org.springframework.ldap.filter.BinaryLogicalFilter Maven / Gradle / Ivy
/*
* Copyright 2005-2013 the original author or authors.
*
* 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 org.springframework.ldap.filter;
import java.util.Collection;
import java.util.LinkedList;
import java.util.List;
/**
* Abstract superclass for binary logical operations, that is "AND"
* and "OR" operations.
*
* @author Mattias Hellborg Arthursson
*/
public abstract class BinaryLogicalFilter extends AbstractFilter {
private List queryList = new LinkedList();
public StringBuffer encode(StringBuffer buff) {
if (queryList.size() <= 0) {
// only output query if contains anything
return buff;
}
else if (queryList.size() == 1) {
// don't add the &
Filter query = queryList.get(0);
return query.encode(buff);
}
else {
buff.append("(").append(getLogicalOperator());
for (Filter query : queryList) {
query.encode(buff);
}
buff.append(")");
return buff;
}
}
/**
* Implement this in subclass to return the logical operator, for example
* "&".
*
* @return the logical operator.
*/
protected abstract String getLogicalOperator();
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
BinaryLogicalFilter that = (BinaryLogicalFilter) o;
if (queryList != null ? !queryList.equals(that.queryList) : that.queryList != null) return false;
return true;
}
@Override
public int hashCode() {
return queryList != null ? queryList.hashCode() : 0;
}
/**
* Add a query to this logical operation.
*
* @param query the query to add.
* @return This instance.
*/
public final BinaryLogicalFilter append(Filter query) {
queryList.add(query);
return this;
}
public final BinaryLogicalFilter appendAll(Collection subQueries) {
queryList.addAll(subQueries);
return this;
}
}