org.apache.jackrabbit.oak.query.fulltext.FullTextVisitor Maven / Gradle / Ivy
/*
* 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.query.fulltext;
/**
* A visitor for full-text expressions. This class is abstract because at least
* one of the methods needs to be implemented to make anything useful, most
* likely visit(FullTextTerm).
*/
public interface FullTextVisitor {
/**
* Visit an "contains" expression.
*
* @param contains the "contains" expression
* @return true if visiting should continue
*/
boolean visit(FullTextContains contains);
/**
* Visit an "and" expression.
*
* @param and the "and" expression
* @return true if visiting should continue
*/
boolean visit(FullTextAnd and);
/**
* Visit an "or" expression.
*
* @param or the "or" expression
* @return true if visiting should continue
*/
boolean visit(FullTextOr or);
/**
* Visit a term
*
* @param term the term
* @return true if visiting should continue
*/
boolean visit(FullTextTerm term);
/**
* The base implementation of a full-text visitor.
*/
public abstract static class FullTextVisitorBase implements FullTextVisitor {
@Override
public boolean visit(FullTextContains contains) {
return contains.getBase().accept(this);
}
@Override
public boolean visit(FullTextAnd and) {
for (FullTextExpression e : and.list) {
if (!e.accept(this)) {
return false;
}
}
return true;
}
@Override
public boolean visit(FullTextOr or) {
for (FullTextExpression e : or.list) {
if (!e.accept(this)) {
return false;
}
}
return true;
}
}
}