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The Apache Cassandra Project develops a highly scalable second-generation distributed database, bringing together Dynamo's fully distributed design and Bigtable's ColumnFamily-based data model.
/*
* 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.ArrayList;
import java.util.List;
import org.apache.cassandra.schema.TableMetadata;
import org.apache.cassandra.cql3.restrictions.Restriction;
import org.apache.cassandra.cql3.statements.Bound;
import org.apache.cassandra.exceptions.InvalidRequestException;
import static org.apache.cassandra.cql3.statements.RequestValidations.invalidRequest;
public abstract class Relation
{
protected Operator relationType;
public Operator operator()
{
return relationType;
}
/**
* Returns the raw value for this relation, or null if this is an IN relation.
*/
public abstract Term.Raw getValue();
/**
* Returns the list of raw IN values for this relation, or null if this is not an IN relation.
*/
public abstract List getInValues();
/**
* Checks if this relation apply to multiple columns.
*
* @return true if this relation apply to multiple columns, false otherwise.
*/
public boolean isMultiColumn()
{
return false;
}
/**
* Checks if this relation is a token relation (e.g. token(a) = token(1)
).
*
* @return true if this relation is a token relation, false otherwise.
*/
public boolean onToken()
{
return false;
}
/**
* Checks if the operator of this relation is a CONTAINS.
* @return true if the operator of this relation is a CONTAINS, false
* otherwise.
*/
public final boolean isContains()
{
return relationType == Operator.CONTAINS;
}
/**
* Checks if the operator of this relation is a CONTAINS_KEY.
* @return true if the operator of this relation is a CONTAINS_KEY, false
* otherwise.
*/
public final boolean isContainsKey()
{
return relationType == Operator.CONTAINS_KEY;
}
/**
* Checks if the operator of this relation is a IN.
* @return true if the operator of this relation is a IN, false
* otherwise.
*/
public final boolean isIN()
{
return relationType == Operator.IN;
}
/**
* Checks if the operator of this relation is a EQ.
* @return true if the operator of this relation is a EQ, false
* otherwise.
*/
public final boolean isEQ()
{
return relationType == Operator.EQ;
}
public final boolean isLIKE()
{
return relationType == Operator.LIKE_PREFIX
|| relationType == Operator.LIKE_SUFFIX
|| relationType == Operator.LIKE_CONTAINS
|| relationType == Operator.LIKE_MATCHES
|| relationType == Operator.LIKE;
}
/**
* Checks if the operator of this relation is a Slice (GT, GTE, LTE, LT).
*
* @return true if the operator of this relation is a Slice, false otherwise.
*/
public final boolean isSlice()
{
return relationType == Operator.GT
|| relationType == Operator.GTE
|| relationType == Operator.LTE
|| relationType == Operator.LT;
}
/**
* Converts this Relation into a Restriction.
*
* @param table the Column Family meta data
* @param boundNames the variables specification where to collect the bind variables
* @return the Restriction corresponding to this Relation
* @throws InvalidRequestException if this Relation is not valid
*/
public final Restriction toRestriction(TableMetadata table, VariableSpecifications boundNames)
{
switch (relationType)
{
case EQ: return newEQRestriction(table, boundNames);
case LT: return newSliceRestriction(table, boundNames, Bound.END, false);
case LTE: return newSliceRestriction(table, boundNames, Bound.END, true);
case GTE: return newSliceRestriction(table, boundNames, Bound.START, true);
case GT: return newSliceRestriction(table, boundNames, Bound.START, false);
case IN: return newINRestriction(table, boundNames);
case CONTAINS: return newContainsRestriction(table, boundNames, false);
case CONTAINS_KEY: return newContainsRestriction(table, boundNames, true);
case IS_NOT: return newIsNotRestriction(table, boundNames);
case LIKE_PREFIX:
case LIKE_SUFFIX:
case LIKE_CONTAINS:
case LIKE_MATCHES:
case LIKE:
return newLikeRestriction(table, boundNames, relationType);
default: throw invalidRequest("Unsupported \"!=\" relation: %s", this);
}
}
/**
* Creates a new EQ restriction instance.
*
* @param table the table meta data
* @param boundNames the variables specification where to collect the bind variables
* @return a new EQ restriction instance.
* @throws InvalidRequestException if the relation cannot be converted into an EQ restriction.
*/
protected abstract Restriction newEQRestriction(TableMetadata table, VariableSpecifications boundNames);
/**
* Creates a new IN restriction instance.
*
* @param table the table meta data
* @param boundNames the variables specification where to collect the bind variables
* @return a new IN restriction instance
* @throws InvalidRequestException if the relation cannot be converted into an IN restriction.
*/
protected abstract Restriction newINRestriction(TableMetadata table, VariableSpecifications boundNames);
/**
* Creates a new Slice restriction instance.
*
* @param table the table meta data
* @param boundNames the variables specification where to collect the bind variables
* @param bound the slice bound
* @param inclusive true if the bound is included.
* @return a new slice restriction instance
* @throws InvalidRequestException if the Relation is not valid
*/
protected abstract Restriction newSliceRestriction(TableMetadata table,
VariableSpecifications boundNames,
Bound bound,
boolean inclusive);
/**
* Creates a new Contains restriction instance.
*
* @param table the table meta data
* @param boundNames the variables specification where to collect the bind variables
* @param isKey true if the restriction to create is a CONTAINS KEY
* @return a new Contains Restriction instance
* @throws InvalidRequestException if the Relation is not valid
*/
protected abstract Restriction newContainsRestriction(TableMetadata table, VariableSpecifications boundNames, boolean isKey);
protected abstract Restriction newIsNotRestriction(TableMetadata table, VariableSpecifications boundNames);
protected abstract Restriction newLikeRestriction(TableMetadata table, VariableSpecifications boundNames, Operator operator);
/**
* Converts the specified Raw into a Term.
* @param receivers the columns to which the values must be associated at
* @param raw the raw term to convert
* @param keyspace the keyspace name
* @param boundNames the variables specification where to collect the bind variables
*
* @return the Term corresponding to the specified Raw
* @throws InvalidRequestException if the Raw term is not valid
*/
protected abstract Term toTerm(List receivers,
Term.Raw raw,
String keyspace,
VariableSpecifications boundNames);
/**
* Converts the specified Raw terms into a Terms.
* @param receivers the columns to which the values must be associated at
* @param raws the raw terms to convert
* @param keyspace the keyspace name
* @param boundNames the variables specification where to collect the bind variables
*
* @return the Terms corresponding to the specified Raw terms
* @throws InvalidRequestException if the Raw terms are not valid
*/
protected final List toTerms(List receivers,
List raws,
String keyspace,
VariableSpecifications boundNames)
{
if (raws == null)
return null;
List terms = new ArrayList<>(raws.size());
for (int i = 0, m = raws.size(); i < m; i++)
terms.add(toTerm(receivers, raws.get(i), keyspace, boundNames));
return terms;
}
/**
* Renames an identifier in this Relation, if applicable.
* @param from the old identifier
* @param to the new identifier
* @return this object, if the old identifier is not in the set of entities that this relation covers; otherwise
* a new Relation with "from" replaced by "to" is returned.
*/
public abstract Relation renameIdentifier(ColumnIdentifier from, ColumnIdentifier to);
/**
* Returns a CQL representation of this relation.
*
* @return a CQL representation of this relation
*/
public abstract String toCQLString();
@Override
public String toString()
{
return toCQLString();
}
}