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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.query.ast;
import static org.apache.jackrabbit.oak.api.Type.STRING;
import static org.apache.jackrabbit.oak.api.Type.STRINGS;
import java.text.ParseException;
import java.util.Collections;
import java.util.Set;
import org.apache.jackrabbit.oak.api.PropertyState;
import org.apache.jackrabbit.oak.api.PropertyValue;
import org.apache.jackrabbit.oak.api.Tree;
import org.apache.jackrabbit.oak.api.Type;
import org.apache.jackrabbit.oak.commons.PathUtils;
import org.apache.jackrabbit.oak.query.fulltext.FullTextContains;
import org.apache.jackrabbit.oak.query.fulltext.FullTextExpression;
import org.apache.jackrabbit.oak.query.fulltext.FullTextParser;
import org.apache.jackrabbit.oak.query.index.FilterImpl;
import org.apache.jackrabbit.oak.spi.query.PropertyValues;
import org.apache.jackrabbit.oak.spi.query.QueryIndex.FulltextQueryIndex;
/**
* A fulltext "contains(...)" condition.
*/
public class FullTextSearchImpl extends ConstraintImpl {
/**
* Compatibility for Jackrabbit 2.0 single quoted phrase queries.
* (contains(., "word ''hello world'' word")
* These are queries that delimit a phrase with a single quote
* instead, as in the spec, using double quotes.
*/
public static final boolean JACKRABBIT_2_SINGLE_QUOTED_PHRASE = true;
final String selectorName;
private final String relativePath;
final String propertyName;
final StaticOperandImpl fullTextSearchExpression;
private SelectorImpl selector;
public FullTextSearchImpl(
String selectorName, String propertyName,
StaticOperandImpl fullTextSearchExpression) {
this.selectorName = selectorName;
int slash = -1;
if (propertyName != null) {
slash = propertyName.lastIndexOf('/');
}
if (slash == -1) {
this.relativePath = null;
} else {
this.relativePath = propertyName.substring(0, slash);
propertyName = propertyName.substring(slash + 1);
}
if (propertyName == null || "*".equals(propertyName)) {
this.propertyName = null;
} else {
this.propertyName = propertyName;
}
this.fullTextSearchExpression = fullTextSearchExpression;
}
public StaticOperandImpl getFullTextSearchExpression() {
return fullTextSearchExpression;
}
@Override
ConstraintImpl not() {
return new NotFullTextSearchImpl(this);
}
@Override
boolean accept(AstVisitor v) {
return v.visit(this);
}
@Override
public String toString() {
StringBuilder builder = new StringBuilder();
builder.append("contains(");
builder.append(quote(selectorName));
builder.append('.');
String pn = propertyName;
if (pn == null) {
pn = "*";
}
if (relativePath != null) {
pn = relativePath + "/" + pn;
}
builder.append(quote(pn));
builder.append(", ");
builder.append(getFullTextSearchExpression());
builder.append(')');
return builder.toString();
}
@Override
public Set getPropertyExistenceConditions() {
if (propertyName == null) {
return Collections.emptySet();
}
String fullName;
if (relativePath != null) {
fullName = PathUtils.concat(relativePath, propertyName);
} else {
fullName = propertyName;
}
return Collections.singleton(new PropertyExistenceImpl(selector, selectorName, fullName));
}
@Override
public FullTextExpression getFullTextConstraint(SelectorImpl s) {
if (!s.equals(selector)) {
return null;
}
PropertyValue v = fullTextSearchExpression.currentValue();
try {
String p = propertyName;
if (relativePath != null) {
if (p == null) {
p = "*";
}
p = PathUtils.concat(relativePath, p);
}
String p2 = normalizePropertyName(p);
String rawText = getRawText(v);
FullTextExpression e = FullTextParser.parse(p2, rawText);
return new FullTextContains(p2, rawText, e);
} catch (ParseException e) {
throw new IllegalArgumentException("Invalid expression: " + fullTextSearchExpression, e);
}
}
String getRawText(PropertyValue v) {
return v.getValue(Type.STRING);
}
@Override
public Set getSelectors() {
return Collections.singleton(selector);
}
/**
* verify that a property exists in the node. {@code property IS NOT NULL}
*
* @param propertyName the property to check
* @param selector the selector to work with
* @return true if the property is there, false otherwise.
*/
boolean enforcePropertyExistence(String propertyName, SelectorImpl selector) {
PropertyValue p = selector.currentProperty(propertyName);
if (p == null) {
return false;
}
return true;
}
@Override
public boolean evaluate() {
// disable evaluation if a fulltext index is used,
// to avoid running out of memory if the node is large,
// and because we might not implement all features
// such as index aggregation
if (selector.getIndex() instanceof FulltextQueryIndex) {
// first verify if a property level condition exists and if that
// condition checks out, this takes out some extra rows from the index
// aggregation bits
if (relativePath == null && propertyName != null) {
return enforcePropertyExistence(propertyName, selector);
}
return true;
}
// OAK-2050
if (!query.getSettings().getFullTextComparisonWithoutIndex()) {
return false;
}
StringBuilder buff = new StringBuilder();
if (relativePath == null && propertyName != null) {
PropertyValue p = selector.currentProperty(propertyName);
if (p == null) {
return false;
}
appendString(buff, p);
} else {
String path = selector.currentPath();
if (!PathUtils.denotesRoot(path)) {
appendString(buff,
PropertyValues.newString(PathUtils.getName(path)));
}
if (relativePath != null) {
String rp = normalizePath(relativePath);
path = PathUtils.concat(path, rp);
}
Tree tree = selector.getTree(path);
if (tree == null || !tree.exists()) {
return false;
}
if (propertyName != null) {
String pn = normalizePropertyName(propertyName);
PropertyState p = tree.getProperty(pn);
if (p == null) {
return false;
}
appendString(buff, PropertyValues.create(p));
} else {
for (PropertyState p : tree.getProperties()) {
appendString(buff, PropertyValues.create(p));
}
}
}
return getFullTextConstraint(selector).evaluate(buff.toString());
}
@Override
public boolean evaluateStop() {
// if a fulltext index is used, then we are fine
if (selector.getIndex() instanceof FulltextQueryIndex) {
return false;
}
// OAK-2050
if (!query.getSettings().getFullTextComparisonWithoutIndex()) {
return true;
}
return false;
}
private static void appendString(StringBuilder buff, PropertyValue p) {
if (p.isArray()) {
if (p.getType() == Type.BINARIES) {
// OAK-2050: don't try to load binaries as this would
// run out of memory
} else {
for (String v : p.getValue(STRINGS)) {
buff.append(v).append(' ');
}
}
} else {
if (p.getType() == Type.BINARY) {
// OAK-2050: don't try to load binaries as this would
// run out of memory
} else {
buff.append(p.getValue(STRING)).append(' ');
}
}
}
public void bindSelector(SourceImpl source) {
selector = source.getExistingSelector(selectorName);
}
@Override
public void restrict(FilterImpl f) {
f.restrictFulltextCondition(fullTextSearchExpression.currentValue().getValue(Type.STRING));
}
@Override
public void restrictPushDown(SelectorImpl s) {
if (s.equals(selector)) {
selector.restrictSelector(this);
}
}
/**
* restrict the provided property to the property to the provided filter achieving so
* {@code property IS NOT NULL}
*
* @param propertyName
* @param f
*/
void restrictPropertyOnFilter(String propertyName, FilterImpl f) {
f.restrictProperty(propertyName, Operator.NOT_EQUAL, null);
}
@Override
public AstElement copyOf() {
return new FullTextSearchImpl(selectorName, propertyName, fullTextSearchExpression);
}
@Override
public boolean requiresFullTextIndex() {
return true;
}
}
