| /* |
| * 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.Arrays; |
| import java.util.Collections; |
| import java.util.List; |
| |
| import org.apache.cassandra.schema.ColumnMetadata; |
| import org.apache.cassandra.schema.TableMetadata; |
| |
| public class VariableSpecifications |
| { |
| private final List<ColumnIdentifier> variableNames; |
| private final List<ColumnSpecification> specs; |
| private final ColumnMetadata[] targetColumns; |
| |
| public VariableSpecifications(List<ColumnIdentifier> variableNames) |
| { |
| this.variableNames = variableNames; |
| this.specs = Arrays.asList(new ColumnSpecification[variableNames.size()]); |
| this.targetColumns = new ColumnMetadata[variableNames.size()]; |
| } |
| |
| /** |
| * Returns an empty instance of <code>VariableSpecifications</code>. |
| * @return an empty instance of <code>VariableSpecifications</code> |
| */ |
| public static VariableSpecifications empty() |
| { |
| return new VariableSpecifications(Collections.emptyList()); |
| } |
| |
| public boolean isEmpty() |
| { |
| return variableNames.isEmpty(); |
| } |
| |
| public List<ColumnSpecification> getBindVariables() |
| { |
| return specs; |
| } |
| |
| /** |
| * Returns an array with the same length as the number of partition key columns for the table corresponding |
| * to table. Each short in the array represents the bind index of the marker that holds the value for that |
| * partition key column. If there are no bind markers for any of the partition key columns, null is returned. |
| * |
| * Callers of this method should ensure that all statements operate on the same table. |
| */ |
| public short[] getPartitionKeyBindVariableIndexes(TableMetadata metadata) |
| { |
| short[] partitionKeyPositions = new short[metadata.partitionKeyColumns().size()]; |
| boolean[] set = new boolean[partitionKeyPositions.length]; |
| for (int i = 0; i < targetColumns.length; i++) |
| { |
| ColumnMetadata targetColumn = targetColumns[i]; |
| if (targetColumn != null && targetColumn.isPartitionKey()) |
| { |
| assert targetColumn.ksName.equals(metadata.keyspace) && targetColumn.cfName.equals(metadata.name); |
| partitionKeyPositions[targetColumn.position()] = (short) i; |
| set[targetColumn.position()] = true; |
| } |
| } |
| |
| for (boolean b : set) |
| if (!b) |
| return null; |
| |
| return partitionKeyPositions; |
| } |
| |
| public void add(int bindIndex, ColumnSpecification spec) |
| { |
| if (spec instanceof ColumnMetadata) |
| targetColumns[bindIndex] = (ColumnMetadata) spec; |
| |
| ColumnIdentifier bindMarkerName = variableNames.get(bindIndex); |
| // Use the user name, if there is one |
| if (bindMarkerName != null) |
| spec = new ColumnSpecification(spec.ksName, spec.cfName, bindMarkerName, spec.type); |
| specs.set(bindIndex, spec); |
| } |
| |
| @Override |
| public String toString() |
| { |
| return specs.toString(); |
| } |
| } |