792f606a64
Contains the cql3 grammer and supporting classes, which will be converted one by one. From commit bf599fb5b062cbcc652da78b7d699e7a01b949ad.
73 lines
2.7 KiB
Java
73 lines
2.7 KiB
Java
/*
|
|
* 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.cassandra.cql3;
|
|
|
|
import java.util.Collection;
|
|
|
|
public interface AssignmentTestable
|
|
{
|
|
/**
|
|
* @return whether this object can be assigned to the provided receiver. We distinguish
|
|
* between 3 values:
|
|
* - EXACT_MATCH if this object is exactly of the type expected by the receiver
|
|
* - WEAKLY_ASSIGNABLE if this object is not exactly the expected type but is assignable nonetheless
|
|
* - NOT_ASSIGNABLE if it's not assignable
|
|
* Most caller should just call the isAssignable() method on the result, though functions have a use for
|
|
* testing "strong" equality to decide the most precise overload to pick when multiple could match.
|
|
*/
|
|
public TestResult testAssignment(String keyspace, ColumnSpecification receiver);
|
|
|
|
public enum TestResult
|
|
{
|
|
EXACT_MATCH, WEAKLY_ASSIGNABLE, NOT_ASSIGNABLE;
|
|
|
|
public boolean isAssignable()
|
|
{
|
|
return this != NOT_ASSIGNABLE;
|
|
}
|
|
|
|
public boolean isExactMatch()
|
|
{
|
|
return this == EXACT_MATCH;
|
|
}
|
|
|
|
// Test all elements of toTest for assignment. If all are exact match, return exact match. If any is not assignable,
|
|
// return not assignable. Otherwise, return weakly assignable.
|
|
public static TestResult testAll(String keyspace, ColumnSpecification receiver, Collection<? extends AssignmentTestable> toTest)
|
|
{
|
|
TestResult res = EXACT_MATCH;
|
|
for (AssignmentTestable rt : toTest)
|
|
{
|
|
if (rt == null)
|
|
{
|
|
res = WEAKLY_ASSIGNABLE;
|
|
continue;
|
|
}
|
|
|
|
TestResult t = rt.testAssignment(keyspace, receiver);
|
|
if (t == NOT_ASSIGNABLE)
|
|
return NOT_ASSIGNABLE;
|
|
|
|
if (t == WEAKLY_ASSIGNABLE)
|
|
res = WEAKLY_ASSIGNABLE;
|
|
}
|
|
return res;
|
|
}
|
|
}
|
|
}
|