org.semanticweb.elk.util.statistics.Stats Maven / Gradle / Ivy
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package org.semanticweb.elk.util.statistics;
/*-
* #%L
* ELK Utilities Collections
* $Id:$
* $HeadURL:$
* %%
* Copyright (C) 2011 - 2024 Department of Computer Science, University of Oxford
* %%
* 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.
* #L%
*/
import java.lang.annotation.Annotation;
import java.lang.reflect.AnnotatedElement;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Member;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.AbstractMap;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;
import com.google.common.base.Function;
import com.google.common.base.Preconditions;
import com.google.common.base.Predicate;
import com.google.common.collect.Iterables;
public class Stats {
public static final String STAT_NAME_SEPARATOR = ".";
private Stats() {
// Forbid instantiation of a utility class.
}
public static Map copyIntoMap(final Object hasStats,
Map result) {
if (result == null) {
result = new HashMap();
}
final Iterable> stats = getStats(hasStats);
for (final Map.Entry e : stats) {
result.put(e.getKey(), e.getValue());
}
return result;
}
public static Map copyIntoMap(final Object hasStats) {
return copyIntoMap(hasStats, new HashMap());
}
public static Iterable> getStats(
final Object hasStats) {
return getStats(hasStats, "");
}
public static Iterable> getStats(
final Object hasStats, final String statNamePrefix) {
Preconditions.checkNotNull(hasStats);
Preconditions.checkNotNull(statNamePrefix);
if (hasStats instanceof Class) {
return getStats((Class) hasStats, null, statNamePrefix);
} else {
return getStats(hasStats.getClass(), hasStats, statNamePrefix);
}
}
public static Iterable> getStats(
final Class hasStatsClass, final Object hasStats,
final String statNamePrefix) {
Preconditions.checkNotNull(hasStatsClass);
Preconditions.checkNotNull(statNamePrefix);
final Iterable statFields = getAnnotatedElements(Stat.class,
hasStatsClass.getFields());
final Iterable> fieldStats = Iterables
.transform(statFields,
new Function>() {
@Override
public Map.Entry apply(
final Field field) {
return new AbstractMap.SimpleImmutableEntry(
statNamePrefix + getStatName(field),
checkedGet(field, hasStats));
}
});
final Iterable statMethods = getAnnotatedElements(Stat.class,
hasStatsClass.getMethods());
final Iterable> methodStats = Iterables
.transform(statMethods,
new Function>() {
@Override
public Map.Entry apply(
final Method method) {
return new AbstractMap.SimpleImmutableEntry(
statNamePrefix + getStatName(method),
checkedInvoke(method, hasStats));
}
});
// Recursion into nested stats
final Iterable> nesteds = getNested(
hasStatsClass, hasStats, statNamePrefix);
final Iterable> nestedStats = Iterables
.concat(Iterables.transform(nesteds,
new Function, Iterable>>() {
@Override
public Iterable> apply(
final Map.Entry entry) {
return getStats(entry.getValue(),
entry.getKey() + STAT_NAME_SEPARATOR);
}
}));
return Iterables.concat(fieldStats, methodStats, nestedStats);
}
public static void resetStats(final Object hasStats) {
Preconditions.checkNotNull(hasStats);
if (hasStats instanceof Class) {
resetStats((Class) hasStats, null);
} else {
resetStats(hasStats.getClass(), hasStats);
}
}
public static void resetStats(final Class hasStatsClass,
final Object hasStats) {
Preconditions.checkNotNull(hasStatsClass);
final Iterable resetMethods = getAnnotatedElements(
ResetStats.class, hasStatsClass.getMethods());
for (final Method resetMethod : resetMethods) {
checkedInvoke(resetMethod, hasStats);
}
// Recursion into nested stats
final Iterable> nesteds = getNested(
hasStatsClass, hasStats);
for (final Map.Entry entry : nesteds) {
resetStats(entry.getValue());
}
}
private static Iterable> getNested(
final Class hasStatsClass, final Object hasStats) {
return getNested(hasStatsClass, hasStats, "");
}
private static Iterable> getNested(
final Class hasStatsClass, final Object hasStats,
final String statNamePrefix) {
Preconditions.checkNotNull(hasStatsClass);
Preconditions.checkNotNull(statNamePrefix);
final Iterable nestedFields = getAnnotatedElements(
NestedStats.class, hasStatsClass.getFields());
final Iterable> fieldNesteds = Iterables
.transform(nestedFields,
new Function>() {
@Override
public Map.Entry apply(
final Field field) {
return new AbstractMap.SimpleImmutableEntry(
statNamePrefix
+ getNestedStatsName(field),
checkedGet(field, hasStats));
}
});
final Iterable nestedMethods = getAnnotatedElements(
NestedStats.class, hasStatsClass.getMethods());
final Iterable> methodNesteds = Iterables
.transform(nestedMethods,
new Function>() {
@Override
public Map.Entry apply(
final Method method) {
return new AbstractMap.SimpleImmutableEntry(
statNamePrefix
+ getNestedStatsName(method),
checkedInvoke(method, hasStats));
}
});
return Iterables.concat(fieldNesteds, methodNesteds);
}
private static Object checkedGet(final Field field, final Object object) {
if (object == null && !Modifier.isStatic(field.getModifiers())) {
throw new StatsException(
"Can handle only static fields! Non-static field: "
+ field);
}
try {
return field.get(object);
} catch (final IllegalAccessException e) {
throw new StatsException(e);
}
}
private static Object checkedInvoke(final Method method,
final Object object) {
if (object == null && !Modifier.isStatic(method.getModifiers())) {
throw new StatsException(
"Can handle only static methods! Non-static method: "
+ method);
}
if (method.getParameterTypes().length != 0) {
throw new StatsException(
"Can handle only methods with no parameters! Method with parameters: "
+ method);
}
try {
return method.invoke(object);
} catch (final IllegalAccessException e) {
throw new StatsException(e);
} catch (final InvocationTargetException e) {
throw new StatsException(e);
}
}
private static Iterable getAnnotatedElements(
final Class presentAnnotation,
final E[] elements) {
return Iterables.filter(Arrays.asList(elements), new Predicate() {
@Override
public boolean apply(final E element) {
return element.isAnnotationPresent(presentAnnotation);
}
});
}
private static String getStatName(
final E element) {
final String name = element.getAnnotation(Stat.class).name();
return name.isEmpty() ? element.getName() : name;
}
private static String getNestedStatsName(
final E element) {
final String name = element.getAnnotation(NestedStats.class).name();
return name.isEmpty() ? element.getName() : name;
}
}
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