/*
* Copyright 2012 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.data.gemfire.repository.query;
import java.util.Iterator;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.data.domain.Sort;
import org.springframework.data.gemfire.mapping.GemfirePersistentEntity;
import org.springframework.data.repository.query.parser.AbstractQueryCreator;
import org.springframework.data.repository.query.parser.Part;
import org.springframework.data.repository.query.parser.PartTree;
/**
* Query creator to create {@link QueryString} instances.
*
* @author Oliver Gierke
* @author John Blum
*/
class GemfireQueryCreator extends AbstractQueryCreator<QueryString, Predicates> {
private static final Log LOG = LogFactory.getLog(GemfireQueryCreator.class);
private Iterator<Integer> indexes;
private final QueryBuilder queryBuilder;
/**
* Creates a new {@link GemfireQueryCreator} using the given {@link PartTree} and domain class.
*
* @param tree must not be {@literal null}.
* @param entity must not be {@literal null}.
*/
public GemfireQueryCreator(PartTree tree, GemfirePersistentEntity<?> entity) {
super(tree);
this.queryBuilder = new QueryBuilder(entity, tree);
this.indexes = new IndexProvider();
}
/*
* (non-Javadoc)
* @see org.springframework.data.repository.query.parser.AbstractQueryCreator#createQuery(org.springframework.data.domain.Sort)
*/
@Override
public QueryString createQuery(Sort dynamicSort) {
this.indexes = new IndexProvider();
return super.createQuery(dynamicSort);
}
/*
* (non-Javadoc)
* @see org.springframework.data.repository.query.parser.AbstractQueryCreator#create(org.springframework.data.repository.query.parser.Part, java.util.Iterator)
*/
@Override
protected Predicates create(Part part, Iterator<Object> iterator) {
return Predicates.create(part, this.indexes);
}
/*
* (non-Javadoc)
* @see org.springframework.data.repository.query.parser.AbstractQueryCreator#and(org.springframework.data.repository.query.parser.Part, java.lang.Object, java.util.Iterator)
*/
@Override
protected Predicates and(Part part, Predicates base, Iterator<Object> iterator) {
return base.and(Predicates.create(part, this.indexes));
}
/*
* (non-Javadoc)
* @see org.springframework.data.repository.query.parser.AbstractQueryCreator#or(java.lang.Object, java.lang.Object)
*/
@Override
protected Predicates or(Predicates base, Predicates criteria) {
return base.or(criteria);
}
/*
* (non-Javadoc)
* @see org.springframework.data.repository.query.parser.AbstractQueryCreator#complete(java.lang.Object, org.springframework.data.domain.Sort)
*/
@Override
protected QueryString complete(Predicates criteria, Sort sort) {
QueryString query = queryBuilder.create(criteria).orderBy(sort);
if (LOG.isDebugEnabled()) {
LOG.debug(String.format("Created Query [%s]", query.toString()));
}
return query;
}
/**
* {@link IndexProvider} is an {@link Iterator} providing sequentially numbered placeholders (starting at 1),
* in a generated GemFire OQL statement corresponding to all possible arguments passed to
* the query's indexed parameters.
*
* @see java.util.Iterator
*/
private static class IndexProvider implements Iterator<Integer> {
private int index;
public IndexProvider() {
this.index = 1;
}
/*
* (non-Javadoc)
* @see java.util.Iterator#hasNext()
*/
@Override
@SuppressWarnings("all")
public boolean hasNext() {
return (index <= Integer.MAX_VALUE);
}
/*
* (non-Javadoc)
* @see java.util.Iterator#next()
*/
@Override
public Integer next() {
return index++;
}
/*
* (non-Javadoc)
* @see java.util.Iterator#remove()
*/
@Override
public void remove() {
throw new UnsupportedOperationException();
}
}
}