| /* |
| * 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 java.util.Collections; |
| import java.util.Set; |
| |
| import org.apache.jackrabbit.oak.query.index.FilterImpl; |
| |
| /** |
| * A condition to check if the property exists ("is not null"). |
| */ |
| public class PropertyExistenceImpl extends ConstraintImpl { |
| |
| private final String selectorName; |
| private final String propertyName; |
| private SelectorImpl selector; |
| |
| public PropertyExistenceImpl(SelectorImpl selector, String selectorName, String propertyName) { |
| this.selector = selector; |
| this.selectorName = selectorName; |
| this.propertyName = propertyName; |
| } |
| |
| public PropertyExistenceImpl(String selectorName, String propertyName) { |
| this.selectorName = selectorName; |
| this.propertyName = propertyName; |
| } |
| |
| @Override |
| public boolean evaluate() { |
| return selector.currentProperty(propertyName) != null; |
| } |
| |
| @Override |
| public Set<PropertyExistenceImpl> getPropertyExistenceConditions() { |
| return Collections.singleton(this); |
| } |
| |
| @Override |
| public Set<SelectorImpl> getSelectors() { |
| return Collections.singleton(selector); |
| } |
| |
| @Override |
| boolean accept(AstVisitor v) { |
| return v.visit(this); |
| } |
| |
| @Override |
| public String toString() { |
| return quote(selectorName) + '.' + quote(propertyName) + " is not null"; |
| } |
| |
| public void bindSelector(SourceImpl source) { |
| selector = source.getExistingSelector(selectorName); |
| } |
| |
| @Override |
| public void restrict(FilterImpl f) { |
| if (f.getSelector().equals(selector)) { |
| String pn = normalizePropertyName(propertyName); |
| f.restrictProperty(pn, Operator.NOT_EQUAL, null); |
| } |
| } |
| |
| @Override |
| public void restrictPushDown(SelectorImpl s) { |
| if (s.equals(selector)) { |
| s.restrictSelector(this); |
| } |
| } |
| |
| @Override |
| public int hashCode() { |
| String pn = normalizePropertyName(propertyName); |
| return ((selectorName == null) ? 0 : selectorName.hashCode()) * 31 + |
| ((pn == null) ? 0 : pn.hashCode()); |
| } |
| |
| @Override |
| public boolean equals(Object obj) { |
| if (this == obj) { |
| return true; |
| } else if (obj == null || getClass() != obj.getClass()) { |
| return false; |
| } |
| PropertyExistenceImpl other = (PropertyExistenceImpl) obj; |
| if (!equalsStrings(selectorName, other.selectorName)) { |
| return false; |
| } |
| String pn = normalizePropertyName(propertyName); |
| String pn2 = normalizePropertyName(other.propertyName); |
| return equalsStrings(pn, pn2); |
| } |
| |
| private static boolean equalsStrings(String a, String b) { |
| return a == null || b == null ? a == b : a.equals(b); |
| } |
| |
| @Override |
| public AstElement copyOf() { |
| return new PropertyExistenceImpl(selectorName, propertyName); |
| } |
| } |