| /* |
| * 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.phoenix.expression.function; |
| |
| import java.sql.SQLException; |
| import java.util.List; |
| |
| import org.apache.hadoop.hbase.io.ImmutableBytesWritable; |
| import org.apache.phoenix.exception.SQLExceptionCode; |
| import org.apache.phoenix.exception.SQLExceptionInfo; |
| import org.apache.phoenix.expression.Expression; |
| import org.apache.phoenix.parse.FunctionParseNode; |
| import org.apache.phoenix.schema.IllegalDataException; |
| import org.apache.phoenix.schema.types.PDataType; |
| import org.apache.phoenix.schema.types.PVarbinary; |
| import org.apache.phoenix.schema.types.PVarchar; |
| import org.apache.phoenix.schema.tuple.Tuple; |
| |
| /** |
| * Convert string to bytes |
| */ |
| @FunctionParseNode.BuiltInFunction(name = DecodeFunction.NAME, args = { |
| @FunctionParseNode.Argument(allowedTypes = { PVarchar.class }), |
| @FunctionParseNode.Argument(enumeration = "EncodeFormat")}) |
| public class DecodeFunction extends ScalarFunction { |
| |
| public static final String NAME = "DECODE"; |
| |
| public DecodeFunction() { |
| } |
| |
| public DecodeFunction(List<Expression> children) throws SQLException { |
| super(children); |
| } |
| |
| @Override |
| public boolean evaluate(Tuple tuple, ImmutableBytesWritable ptr) { |
| Expression expression = getExpression(); |
| if (!expression.evaluate(tuple, ptr)) { |
| return false; |
| } |
| if (ptr.getLength() == 0) { |
| return true; // expression was evaluated, but evaluated to null |
| } |
| |
| PDataType type = expression.getDataType(); |
| String stringToDecode = (String) type.toObject(ptr); |
| |
| Expression encodingExpression = getEncodingExpression(); |
| if (!encodingExpression.evaluate(tuple, ptr)) { |
| return false; |
| } |
| |
| if (ptr.getLength() == 0) { |
| throw new IllegalDataException(new SQLExceptionInfo.Builder(SQLExceptionCode.ILLEGAL_DATA) |
| .setMessage("Missing bytes encoding").build().buildException()); |
| } |
| |
| type = encodingExpression.getDataType(); |
| String encoding = ((String) type.toObject(ptr)).toUpperCase(); |
| |
| byte out[]; |
| |
| EncodeFormat format = EncodeFormat.valueOf(encoding); |
| switch (format) { |
| case HEX: |
| out = decodeHex(stringToDecode); |
| break; |
| default: |
| throw new IllegalDataException("Unsupported encoding \"" + encoding + "\""); |
| } |
| ptr.set(out); |
| |
| return true; |
| } |
| |
| private byte[] decodeHex(String hexStr) { |
| byte[] out = new byte[hexStr.length() / 2]; |
| for (int i = 0; i < hexStr.length(); i = i + 2) { |
| try { |
| out[i / 2] = (byte) Integer.parseInt(hexStr.substring(i, i + 2), 16); |
| } catch (NumberFormatException ex) { |
| throw new IllegalDataException(new SQLExceptionInfo.Builder(SQLExceptionCode.ILLEGAL_DATA) |
| .setMessage("Value " + hexStr.substring(i, i + 2) + " cannot be cast to hex number").build().buildException()); |
| } catch (StringIndexOutOfBoundsException ex) { |
| throw new IllegalDataException(new SQLExceptionInfo.Builder(SQLExceptionCode.ILLEGAL_DATA) |
| .setMessage("Invalid value length, cannot cast to hex number (" + hexStr + ")").build().buildException()); |
| } |
| } |
| return out; |
| } |
| |
| @Override |
| public PDataType getDataType() { |
| return PVarbinary.INSTANCE; |
| } |
| |
| @Override |
| public boolean isNullable() { |
| return getExpression().isNullable(); |
| } |
| |
| private Expression getExpression() { |
| return children.get(0); |
| } |
| |
| private Expression getEncodingExpression() { |
| return children.get(1); |
| } |
| |
| @Override |
| public String getName() { |
| return NAME; |
| } |
| |
| @Override |
| public Integer getMaxLength() { |
| return getExpression().getMaxLength(); |
| } |
| } |