/************************************************************************************** * Copyright (C) 2008 EsperTech, Inc. All rights reserved. * * http://esper.codehaus.org * * http://www.espertech.com * * ---------------------------------------------------------------------------------- * * The software in this package is published under the terms of the GPL license * * a copy of which has been included with this distribution in the license.txt file. * **************************************************************************************/ package com.espertech.esper.epl.expression; import com.espertech.esper.client.PropertyAccessException; import com.espertech.esper.collection.Pair; import com.espertech.esper.epl.core.PropertyResolutionDescriptor; import com.espertech.esper.epl.core.StreamTypeService; import com.espertech.esper.epl.core.StreamTypesException; import com.espertech.esper.util.LevenshteinDistance; public class ExprIdentNodeUtil { public static Pair<PropertyResolutionDescriptor, String> getTypeFromStream(StreamTypeService streamTypeService, String propertyNameNestable, boolean explicitPropertiesOnly, boolean obtainFragment) throws ExprValidationPropertyException { String streamOrProp = null; String prop = propertyNameNestable; if (propertyNameNestable.indexOf('.') != -1) { prop = propertyNameNestable.substring(propertyNameNestable.indexOf('.') + 1); streamOrProp = propertyNameNestable.substring(0, propertyNameNestable.indexOf('.')); } if (explicitPropertiesOnly) { return getTypeFromStreamExplicitProperties(streamTypeService, prop, streamOrProp, obtainFragment); } return getTypeFromStream(streamTypeService, prop, streamOrProp, obtainFragment); } /** * Determine stream id and property type given an unresolved property name and * a stream name that may also be part of the property name. * <p> * For example: select s0.p1 from... p1 is the property name, s0 the stream name, however this could also be a nested property * @param streamTypeService - service for type infos * @param unresolvedPropertyName - property name * @param streamOrPropertyName - stream name, this can also be the first part of the property name * @return pair of stream number and property type * @throws ExprValidationPropertyException if no such property exists */ protected static Pair<PropertyResolutionDescriptor, String> getTypeFromStream(StreamTypeService streamTypeService, String unresolvedPropertyName, String streamOrPropertyName, boolean obtainFragment) throws ExprValidationPropertyException { PropertyResolutionDescriptor propertyInfo; // no stream/property name supplied if (streamOrPropertyName == null) { try { propertyInfo = streamTypeService.resolveByPropertyName(unresolvedPropertyName, obtainFragment); } catch (StreamTypesException ex) { throw getSuggestionException(ex); } catch (PropertyAccessException ex) { throw new ExprValidationPropertyException("Failed to find property '" + unresolvedPropertyName + "', the property name does not parse (are you sure?): " + ex.getMessage(), ex); } // resolves without a stream name, return descriptor and null stream name return new Pair<PropertyResolutionDescriptor, String>(propertyInfo, propertyInfo.getStreamName()); } // try to resolve the property name and stream name as it is (ie. stream name as a stream name) StreamTypesException typeExceptionOne; try { propertyInfo = streamTypeService.resolveByStreamAndPropName(streamOrPropertyName, unresolvedPropertyName, obtainFragment); // resolves with a stream name, return descriptor and stream name return new Pair<PropertyResolutionDescriptor, String>(propertyInfo, streamOrPropertyName); } catch (StreamTypesException ex) { typeExceptionOne = ex; } // try to resolve the property name to a nested property 's0.p0' StreamTypesException typeExceptionTwo; String propertyNameCandidate = streamOrPropertyName + '.' + unresolvedPropertyName; try { propertyInfo = streamTypeService.resolveByPropertyName(propertyNameCandidate, obtainFragment); // resolves without a stream name, return null for stream name return new Pair<PropertyResolutionDescriptor, String>(propertyInfo, null); } catch (StreamTypesException ex) { typeExceptionTwo = ex; } throw getSuggestionExceptionSecondStep(propertyNameCandidate, typeExceptionOne, typeExceptionTwo); } /** * This method only resolves against explicitly-listed properties (for use with XML or other types that allow any name as a property name). * @param streamTypeService stream types * @param unresolvedPropertyName property name * @param streamOrPropertyName optional stream name * @return property info * @throws ExprValidationPropertyException if the property could not be resolved */ protected static Pair<PropertyResolutionDescriptor, String> getTypeFromStreamExplicitProperties(StreamTypeService streamTypeService, String unresolvedPropertyName, String streamOrPropertyName, boolean obtainFragment) throws ExprValidationPropertyException { PropertyResolutionDescriptor propertyInfo; // no stream/property name supplied if (streamOrPropertyName == null) { try { propertyInfo = streamTypeService.resolveByPropertyNameExplicitProps(unresolvedPropertyName, obtainFragment); } catch (StreamTypesException ex) { throw getSuggestionException(ex); } catch (PropertyAccessException ex) { throw new ExprValidationPropertyException(ex.getMessage()); } // resolves without a stream name, return descriptor and null stream name return new Pair<PropertyResolutionDescriptor, String>(propertyInfo, propertyInfo.getStreamName()); } // try to resolve the property name and stream name as it is (ie. stream name as a stream name) StreamTypesException typeExceptionOne; try { propertyInfo = streamTypeService.resolveByStreamAndPropNameExplicitProps(streamOrPropertyName, unresolvedPropertyName, obtainFragment); // resolves with a stream name, return descriptor and stream name return new Pair<PropertyResolutionDescriptor, String>(propertyInfo, streamOrPropertyName); } catch (StreamTypesException ex) { typeExceptionOne = ex; } // try to resolve the property name to a nested property 's0.p0' StreamTypesException typeExceptionTwo; String propertyNameCandidate = streamOrPropertyName + '.' + unresolvedPropertyName; try { propertyInfo = streamTypeService.resolveByPropertyNameExplicitProps(propertyNameCandidate, obtainFragment); // resolves without a stream name, return null for stream name return new Pair<PropertyResolutionDescriptor, String>(propertyInfo, null); } catch (StreamTypesException ex) { typeExceptionTwo = ex; } throw getSuggestionExceptionSecondStep(propertyNameCandidate, typeExceptionOne, typeExceptionTwo); } private static ExprValidationPropertyException getSuggestionExceptionSecondStep(String propertyNameCandidate, StreamTypesException typeExceptionOne, StreamTypesException typeExceptionTwo) { String suggestionOne = getSuggestion(typeExceptionOne); String suggestionTwo = getSuggestion(typeExceptionTwo); if (suggestionOne != null) { return new ExprValidationPropertyException(typeExceptionOne.getMessage() + suggestionOne); } if (suggestionTwo != null) { return new ExprValidationPropertyException(typeExceptionTwo.getMessage() + suggestionTwo); } // fail to resolve return new ExprValidationPropertyException("Failed to resolve property '" + propertyNameCandidate + "' to a stream or nested property in a stream"); } private static ExprValidationPropertyException getSuggestionException(StreamTypesException ex) { String suggestion = getSuggestion(ex); if (suggestion != null) { return new ExprValidationPropertyException(ex.getMessage() + suggestion); } else { return new ExprValidationPropertyException(ex.getMessage()); } } private static String getSuggestion(StreamTypesException ex) { if (ex == null) { return null; } if (ex.getOptionalSuggestion() == null) { return null; } if (ex.getOptionalSuggestion().getFirst() > LevenshteinDistance.ACCEPTABLE_DISTANCE) { return null; } return " (did you mean '" + ex.getOptionalSuggestion().getSecond() + "'?)"; } }