| /* |
| * 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.vxquery.runtime.functions.strings; |
| |
| import org.apache.hyracks.algebricks.runtime.base.IScalarEvaluator; |
| import org.apache.hyracks.algebricks.runtime.base.IScalarEvaluatorFactory; |
| import org.apache.hyracks.api.context.IHyracksTaskContext; |
| import org.apache.hyracks.api.exceptions.HyracksDataException; |
| import org.apache.hyracks.data.std.api.IPointable; |
| import org.apache.hyracks.data.std.primitive.UTF8StringPointable; |
| import org.apache.vxquery.datamodel.accessors.SequencePointable; |
| import org.apache.vxquery.datamodel.accessors.TaggedValuePointable; |
| import org.apache.vxquery.datamodel.values.ValueTag; |
| import org.apache.vxquery.datamodel.values.XDMConstants; |
| import org.apache.vxquery.exceptions.ErrorCode; |
| import org.apache.vxquery.exceptions.SystemException; |
| import org.apache.vxquery.runtime.functions.base.AbstractTaggedValueArgumentScalarEvaluator; |
| import org.apache.vxquery.runtime.functions.base.AbstractTaggedValueArgumentScalarEvaluatorFactory; |
| import org.apache.vxquery.runtime.functions.util.FunctionHelper; |
| |
| public class FnContainsEvaluatorFactory extends AbstractTaggedValueArgumentScalarEvaluatorFactory { |
| private static final long serialVersionUID = 1L; |
| |
| public FnContainsEvaluatorFactory(IScalarEvaluatorFactory[] args) { |
| super(args); |
| } |
| |
| @Override |
| protected IScalarEvaluator createEvaluator(IHyracksTaskContext ctx, IScalarEvaluator[] args) |
| throws HyracksDataException { |
| final UTF8StringPointable stringp1 = (UTF8StringPointable) UTF8StringPointable.FACTORY.createPointable(); |
| final UTF8StringPointable stringp2 = (UTF8StringPointable) UTF8StringPointable.FACTORY.createPointable(); |
| final UTF8StringPointable stringp3 = (UTF8StringPointable) UTF8StringPointable.FACTORY.createPointable(); |
| final UTF8StringCharacterIterator charIterator1 = new UTF8StringCharacterIterator(stringp1); |
| final UTF8StringCharacterIterator charIterator2 = new UTF8StringCharacterIterator(stringp2); |
| final SequencePointable seqp = (SequencePointable) SequencePointable.FACTORY.createPointable(); |
| |
| return new AbstractTaggedValueArgumentScalarEvaluator(args) { |
| @Override |
| protected void evaluate(TaggedValuePointable[] args, IPointable result) throws SystemException { |
| // Default result is false. |
| byte[] booleanResult = new byte[2]; |
| booleanResult[0] = ValueTag.XS_BOOLEAN_TAG; |
| booleanResult[1] = 0; |
| |
| TaggedValuePointable tvp1 = args[0]; |
| TaggedValuePointable tvp2 = args[1]; |
| |
| // Only accept strings as input. |
| if (tvp1.getTag() == ValueTag.SEQUENCE_TAG) { |
| tvp1.getValue(seqp); |
| if (seqp.getEntryCount() == 0) { |
| XDMConstants.setEmptyString(stringp1); |
| } else { |
| throw new SystemException(ErrorCode.FORG0006); |
| } |
| } else { |
| if (!FunctionHelper.isDerivedFromString(tvp1.getTag())) { |
| throw new SystemException(ErrorCode.FORG0006); |
| } |
| tvp1.getValue(stringp1); |
| } |
| if (tvp2.getTag() == ValueTag.SEQUENCE_TAG) { |
| tvp2.getValue(seqp); |
| if (seqp.getEntryCount() == 0) { |
| XDMConstants.setEmptyString(stringp2); |
| } else { |
| throw new SystemException(ErrorCode.FORG0006); |
| } |
| } else { |
| if (!FunctionHelper.isDerivedFromString(tvp2.getTag())) { |
| throw new SystemException(ErrorCode.FORG0006); |
| } |
| tvp2.getValue(stringp2); |
| } |
| charIterator1.reset(); |
| charIterator2.reset(); |
| |
| // Third parameter is optional. |
| if (args.length > 2) { |
| TaggedValuePointable tvp3 = args[2]; |
| if (!FunctionHelper.isDerivedFromString(tvp3.getTag())) { |
| throw new SystemException(ErrorCode.FORG0006); |
| } |
| tvp3.getValue(stringp3); |
| } |
| // TODO use the third value as collation |
| |
| // Only need to run comparisons if they both have a non empty string. |
| if (stringp1.getUTF8Length() > 0 && stringp2.getUTF8Length() > 0) { |
| int c2 = charIterator2.next(); |
| while (true) { |
| int c1 = charIterator1.next(); |
| if (c1 == c2) { |
| int offset1 = charIterator1.getByteOffset(); |
| |
| // Check substring. |
| if (checkSubString(charIterator1, charIterator2)) { |
| booleanResult[1] = 1; |
| break; |
| } |
| |
| // Reset for strings for continuation. |
| charIterator2.reset(); |
| c2 = charIterator2.next(); |
| charIterator1.setByteOffset(offset1); |
| } |
| if (c1 == ICharacterIterator.EOS_CHAR) { |
| // End of string and no match found. |
| break; |
| } |
| } |
| } else if (stringp2.getUTF8Length() == 0) { |
| booleanResult[1] = 1; |
| } |
| |
| result.set(booleanResult, 0, 2); |
| } |
| |
| private boolean checkSubString(ICharacterIterator charIterator1, ICharacterIterator charIterator2) { |
| while (true) { |
| int c1 = charIterator1.next(); |
| int c2 = charIterator2.next(); |
| if (c2 == ICharacterIterator.EOS_CHAR) { |
| // End of string. |
| return true; |
| } |
| if (c1 != c2) { |
| // No match found. |
| break; |
| } |
| } |
| return false; |
| } |
| }; |
| } |
| } |