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/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch 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.elasticsearch.common.xcontent.support.filtering;
import com.fasterxml.jackson.core.filter.TokenFilter;
import org.elasticsearch.common.util.CollectionUtils;
import java.util.ArrayList;
import java.util.List;
public class FilterPathBasedFilter extends TokenFilter {
/**
* Marker value that should be used to indicate that a property name
* or value matches one of the filter paths.
*/
private static final TokenFilter MATCHING = new TokenFilter(){};
/**
* Marker value that should be used to indicate that none of the
* property names/values matches one of the filter paths.
*/
private static final TokenFilter NO_MATCHING = new TokenFilter(){};
private final FilterPath[] filters;
public FilterPathBasedFilter(FilterPath[] filters) {
if (CollectionUtils.isEmpty(filters)) {
throw new IllegalArgumentException("filters cannot be null or empty");
}
this.filters = filters;
}
public FilterPathBasedFilter(String[] filters) {
this(FilterPath.compile(filters));
}
/**
* Evaluates if a property name matches one of the given filter paths.
*/
private TokenFilter evaluate(String name, FilterPath[] filters) {
if (filters != null) {
List nextFilters = null;
for (FilterPath filter : filters) {
FilterPath next = filter.matchProperty(name);
if (next != null) {
if (next.matches()) {
return MATCHING;
} else {
if (nextFilters == null) {
nextFilters = new ArrayList<>();
}
if (filter.isDoubleWildcard()) {
nextFilters.add(filter);
}
nextFilters.add(next);
}
}
}
if ((nextFilters != null) && (nextFilters.isEmpty() == false)) {
return new FilterPathBasedFilter(nextFilters.toArray(new FilterPath[nextFilters.size()]));
}
}
return NO_MATCHING;
}
@Override
public TokenFilter includeProperty(String name) {
TokenFilter include = evaluate(name, filters);
if (include == MATCHING) {
return TokenFilter.INCLUDE_ALL;
}
if (include == NO_MATCHING) {
return null;
}
return include;
}
@Override
protected boolean _includeScalar() {
for (FilterPath filter : filters) {
if (filter.matches()) {
return true;
}
}
return false;
}
}