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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.apache.jackrabbit.oak.plugins.observation.filter;
import static com.google.common.base.Preconditions.checkNotNull;
import static org.apache.jackrabbit.oak.plugins.observation.filter.ConstantFilter.EXCLUDE_ALL;
import static org.apache.jackrabbit.oak.plugins.observation.filter.ConstantFilter.INCLUDE_ALL;
import java.util.List;
import javax.annotation.Nonnull;
import com.google.common.collect.Lists;
import org.apache.jackrabbit.oak.api.PropertyState;
import org.apache.jackrabbit.oak.spi.state.NodeState;
/**
* This utility class provides common {@link EventFilter} instances
*/
public final class Filters {
private Filters() {
}
/**
* A filter that matches if and only if any the filter passed to this
* method does not match.
* @param filter filter which must not match
* @return {@code true} if {@code filter} does not match.
*/
@Nonnull
public static EventFilter not(@Nonnull final EventFilter filter) {
return new EventFilter() {
@Override
public boolean includeAdd(PropertyState after) {
return !filter.includeAdd(after);
}
@Override
public boolean includeChange(PropertyState before, PropertyState after) {
return !filter.includeChange(before, after);
}
@Override
public boolean includeDelete(PropertyState before) {
return !filter.includeDelete(before);
}
@Override
public boolean includeAdd(String name, NodeState after) {
return !filter.includeAdd(name, after);
}
@Override
public boolean includeDelete(String name, NodeState before) {
return !filter.includeDelete(name, before);
}
@Override
public boolean includeMove(String sourcePath, String name, NodeState moved) {
return !filter.includeMove(sourcePath, name, moved);
}
@Override
public boolean includeReorder(String destName, String name, NodeState reordered) {
return !filter.includeReorder(destName, name, reordered);
}
@Override
public EventFilter create(String name, NodeState before, NodeState after) {
EventFilter childFilter = filter.create(name, before, after);
return childFilter == null
? INCLUDE_ALL
: not(childFilter);
}
};
}
/**
* A filter that matches if and only if any of the filters passed to this
* method matches.
* @param filters filters of which any must match
* @return {@code true} if any of {@code filters} match.
*/
@Nonnull
public static EventFilter any(@Nonnull final EventFilter... filters) {
return any(Lists.newArrayList(checkNotNull(filters)));
}
/**
* A filter that matches if and only if all of the filters passed to this
* method matches.
* @param filters filters of which all must match
* @return {@code true} if all of {@code filters} match.
*/
@Nonnull
public static EventFilter all(@Nonnull final EventFilter... filters) {
return all(Lists.newArrayList(checkNotNull(filters)));
}
/**
* @return Filter that includes everything
*/
@Nonnull
public static EventFilter includeAll() {
return INCLUDE_ALL;
}
/**
* @return Filter that excludes everything
*/
@Nonnull
public static EventFilter excludeAll() {
return EXCLUDE_ALL;
}
/**
* A filter that matches if and only if any of the filters passed to this
* method matches.
* @param filters filters of which any must match
* @return {@code true} if any of {@code filters} match.
*/
@Nonnull
public static EventFilter any(@Nonnull final List filters) {
if (checkNotNull(filters).isEmpty()) {
return EXCLUDE_ALL;
} else if (filters.size() == 1) {
return filters.get(0);
} else {
return new EventFilter() {
@Override
public boolean includeAdd(PropertyState after) {
for (EventFilter filter : filters) {
if (filter.includeAdd(after)) {
return true;
}
}
return false;
}
@Override
public boolean includeChange(PropertyState before, PropertyState after) {
for (EventFilter filter : filters) {
if (filter.includeChange(before, after)) {
return true;
}
}
return false;
}
@Override
public boolean includeDelete(PropertyState before) {
for (EventFilter filter : filters) {
if (filter.includeDelete(before)) {
return true;
}
}
return false;
}
@Override
public boolean includeAdd(String name, NodeState after) {
for (EventFilter filter : filters) {
if (filter.includeAdd(name, after)) {
return true;
}
}
return false;
}
@Override
public boolean includeDelete(String name, NodeState before) {
for (EventFilter filter : filters) {
if (filter.includeDelete(name, before)) {
return true;
}
}
return false;
}
@Override
public boolean includeMove(String sourcePath, String name, NodeState moved) {
for (EventFilter filter : filters) {
if (filter.includeMove(sourcePath, name, moved)) {
return true;
}
}
return false;
}
@Override
public boolean includeReorder(String destName, String name, NodeState reordered) {
for (EventFilter filter : filters) {
if (filter.includeReorder(destName, name, reordered)) {
return true;
}
}
return false;
}
@Override
public EventFilter create(String name, NodeState before, NodeState after) {
List childFilters = Lists.newArrayList();
for (EventFilter filter : filters) {
EventFilter childFilter = filter.create(name, before, after);
if (childFilter != null) {
childFilters.add(childFilter);
}
}
return any(childFilters);
}
};
}
}
/**
* A filter that matches if and only if all of the filters passed to this
* method matches.
* @param filters filters of which all must match
* @return {@code true} if all of {@code filters} match.
*/
@Nonnull
public static EventFilter all(@Nonnull final List filters) {
if (checkNotNull(filters).isEmpty()) {
return INCLUDE_ALL;
} else if (filters.size() == 1) {
return filters.get(0);
} else {
return new EventFilter() {
@Override
public boolean includeAdd(PropertyState after) {
for (EventFilter filter : filters) {
if (!filter.includeAdd(after)) {
return false;
}
}
return true;
}
@Override
public boolean includeChange(PropertyState before, PropertyState after) {
for (EventFilter filter : filters) {
if (!filter.includeChange(before, after)) {
return false;
}
}
return true;
}
@Override
public boolean includeDelete(PropertyState before) {
for (EventFilter filter : filters) {
if (!filter.includeDelete(before)) {
return false;
}
}
return true;
}
@Override
public boolean includeAdd(String name, NodeState after) {
for (EventFilter filter : filters) {
if (!filter.includeAdd(name, after)) {
return false;
}
}
return true;
}
@Override
public boolean includeDelete(String name, NodeState before) {
for (EventFilter filter : filters) {
if (!filter.includeDelete(name, before)) {
return false;
}
}
return true;
}
@Override
public boolean includeMove(String sourcePath, String name, NodeState moved) {
for (EventFilter filter : filters) {
if (!filter.includeMove(sourcePath, name, moved)) {
return false;
}
}
return true;
}
@Override
public boolean includeReorder(String destName, String name, NodeState reordered) {
for (EventFilter filter : filters) {
if (!filter.includeReorder(destName, name, reordered)) {
return false;
}
}
return true;
}
@Override
public EventFilter create(String name, NodeState before, NodeState after) {
List childFilters = Lists.newArrayList();
for (EventFilter filter : filters) {
EventFilter childFilter = filter.create(name, before, after);
if (childFilter == null) {
return null;
} else {
childFilters.add(childFilter);
}
}
return all(childFilters);
}
};
}
}
}
