org.apache.jackrabbit.oak.jcr.query.QueryResultImpl 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.jackrabbit.oak.jcr.query;
import java.util.Arrays;
import java.util.Iterator;
import java.util.NoSuchElementException;
import javax.jcr.NodeIterator;
import javax.jcr.RepositoryException;
import javax.jcr.Value;
import javax.jcr.query.QueryResult;
import javax.jcr.query.RowIterator;
import org.apache.jackrabbit.commons.iterator.NodeIteratorAdapter;
import org.apache.jackrabbit.commons.iterator.RowIteratorAdapter;
import org.apache.jackrabbit.oak.api.PropertyState;
import org.apache.jackrabbit.oak.api.PropertyValue;
import org.apache.jackrabbit.oak.api.Result;
import org.apache.jackrabbit.oak.api.ResultRow;
import org.apache.jackrabbit.oak.api.Tree;
import org.apache.jackrabbit.oak.jcr.query.PrefetchIterator.PrefetchOptions;
import org.apache.jackrabbit.oak.jcr.session.NodeImpl;
import org.apache.jackrabbit.oak.jcr.session.SessionContext;
import org.apache.jackrabbit.oak.jcr.delegate.NodeDelegate;
import org.apache.jackrabbit.oak.jcr.delegate.SessionDelegate;
import org.apache.jackrabbit.oak.plugins.memory.PropertyValues;
import org.apache.jackrabbit.oak.plugins.value.jcr.PartialValueFactory;
import org.jetbrains.annotations.Nullable;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* The implementation of the corresponding JCR interface.
*/
public class QueryResultImpl implements QueryResult {
private static final Logger queryOpsLogger = LoggerFactory.getLogger("org.apache.jackrabbit.oak.jcr.operations.query");
static final Logger LOG = LoggerFactory.getLogger(QueryResultImpl.class);
protected final SessionContext sessionContext;
final Result result;
private final SessionDelegate sessionDelegate;
private final PartialValueFactory valueFactory;
public QueryResultImpl(SessionContext sessionContext, Result result) {
this.sessionContext = sessionContext;
this.sessionDelegate = sessionContext.getSessionDelegate();
this.result = result;
this.valueFactory = new PartialValueFactory(sessionContext, sessionContext.getBlobAccessProvider());
}
@Override
public String[] getColumnNames() throws RepositoryException {
return result.getColumnNames();
}
@Override
public String[] getSelectorNames() {
return result.getSelectorNames();
}
@Override
public RowIterator getRows() throws RepositoryException {
Iterator rowIterator = new Iterator() {
private final Iterator it = result.getRows().iterator();
private final String pathSelector;
private RowImpl current;
private int rowCount;
//Avoid log check for every row access
private final boolean debugEnabled = queryOpsLogger.isDebugEnabled();
{
String[] columnSelectorNames = result.getColumnSelectorNames();
if (columnSelectorNames.length == 1) {
pathSelector = columnSelectorNames[0];
} else {
pathSelector = null;
}
fetch();
}
private void fetch() {
if (it.hasNext()) {
current = new RowImpl(
QueryResultImpl.this, it.next(), pathSelector);
if (debugEnabled) {
rowCount++;
if (rowCount % 100 == 0) {
queryOpsLogger.debug("Iterated over [{}] results so far", rowCount);
}
}
} else {
current = null;
}
}
@Override
public boolean hasNext() {
return current != null;
}
@Override
public RowImpl next() {
if (current == null) {
throw new NoSuchElementException();
}
RowImpl r = current;
fetch();
return r;
}
@Override
public void remove() {
throw new UnsupportedOperationException();
}
};
final PrefetchIterator prefIt = new PrefetchIterator(
sessionDelegate.sync(rowIterator),
new PrefetchOptions() { {
size = result.getSize();
fastSize = sessionContext.getFastQueryResultSize();
fastSizeCallback = result;
} });
return new RowIteratorAdapter(prefIt) {
@Override
public long getSize() {
return prefIt.size();
}
};
}
@Nullable
NodeImpl getNode(Tree tree) throws RepositoryException {
if (tree != null && tree.exists()) {
NodeDelegate node = new NodeDelegate(sessionDelegate, tree);
return NodeImpl.createNode(node, sessionContext);
}
return null;
}
@Override
public NodeIterator getNodes() throws RepositoryException {
String[] columnSelectorNames = result.getColumnSelectorNames();
if (columnSelectorNames.length != 1) {
throw new RepositoryException("Query contains more than one selector: " +
Arrays.toString(columnSelectorNames));
}
final String selectorName = columnSelectorNames[0];
if (selectorName == null) {
throw new RepositoryException("Query does not contain a selector: " +
Arrays.toString(columnSelectorNames));
}
Iterator> nodeIterator =
new Iterator>() {
private final Iterator it = result.getRows().iterator();
private NodeImpl current;
{
fetch();
}
private void fetch() {
current = null;
while (it.hasNext()) {
ResultRow r = it.next();
Tree tree = r.getTree(selectorName);
if (tree != null && tree.exists()) {
try {
current = getNode(tree);
break;
} catch (RepositoryException e) {
LOG.warn("Unable to fetch result node for path "
+ tree.getPath(), e);
}
}
}
}
@Override
public boolean hasNext() {
return current != null;
}
@Override
public NodeImpl next() {
if (current == null) {
throw new NoSuchElementException();
}
NodeImpl n = current;
fetch();
return n;
}
@Override
public void remove() {
throw new UnsupportedOperationException();
}
};
final PrefetchIterator> prefIt =
new PrefetchIterator>(
sessionDelegate.sync(nodeIterator),
new PrefetchOptions() { {
size = result.getSize();
fastSize = sessionContext.getFastQueryResultSize();
fastSizeCallback = result;
} });
return new NodeIteratorAdapter(prefIt) {
@Override
public long getSize() {
return prefIt.size();
}
};
}
Value createValue(PropertyValue value) {
if (value == null) {
return null;
}
PropertyState state = PropertyValues.create(value);
if (state == null) {
throw new IllegalArgumentException("Failed to convert the specified property value to a property state.");
}
return valueFactory.createValue(state);
}
}