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/*
* Copyright 2013 gitblit.com.
*
* 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 com.gitblit.tickets;
import com.gitblit.utils.StringUtils;
/**
* A Lucene query builder.
*
* @author James Moger
*
*/
public class QueryBuilder {
private final QueryBuilder parent;
private String q;
private transient StringBuilder sb;
private int opCount;
public static QueryBuilder q(String kernel) {
return new QueryBuilder(kernel);
}
private QueryBuilder(QueryBuilder parent) {
this.sb = new StringBuilder();
this.parent = parent;
}
public QueryBuilder() {
this("");
}
public QueryBuilder(String query) {
this.sb = new StringBuilder(query == null ? "" : query);
this.parent = null;
}
public boolean containsField(String field) {
return sb.toString().contains(field + ":");
}
/**
* Creates a new AND subquery. Make sure to call endSubquery to
* get return *this* query.
*
* e.g. field:something AND (subquery)
*
* @return a subquery
*/
public QueryBuilder andSubquery() {
sb.append(" AND (");
return new QueryBuilder(this);
}
/**
* Creates a new OR subquery. Make sure to call endSubquery to
* get return *this* query.
*
* e.g. field:something OR (subquery)
*
* @return a subquery
*/
public QueryBuilder orSubquery() {
sb.append(" OR (");
return new QueryBuilder(this);
}
/**
* Ends a subquery and returns the parent query.
*
* @return the parent query
*/
public QueryBuilder endSubquery() {
this.q = sb.toString().trim();
if (q.length() > 0) {
parent.sb.append(q).append(')');
}
return parent;
}
/**
* Append an OR condition.
*
* @param condition
* @return
*/
public QueryBuilder or(String condition) {
return op(condition, " OR ");
}
/**
* Append an AND condition.
*
* @param condition
* @return
*/
public QueryBuilder and(String condition) {
return op(condition, " AND ");
}
/**
* Append an AND NOT condition.
*
* @param condition
* @return
*/
public QueryBuilder andNot(String condition) {
return op(condition, " AND NOT ");
}
/**
* Nest this query as a subquery.
*
* e.g. field:something AND field2:something else
* ==> (field:something AND field2:something else)
*
* @return this query nested as a subquery
*/
public QueryBuilder toSubquery() {
if (opCount > 1) {
sb.insert(0, '(').append(')');
}
return this;
}
/**
* Nest this query as an AND subquery of the condition
*
* @param condition
* @return the query nested as an AND subquery of the specified condition
*/
public QueryBuilder subqueryOf(String condition) {
if (!StringUtils.isEmpty(condition)) {
toSubquery().and(condition);
}
return this;
}
/**
* Removes a condition from the query.
*
* @param condition
* @return the query
*/
public QueryBuilder remove(String condition) {
int start = sb.indexOf(condition);
if (start == 0) {
// strip first condition
sb.replace(0, condition.length(), "");
} else if (start > 1) {
// locate condition in query
int space1 = sb.lastIndexOf(" ", start - 1);
int space0 = sb.lastIndexOf(" ", space1 - 1);
if (space0 > -1 && space1 > -1) {
String conjunction = sb.substring(space0, space1).trim();
if ("OR".equals(conjunction) || "AND".equals(conjunction)) {
// remove the conjunction
sb.replace(space0, start + condition.length(), "");
} else {
// unknown conjunction
sb.replace(start, start + condition.length(), "");
}
} else {
sb.replace(start, start + condition.length(), "");
}
}
return this;
}
/**
* Generate the return the Lucene query.
*
* @return the generated query
*/
public String build() {
if (parent != null) {
throw new IllegalAccessError("You can not build a subquery! endSubquery() instead!");
}
this.q = sb.toString().trim();
// cleanup paranthesis
while (q.contains("()")) {
q = q.replace("()", "");
}
if (q.length() > 0) {
if (q.charAt(0) == '(' && q.charAt(q.length() - 1) == ')') {
// query is wrapped by unnecessary paranthesis
q = q.substring(1, q.length() - 1);
}
}
if (q.startsWith("AND ")) {
q = q.substring(3).trim();
}
if (q.startsWith("OR ")) {
q = q.substring(2).trim();
}
return q;
}
private QueryBuilder op(String condition, String op) {
opCount++;
if (!StringUtils.isEmpty(condition)) {
if (sb.length() != 0) {
sb.append(op);
}
sb.append(condition);
}
return this;
}
@Override
public String toString() {
return sb.toString().trim();
}
}
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