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/*
* Copyright 2007 - 2018 ETH Zuerich, CISD and SIS.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package ch.systemsx.cisd.hdf5;
import java.lang.reflect.AccessibleObject;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.util.HashMap;
import java.util.Map;
/**
* Utility methods for reflection, used for inferring the mapping between a compound data type and
* the fields of a Java class.
* <p>
* <i>This is an internal API that should not be expected to be stable between releases!</i>
*
* @author Bernd Rinn
*/
public final class ReflectionUtils
{
private ReflectionUtils()
{
// Cannot be instantiated
}
/**
* Returns a map from field names to fields for all fields in the given <var>clazz</var>.
*/
public static Map<String, Field> getFieldMap(final Class<?> clazz)
{
return getFieldMap(clazz, true);
}
/**
* Returns a map from field names to fields for all fields in the given <var>clazz</var>.
*
* @param clazz The clazz to get the fields from.
* @param excludeNonMappedFields If <code>true</code>, do not include fields to the map which
* are not supposed to be mapped to HDF5 members.
*/
public static Map<String, Field> getFieldMap(final Class<?> clazz,
boolean excludeNonMappedFields)
{
final Map<String, Field> map = new HashMap<String, Field>();
final CompoundType ct = clazz.getAnnotation(CompoundType.class);
final boolean includeAllFields =
excludeNonMappedFields ? ((ct != null) ? ct.mapAllFields() : true) : true;
for (Class<?> c = clazz; c != null; c = c.getSuperclass())
{
for (Field f : c.getDeclaredFields())
{
final CompoundElement e = f.getAnnotation(CompoundElement.class);
if (e != null && org.apache.commons.lang3.StringUtils.isNotEmpty(e.memberName()))
{
map.put(e.memberName(), f);
} else if (e != null || includeAllFields)
{
map.put(f.getName(), f);
}
}
}
return map;
}
/**
* Ensures that the given <var>member</var> is accessible even if by definition it is not.
*/
public static void ensureAccessible(final AccessibleObject memberOrNull)
{
if (memberOrNull != null && memberOrNull.isAccessible() == false)
{
memberOrNull.setAccessible(true);
}
}
/**
* Creates an object of <var>clazz</var> using the default constructor, making the default
* constructor accessible if necessary.
*/
public static <T> Constructor<T> getDefaultConstructor(final Class<T> clazz)
throws SecurityException, NoSuchMethodException, IllegalArgumentException,
InstantiationException, IllegalAccessException, InvocationTargetException
{
final Constructor<T> defaultConstructor = clazz.getDeclaredConstructor();
ensureAccessible(defaultConstructor);
return defaultConstructor;
}
/**
* Creates an object of <var>clazz</var> using the default constructor, making the default
* constructor accessible if necessary.
*/
public static <T> T newInstance(final Class<T> clazz) throws SecurityException,
NoSuchMethodException, IllegalArgumentException, InstantiationException,
IllegalAccessException, InvocationTargetException
{
final Constructor<T> defaultConstructor = clazz.getDeclaredConstructor();
ensureAccessible(defaultConstructor);
return defaultConstructor.newInstance();
}
/**
* Returns the enum options of the given <var>enumClass</var>. If <var>enumClass</var> is not an
* enum class, return an empty array.
*/
public static String[] getEnumOptions(Class<? extends Enum<?>> enumClass)
{
final Enum<?>[] constants = enumClass.getEnumConstants();
if (constants == null)
{
return new String[0];
}
final String[] options = new String[constants.length];
for (int i = 0; i < options.length; ++i)
{
options[i] = constants[i].name();
}
return options;
}
}
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