org.apache.jackrabbit.oak.query.ast.SameNodeJoinConditionImpl 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.ast;
import org.apache.jackrabbit.oak.commons.PathUtils;
import org.apache.jackrabbit.oak.query.index.FilterImpl;
import org.apache.jackrabbit.oak.spi.query.Filter;
/**
* The "issamenode(...)" join condition.
*/
public class SameNodeJoinConditionImpl extends JoinConditionImpl {
private final String selector1Name;
private final String selector2Name;
private final String selector2Path;
private SelectorImpl selector1;
private SelectorImpl selector2;
public SameNodeJoinConditionImpl(String selector1Name, String selector2Name,
String selector2Path) {
this.selector1Name = selector1Name;
this.selector2Name = selector2Name;
this.selector2Path = selector2Path;
}
@Override
boolean accept(AstVisitor v) {
return v.visit(this);
}
@Override
public String toString() {
StringBuilder builder = new StringBuilder();
builder.append("issamenode(");
builder.append(quote(selector1Name));
builder.append(", ");
builder.append(quote(selector2Name));
if (selector2Path != null) {
builder.append(", ");
builder.append(quote(selector2Path));
}
builder.append(')');
return builder.toString();
}
public void bindSelector(SourceImpl source) {
selector1 = source.getExistingSelector(selector1Name);
selector2 = source.getExistingSelector(selector2Name);
}
@Override
public boolean evaluate() {
String p1 = selector1.currentPath();
String p2 = selector2.currentPath();
if (selector2Path.equals(".")) {
return p1.equals(p2);
}
String pn = normalizePath(selector2Path);
String p = PathUtils.concat(p2, pn);
return p.equals(p1);
}
@Override
public void restrict(FilterImpl f) {
if (f.getSelector() == selector1) {
String p2 = selector2.currentPath();
if (p2 == null && f.isPreparing() && selector2.isPrepared()) {
// during the prepare phase, if the selector is already
// prepared, then we would know the value
p2 = KNOWN_PATH;
}
if (p2 != null) {
if (selector2Path.equals(".")) {
f.restrictPath(p2, Filter.PathRestriction.EXACT);
} else {
String pn = normalizePath(selector2Path);
String p = PathUtils.concat(p2, pn);
f.restrictPath(p, Filter.PathRestriction.EXACT);
}
}
}
if (f.getSelector() == selector2) {
String p1 = selector1.currentPath();
if (p1 == null && f.isPreparing() && selector1.isPrepared()) {
// during the prepare phase, if the selector is already
// prepared, then we would know the value
p1 = KNOWN_PATH;
}
if (p1 != null) {
if (selector2Path.equals(".")) {
f.restrictPath(p1, Filter.PathRestriction.EXACT);
}
}
}
}
@Override
public void restrictPushDown(SelectorImpl s) {
// nothing to do
}
@Override
public boolean isParent(SourceImpl source) {
return false;
}
}