

 throws IOException, IllegalArgumentException {
Pair<String, String> e = getKeyValueForClass(desc, clazz);

/**
 * Check to see if the Constraint is currently set.
 * 
 * @param desc
 *          {@link HTableDescriptor} to check
 * @param clazz
 *          {@link Constraint} class to check for.
 * @return <tt>true</tt> if the {@link Constraint} is present, even if it is
 *         disabled. <tt>false</tt> otherwise.
 */
public static boolean has(HTableDescriptor desc,
  Class<? extends Constraint> clazz) {
 return getKeyValueForClass(desc, clazz) != null;
}

/**
 * Check to see if the Constraint is currently set.
 * 
 * @param desc
 *          {@link HTableDescriptor} to check
 * @param clazz
 *          {@link Constraint} class to check for.
 * @return <tt>true</tt> if the {@link Constraint} is present, even if it is
 *         disabled. <tt>false</tt> otherwise.
 */
public static boolean has(HTableDescriptor desc,
  Class<? extends Constraint> clazz) {
 return getKeyValueForClass(desc, clazz) != null;
}

/**
 * Check to see if the given constraint is enabled.
 * 
 * @param desc
 *          {@link HTableDescriptor} to check.
 * @param clazz
 *          {@link Constraint} to check for
 * @return <tt>true</tt> if the {@link Constraint} is present and enabled.
 *         <tt>false</tt> otherwise.
 * @throws IOException
 *           If the constraint has improperly stored in the table
 */
public static boolean enabled(HTableDescriptor desc,
  Class<? extends Constraint> clazz) throws IOException {
 // get the kv
 Pair<String, String> entry = getKeyValueForClass(desc, clazz);
 // its not enabled so just return false. In fact, its not even present!
 if (entry == null) {
  return false;
 }
 // get the info about the constraint
 Configuration conf = readConfiguration(entry.getSecond());
 return conf.getBoolean(ENABLED_KEY, false);
}

/**
 * Check to see if the given constraint is enabled.
 * 
 * @param desc
 *          {@link HTableDescriptor} to check.
 * @param clazz
 *          {@link Constraint} to check for
 * @return <tt>true</tt> if the {@link Constraint} is present and enabled.
 *         <tt>false</tt> otherwise.
 * @throws IOException
 *           If the constraint has improperly stored in the table
 */
public static boolean enabled(HTableDescriptor desc,
  Class<? extends Constraint> clazz) throws IOException {
 // get the kv
 Pair<String, String> entry = getKeyValueForClass(desc, clazz);
 // its not enabled so just return false. In fact, its not even present!
 if (entry == null) {
  return false;
 }
 // get the info about the constraint
 Configuration conf = readConfiguration(entry.getSecond());
 return conf.getBoolean(ENABLED_KEY, false);
}

/**
 * Change the whether the constraint (if it is already present) is enabled or
 * disabled.
 */
private static void changeConstraintEnabled(HTableDescriptor desc,
  Class<? extends Constraint> clazz, boolean enabled) throws IOException {
 // get the original constraint
 Pair<String, String> entry = getKeyValueForClass(desc, clazz);
 if (entry == null) {
  throw new IllegalArgumentException("Constraint: " + clazz.getName()
    + " is not associated with this table. You can't enable it!");
 }
 // create a new configuration from that conf
 Configuration conf = readConfiguration(entry.getSecond());
 // set that it is enabled
 conf.setBoolean(ENABLED_KEY, enabled);
 // write it back out
 writeConstraint(desc, entry.getFirst(), conf);
}

/**
 * Change the whether the constraint (if it is already present) is enabled or
 * disabled.
 */
private static void changeConstraintEnabled(HTableDescriptor desc,
  Class<? extends Constraint> clazz, boolean enabled) throws IOException {
 // get the original constraint
 Pair<String, String> entry = getKeyValueForClass(desc, clazz);
 if (entry == null) {
  throw new IllegalArgumentException("Constraint: " + clazz.getName()
    + " is not associated with this table. You can't enable it!");
 }
 // create a new configuration from that conf
 Configuration conf = readConfiguration(entry.getSecond());
 // set that it is enabled
 conf.setBoolean(ENABLED_KEY, enabled);
 // write it back out
 writeConstraint(desc, entry.getFirst(), conf);
}

 throws IOException, IllegalArgumentException {
Pair<String, String> e = getKeyValueForClass(desc, clazz);

 throws IOException, IllegalArgumentException {
Pair<String, String> e = getKeyValueForClass(desc, clazz);