Import cql3 package and sub-packages

Contains the cql3 grammer and supporting classes, which will be converted
one by one.

From commit bf599fb5b062cbcc652da78b7d699e7a01b949ad.

cql3/VariableSpecifications.java

@@ -0,0 +1,68 @@
+/*
+ * 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;
+
+public class VariableSpecifications
+{
+    private final List<ColumnIdentifier> variableNames;
+    private final ColumnSpecification[] specs;
+
+    public VariableSpecifications(List<ColumnIdentifier> variableNames)
+    {
+        this.variableNames = variableNames;
+        this.specs = new ColumnSpecification[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.<ColumnIdentifier> emptyList());
+    }
+
+    public int size()
+    {
+        return variableNames.size();
+    }
+
+    public List<ColumnSpecification> getSpecifications()
+    {
+        return Arrays.asList(specs);
+    }
+
+    public void add(int bindIndex, ColumnSpecification spec)
+    {
+        ColumnIdentifier name = variableNames.get(bindIndex);
+        // Use the user name, if there is one
+        if (name != null)
+            spec = new ColumnSpecification(spec.ksName, spec.cfName, name, spec.type);
+        specs[bindIndex] = spec;
+    }
+
+    @Override
+    public String toString()
+    {
+        return Arrays.toString(specs);
+    }
+}