org.apache.hive.service.auth.ldap.Query Maven / Gradle / Ivy
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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.hive.service.auth.ldap;
import com.google.common.base.Preconditions;
import java.util.ArrayList;
import java.util.List;
import javax.naming.directory.SearchControls;
import org.stringtemplate.v4.ST;
/**
* The object that encompasses all components of a Directory Service search query.
*
* @see LdapSearch
*/
public final class Query {
private final String filter;
private final SearchControls controls;
/**
* Constructs an instance of Directory Service search query.
* @param filter search filter
* @param controls search controls
*/
public Query(String filter, SearchControls controls) {
this.filter = filter;
this.controls = controls;
}
/**
* Returns search filter.
* @return search filter
*/
public String getFilter() {
return filter;
}
/**
* Returns search controls.
* @return search controls
*/
public SearchControls getControls() {
return controls;
}
/**
* Creates Query Builder.
* @return query builder.
*/
public static QueryBuilder builder() {
return new QueryBuilder();
}
/**
* A builder of the {@link Query}.
*/
public static final class QueryBuilder {
private ST filterTemplate;
private final SearchControls controls = new SearchControls();
private final List returningAttributes = new ArrayList<>();
private QueryBuilder() {
controls.setSearchScope(SearchControls.SUBTREE_SCOPE);
controls.setReturningAttributes(new String[0]);
}
/**
* Sets search filter template.
* @param filterTemplate search filter template
* @return the current instance of the builder
*/
public QueryBuilder filter(String filterTemplate) {
this.filterTemplate = new ST(filterTemplate);
return this;
}
/**
* Sets mapping between names in the search filter template and actual values.
* @param key marker in the search filter template.
* @param value actual value
* @return the current instance of the builder
*/
public QueryBuilder map(String key, String value) {
filterTemplate.add(key, value);
return this;
}
/**
* Sets attribute that should be returned in results for the query.
* @param attributeName attribute name
* @return the current instance of the builder
*/
public QueryBuilder returnAttribute(String attributeName) {
returningAttributes.add(attributeName);
return this;
}
/**
* Sets the maximum number of entries to be returned as a result of the search.
*
* 0 indicates no limit: all entries will be returned.
* @param limit The maximum number of entries that will be returned.
* @return the current instance of the builder
*/
public QueryBuilder limit(int limit) {
controls.setCountLimit(limit);
return this;
}
private void validate() {
Preconditions.checkArgument(filterTemplate != null,
"filter is required for LDAP search query");
}
private String createFilter() {
return filterTemplate.render();
}
private void updateControls() {
if (!returningAttributes.isEmpty()) {
controls.setReturningAttributes(returningAttributes
.toArray(new String[returningAttributes.size()]));
}
}
/**
* Builds an instance of {@link Query}.
* @return configured directory service query
*/
public Query build() {
validate();
String filter = createFilter();
updateControls();
return new Query(filter, controls);
}
}
}