com.blazebit.persistence.parser.expression.ExpressionCache Maven / Gradle / Ivy
/*
* Copyright 2014 - 2021 Blazebit.
*
* 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 com.blazebit.persistence.parser.expression;
import java.util.Objects;
/**
*
* @author Christian Beikov
* @since 1.2.0
*/
public interface ExpressionCache {
public T get(String cacheName, Key key);
public T putIfAbsent(String cacheName, Key key, T value);
/**
*
* @author Moritz Becker
* @since 1.4.0
*/
class Key {
private static final byte ALLOW_OUTER_MASK = 1;
private static final byte ALLOW_QUANTIFIED_PREDICATES_MASK = (1 << 1);
private static final byte ALLOW_OBJECT_EXPRESSION_MASK = (1 << 2);
private final String expression;
private final byte flags;
public Key(String expression, boolean allowOuter, boolean allowQuantifiedPredicates, boolean allowObjectExpression) {
this.expression = expression;
byte flags = 0;
if (allowOuter) {
flags |= ALLOW_OUTER_MASK;
}
if (allowQuantifiedPredicates) {
flags |= ALLOW_QUANTIFIED_PREDICATES_MASK;
}
if (allowObjectExpression) {
flags |= ALLOW_OBJECT_EXPRESSION_MASK;
}
this.flags = flags;
}
public boolean isAllowOuter() {
return (flags & ALLOW_OUTER_MASK) != 0;
}
public boolean isAllowQuantifiedPredicates() {
return (flags & ALLOW_QUANTIFIED_PREDICATES_MASK) != 0;
}
public boolean isAllowObjectExpression() {
return (flags & ALLOW_OBJECT_EXPRESSION_MASK) != 0;
}
@Override
public boolean equals(Object o) {
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
Key key = (Key) o;
return flags == key.flags &&
expression.equals(key.expression);
}
@Override
public int hashCode() {
return Objects.hash(expression, flags);
}
}
}