| /* |
| * 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.functions; |
| |
| import java.nio.ByteBuffer; |
| import java.util.ArrayList; |
| import java.util.Collection; |
| import java.util.List; |
| |
| import org.apache.cassandra.cql3.CQL3Type; |
| import org.apache.cassandra.db.marshal.AbstractType; |
| import org.apache.cassandra.db.marshal.BytesType; |
| import org.apache.cassandra.db.marshal.UTF8Type; |
| import org.apache.cassandra.utils.ByteBufferUtil; |
| import org.apache.cassandra.exceptions.InvalidRequestException; |
| import org.apache.cassandra.serializers.MarshalException; |
| |
| public abstract class BytesConversionFcts |
| { |
| public static Collection<Function> all() |
| { |
| Collection<Function> functions = new ArrayList<>(); |
| |
| // because text and varchar ends up being synonymous, our automatic makeToBlobFunction doesn't work |
| // for varchar, so we special case it below. We also skip blob for obvious reasons. |
| for (CQL3Type type : CQL3Type.Native.values()) |
| { |
| if (type != CQL3Type.Native.VARCHAR && type != CQL3Type.Native.BLOB) |
| { |
| functions.add(makeToBlobFunction(type.getType())); |
| functions.add(makeFromBlobFunction(type.getType())); |
| } |
| } |
| |
| functions.add(VarcharAsBlobFct); |
| functions.add(BlobAsVarcharFct); |
| |
| return functions; |
| } |
| |
| // Most of the XAsBlob and blobAsX functions are basically no-op since everything is |
| // bytes internally. They only "trick" the type system. |
| public static Function makeToBlobFunction(AbstractType<?> fromType) |
| { |
| String name = fromType.asCQL3Type() + "asblob"; |
| return new NativeScalarFunction(name, BytesType.instance, fromType) |
| { |
| public ByteBuffer execute(int protocolVersion, List<ByteBuffer> parameters) |
| { |
| return parameters.get(0); |
| } |
| }; |
| } |
| |
| public static Function makeFromBlobFunction(final AbstractType<?> toType) |
| { |
| final String name = "blobas" + toType.asCQL3Type(); |
| return new NativeScalarFunction(name, toType, BytesType.instance) |
| { |
| public ByteBuffer execute(int protocolVersion, List<ByteBuffer> parameters) throws InvalidRequestException |
| { |
| ByteBuffer val = parameters.get(0); |
| try |
| { |
| if (val != null) |
| toType.validate(val); |
| return val; |
| } |
| catch (MarshalException e) |
| { |
| throw new InvalidRequestException(String.format("In call to function %s, value 0x%s is not a valid binary representation for type %s", |
| name, ByteBufferUtil.bytesToHex(val), toType.asCQL3Type())); |
| } |
| } |
| }; |
| } |
| |
| public static final Function VarcharAsBlobFct = new NativeScalarFunction("varcharasblob", BytesType.instance, UTF8Type.instance) |
| { |
| public ByteBuffer execute(int protocolVersion, List<ByteBuffer> parameters) |
| { |
| return parameters.get(0); |
| } |
| }; |
| |
| public static final Function BlobAsVarcharFct = new NativeScalarFunction("blobasvarchar", UTF8Type.instance, BytesType.instance) |
| { |
| public ByteBuffer execute(int protocolVersion, List<ByteBuffer> parameters) |
| { |
| return parameters.get(0); |
| } |
| }; |
| } |