| /* |
| * 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.drill.exec.expr.fn.impl; |
| |
| import io.netty.buffer.DrillBuf; |
| |
| import java.nio.charset.Charset; |
| |
| import javax.inject.Inject; |
| |
| import org.apache.drill.exec.expr.DrillSimpleFunc; |
| import org.apache.drill.exec.expr.annotations.FunctionTemplate; |
| import org.apache.drill.exec.expr.annotations.FunctionTemplate.NullHandling; |
| import org.apache.drill.exec.expr.annotations.Output; |
| import org.apache.drill.exec.expr.annotations.Param; |
| import org.apache.drill.exec.expr.annotations.Workspace; |
| import org.apache.drill.exec.expr.holders.BigIntHolder; |
| import org.apache.drill.exec.expr.holders.Var16CharHolder; |
| import org.apache.drill.exec.expr.holders.VarCharHolder; |
| |
| @SuppressWarnings("unused") |
| @FunctionTemplate(names = {"castVAR16CHAR", "to_var16char", "to_string"}, scope = FunctionTemplate.FunctionScope.SIMPLE, nulls= NullHandling.NULL_IF_NULL, |
| outputWidthCalculatorType = FunctionTemplate.OutputWidthCalculatorType.CUSTOM_CLONE_DEFAULT) |
| public class CastVarCharVar16Char implements DrillSimpleFunc { |
| @Param VarCharHolder in; |
| @Param BigIntHolder length; |
| @Output Var16CharHolder out; |
| @Workspace Charset charset; |
| @Inject DrillBuf buffer; |
| |
| @Override |
| public void setup() { |
| charset = java.nio.charset.StandardCharsets.UTF_16; |
| } |
| |
| @Override |
| public void eval() { |
| //if input length <= target_type length, do nothing |
| //else truncate based on target_type length |
| byte[] buf = org.apache.drill.exec.expr.fn.impl.StringFunctionHelpers.toStringFromUTF8(in.start, in.end, in.buffer).getBytes(charset); |
| buffer.setBytes(0, buf); |
| |
| out.start = 0; |
| out.end = buf.length; |
| out.buffer = buffer; |
| } |
| } |
| |