Class: Norikra::Query

Inherits:
Object
  • Object
show all
Defined in:
lib/norikra/query.rb,
lib/norikra/query/ast.rb

Direct Known Subclasses

SubQuery

Defined Under Namespace

Classes: ASTEventPropNode, ASTExpression, ASTLibFunctionArgItemNode, ASTLibFunctionNode, ASTNode, ASTPatternNode, ASTSelectionElementNode, ASTStreamEventNode, ASTStreamNode, ASTStreamPatternNode, ASTSubSelectNode, ParseRuleSelectorImpl

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(param = {}) ⇒ Query

Returns a new instance of Query.

Raises:



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# File 'lib/norikra/query.rb', line 15

def initialize(param={})
  @name = param[:name]
  raise Norikra::ArgumentError, "Query name MUST NOT be blank" if @name.nil? || @name.empty?
  @group = param[:group] # default nil
  #TODO: ad-hoc query rewriting for https://jira.codehaus.org/browse/ESPER-788
  @expression = param[:expression].gsub(/([ ,])(MIN|MAX)\(/){ $1 + $2.downcase + '(' }
  raise Norikra::ArgumentError, "Query expression MUST NOT be blank" if @expression.nil? || @expression.empty?

  @statement_name = nil
  @fieldsets = {} # { target => fieldset }
  @ast = nil
  @targets = nil
  @aliases = nil
  @subqueries = nil
  @fields = nil
  @nullable_fields = nil
end

Instance Attribute Details

#expression ⇒ Object

Returns the value of attribute expression.



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# File 'lib/norikra/query.rb', line 13

def expression
  @expression
end

#fieldsets ⇒ Object

Returns the value of attribute fieldsets.



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# File 'lib/norikra/query.rb', line 13

def fieldsets
  @fieldsets
end

#group ⇒ Object

Returns the value of attribute group.



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# File 'lib/norikra/query.rb', line 13

def group
  @group
end

#name ⇒ Object

Returns the value of attribute name.



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# File 'lib/norikra/query.rb', line 13

def name
  @name
end

#statement_name ⇒ Object

Returns the value of attribute statement_name.



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# File 'lib/norikra/query.rb', line 13

def statement_name
  @statement_name
end

Class Method Details

.imported_java_class?(name) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/norikra/query/ast.rb', line 1575

def self.imported_java_class?(name)
  return false unless name =~ /^[A-Z]/
  # Esper auto-imports the following Java library packages:
  # java.lang.* -> Java::JavaLang::*
  # java.math.* -> Java::JavaMath::*
  # java.text.* -> Java::JavaText::*
  # java.util.* -> Java::JavaUtil::*
  java_class('Java::JavaLang::'+name) || java_class('Java::JavaMath::'+name) ||
    java_class('Java::JavaText::'+name) || java_class('Java::JavaUtil::'+name) || false
end

.java_class(const_name) ⇒ Object 



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# File 'lib/norikra/query/ast.rb', line 1586

def self.java_class(const_name)
  begin
    c = eval(const_name)
    c.class == Kernel ? nil : c
  rescue NameError
    return nil
  end
end

.rewrite_event_field_name(statement_model, mapping, fqfs_prefixes = nil) ⇒ Object 



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# File 'lib/norikra/query.rb', line 306

def self.rewrite_event_field_name(statement_model, mapping, fqfs_prefixes=nil)
  # mapping: {target_name => query_event_type_name}
  #  mapping is for target name rewriting of fully qualified field name access


  # model.getFromClause.getStreams[0].getViews[0].getParameters[0].getPropertyName

  # model.getSelectClause.getSelectList[0].getExpression.getPropertyName
  # model.getSelectClause.getSelectList[0].getExpression.getChildren[0].getPropertyName #=> 'field.key1.$0'

  # model.getWhereClause.getChildren[1].getChildren[0].getPropertyName #=> 'field.key1.$1'
  # model.getWhereClause.getChildren[2].getChildren[0].getChain[0].getName #=> 'opts.num.$0' from opts.num.$0.length()

  query = Norikra::Query.new(name: 'dummy name by .rewrite_event_field_name', expression: statement_model.toEPL)
  targets = query.targets
  fqfs_prefixes ||= (targets + query.aliases)

  default_target = (targets.size == 1 ? targets.first : nil)

  rewrite_name = lambda {|node,getter,setter|
    name = node.send(getter)
    if name && name.index('.')
      prefix = nil
      body = nil
      first_part = name.split('.').first
      if fqfs_prefixes.include?(first_part) or mapping.has_key?(first_part) # fully qualified field specification
        prefix = first_part
        if mapping[prefix]
          prefix = mapping[prefix]
        end
        body = name.split('.')[1..-1].join('.')
      elsif default_target # default target field (outside of join context)
        body = name
      else
        raise Norikra::QueryError, "target cannot be determined for field '#{name}'"
      end
      #### 'field.javaMethod("args")' MUST NOT be escaped....
      # 'getPropertyName' returns a String "path.index(\".\")" for java method calling,
      #  and other optional informations are not provided.
      # We seems that '.camelCase(ANYTHING)' should be a method calling, not nested field accesses.
      # This is ugly, but works.
      #
      # 'path.substring(0, path.indexOf(path.substring(1,1)))' is parsed as 3-times-nested LIB_FUNCTION_CHAIN,
      #  so does not make errors.
      #
      method_chains = []
      body_chains = body.split('.')
      while body_chains.size > 0
        break unless body_chains.last =~ /^[a-z][a-zA-Z]*\(.*\)$/
        method_chains.unshift body_chains.pop
      end

      escaped_body = Norikra::Field.escape_name(body_chains.join('.'))
      encoded = (prefix ? "#{prefix}." : "") + escaped_body + (method_chains.size > 0 ? '.' + method_chains.join('.') : '' )
      node.send(setter, encoded)
    end
  }

  rewriter = lambda {|node|
    if node.respond_to?(:getPropertyName)
      rewrite_name.call(node, :getPropertyName, :setPropertyName)
    elsif node.respond_to?(:getChain)
      node.getChain.each do |chain|
        rewrite_name.call(chain, :getName, :setName)
      end
    end
  }
  recaller = lambda {|node|
    Norikra::Query.rewrite_event_field_name(node.getModel, mapping, fqfs_prefixes)
  }

  traverse_fields(rewriter, recaller, statement_model)
end

.rewrite_event_type_name(statement_model, mapping) ⇒ Object 



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# File 'lib/norikra/query.rb', line 380

def self.rewrite_event_type_name(statement_model, mapping)
  # mapping: {target_name => query_event_type_name}

  ### esper-4.9.0/esper/doc/reference/html/epl_clauses.html#epl-subqueries
  # Subqueries can only consist of a select clause, a from clause and a where clause.
  # The group by and having clauses, as well as joins, outer-joins and output rate limiting are not permitted within subqueries.

  # model.getFromClause.getStreams[0].getFilter.setEventTypeName("hoge") # normal Stream
  # model.getFromClause.getStreams[1].getExpression.getChildren[0].getChildren[0].getFilter.getEventTypeName # pattern

  # model.getSelectClause.getSelectList[1].getExpression => #<Java::ComEspertechEsperClientSoda::SubqueryExpression:0x3344c133>
  # model.getSelectClause.getSelectList[1].getExpression.getModel.getFromClause.getStreams[0].getFilter.getEventTypeName
  # model.getWhereClause.getChildren[1]                 .getModel.getFromClause.getStreams[0].getFilter.getEventTypeName

  rewriter = lambda {|node|
    if node.respond_to?(:getEventTypeName)
      target_name = node.getEventTypeName
      rewrite_name = mapping[ target_name ]
      unless rewrite_name
        raise RuntimeError, "target missing in mapping, maybe BUG: #{target_name}"
      end
      node.setEventTypeName(rewrite_name)
    end
  }
  recaller = lambda {|node|
    Norikra::Query.rewrite_event_type_name(node.getModel, mapping)
  }
  traverse_fields(rewriter, recaller, statement_model)
end

.rewrite_nullable_fields(statement_model) ⇒ Object 



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# File 'lib/norikra/query.rb', line 262

def self.rewrite_nullable_fields(statement_model)
  # NULLABLE(field) -> field
  ## NOTICE: NULLABLE(...) cannot be used in view parameters. ex: target.std:unique(NULLABLE(a)) -> x
  check_nullable = lambda {|exp|
    # top-level lib function
    # exp.getChain[0] #=> Java::ComEspertechEsperClientSoda::DotExpressionItem
    exp &&
    exp.is_a?(Java::ComEspertechEsperClientSoda::DotExpression) &&
    exp.getChain.size == 1 &&
    exp.getChain[0].name.upcase == 'NULLABLE'
  }
  fetch_field = lambda {|exp| exp.getChain[0].getParameters[0] }

  rewriter = lambda {|node|
    # without loop of parameters because this code shows which parameter cause errors in user's environment
    if node.respond_to?(:getExpression) && check_nullable.(node.getExpression)
      node.setExpression(fetch_field.(node.getExpression))
    end

    if node.respond_to?(:getFilter) && check_nullable.(node.getFilter)
      node.setFilter(fetch_field.(node.getFilter))
    end

    if node.respond_to?(:getChildren) && node.getChildren.any?{|exp| check_nullable.(exp) }
      node.setChildren(node.getChildren.map{|e| check_nullable.(e) ? fetch_field.(e) : e })
    end

    if node.respond_to?(:getParameters) && node.getParameters.any?{|exp| check_nullable.(exp) }
      node.setParameters(node.getParameters.map{|e| check_nullable.(e) ? fetch_field.(e) : e })
    end
    if node.respond_to?(:getChain) && node.getChain.any?{|exp| check_nullable.(exp) }
      node.setChain(node.getChain.map{|e| check_nullable.(e) ? fetch_field.(e) : e })
    end

    if node.respond_to?(:getExpressions) && node.getExpressions.any?{|exp| check_nullable.(exp) }
      node.setExpressions(node.getExpressions.map{|e| check_nullable.(e) ? fetch_field.(e) : e })
    end
  }
  recaller = lambda {|node|
    Norikra::Query.rewrite_nullable_fields(node.getModel)
  }
  traverse_fields(rewriter, recaller, statement_model)
end

.rewrite_query(statement_model, mapping) ⇒ Object 



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# File 'lib/norikra/query.rb', line 256

def self.rewrite_query(statement_model, mapping)
  rewrite_nullable_fields(statement_model)
  rewrite_event_type_name(statement_model, mapping)
  rewrite_event_field_name(statement_model, mapping)
end

.traverse_fields(rewriter, recaller, statement_model) ⇒ Object

:getAnnotations, :getClass, :getContextName, :getCreateContext, :getCreateDataFlow, :getCreateExpression, :getCreateIndex, :getCreateSchema, :getCreateVariable, :getCreateWindow, :getExpressionDeclarations, :getFireAndForgetClause, :getForClause, (*) :getFromClause, (*) :getGroupByClause, (*) :getHavingClause, :getInsertInto, :getMatchRecognizeClause, :getOnExpr, (*) :getOrderByClause, :getOutputLimitClause, :getRowLimitClause, :getScriptExpressions, (*) :getSelectClause, :getTreeObjectName, :getUpdateClause, (*) :getWhereClause,



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# File 'lib/norikra/query.rb', line 441

def self.traverse_fields(rewriter, recaller, statement_model)
  #NOTICE: SQLStream is not supported yet.
  dig = lambda {|node|
    return unless node
    rewriter.call(node)

    if node.is_a?(Java::ComEspertechEsperClientSoda::SubqueryExpression)
      recaller.call(node)
    end
    if node.respond_to?(:getFilter)
      dig.call(node.getFilter)
    end
    if node.respond_to?(:getChildren)
      node.getChildren.each do |c|
        dig.call(c)
      end
    end
    if node.respond_to?(:getParameters)
      node.getParameters.each do |p|
        dig.call(p)
      end
    end
    if node.respond_to?(:getChain)
      node.getChain.each do |c|
        dig.call(c)
      end
    end
    if node.respond_to?(:getExpression)
      dig.call(node.getExpression)
    end
    if node.respond_to?(:getExpressions)
      node.getExpressions.each do |e|
        dig.call(e)
      end
    end
  }

  statement_model.getFromClause.getStreams.each do |stream|
    if stream.respond_to?(:getExpression) # PatternStream < ProjectedStream
      dig.call(stream.getExpression)
    end
    if stream.respond_to?(:getFilter) # Filter < ProjectedStream
      dig.call(stream.getFilter)
    end
    if stream.respond_to?(:getParameterExpressions) # MethodInvocationStream
      dig.call(stream.getParameterExpressions)
    end
    if stream.respond_to?(:getViews) # ProjectedStream
      stream.getViews.each do |view|
        view.getParameters.each do |parameter|
          dig.call(parameter)
        end
      end
    end
  end

  if statement_model.getSelectClause
    statement_model.getSelectClause.getSelectList.each do |item|
      dig.call(item)
    end
  end

  if statement_model.getWhereClause
    statement_model.getWhereClause.getChildren.each do |child|
      dig.call(child)
    end
  end

  if statement_model.getGroupByClause
    statement_model.getGroupByClause.getGroupByExpressions.each do |item|
      dig.call(item)
    end
  end

  if statement_model.getOrderByClause
    statement_model.getOrderByClause.getOrderByExpressions.each do |item|
      dig.call(item)
    end
  end

  if statement_model.getHavingClause
    dig.call(statement_model.getHavingClause)
  end

  statement_model
end

Instance Method Details

#<=>(other) ⇒ Object 



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# File 'lib/norikra/query.rb', line 38

def <=>(other)
  if @group.nil? || other.group.nil?
    if @group.nil? && other.group.nil?
      @name <=> other.name
    else
      @group.to_s <=> other.group.to_s
    end
  else
    if @group == other.group
      self.name <=> other.name
    else
      self.group <=> other.group
    end
  end
end

#aliases ⇒ Object 



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# File 'lib/norikra/query.rb', line 99

def aliases
  return @aliases if @aliases
  @aliases = (self.ast.listup(:stream).map{|s| s.aliases.map(&:first) }.flatten + self.subqueries.map(&:aliases).flatten).sort.uniq
  @aliases
end

#ast ⇒ Object 



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# File 'lib/norikra/query.rb', line 217

def ast
  return @ast if @ast
  rule = ParseRuleSelectorImpl.new
  target = @expression.dup
  forerrmsg = @expression.dup
  result = Java::ComEspertechEsperEplParse::ParseHelper.parse(target, forerrmsg, true, rule, false)

  # walk through AST and check syntax errors/semantic errors
  ast = result.tree

  services = Java::ComEspertechEsperClient::EPServiceProviderManager.getDefaultProvider.getServicesContext

  walker = Java::ComEspertechEsperEplParse::EPLTreeWalkerListener.new(
    result.getTokenStream,
    services.getEngineImportService,
    services.getVariableService,
    services.getSchedulingService,
    Java::ComEspertechEsperEplSpec::SelectClauseStreamSelectorEnum.mapFromSODA(
      services.getConfigSnapshot.getEngineDefaults.getStreamSelection.getDefaultStreamSelector
    ),
    services.getEngineURI,
    services.getConfigSnapshot,
    services.getPatternNodeFactory,
    services.getContextManagementService,
    result.getScripts,
    services.getExprDeclaredService,
    services.getTableService
  )

  Java::ComEspertechEsperEplParse::ParseHelper.walk(ast, walker, target, forerrmsg)

  @ast = astnode(ast)
  @ast
rescue Java::ComEspertechEsperEplParse::ASTWalkException => e
  raise Norikra::QueryError, e.message
rescue Java::ComEspertechEsperClient::EPStatementSyntaxException => e
  raise Norikra::QueryError, e.message
end

#astnode(tree) ⇒ Object

[“startEPLExpressionRule”,

["eplExpression",
  ["selectExpr",
    "SELECT",
    ["selectClause",
      ["selectionList",
        ["selectionListElement",
          ["selectionListElementExpr",
            ["expression",
              ["caseExpression",["evalOrExpression",["evalAndExpression",["bitWiseExpression",["negatedExpression",
                ["evalEqualsExpression",["evalRelationalExpression",["concatenationExpr",["additiveExpression",
                  ["multiplyExpression",["unaryExpression",
                    ["eventPropertyOrLibFunction",
                      ["eventProperty",
                        ["eventPropertyAtomic", ["eventPropertyIdent", ["keywordAllowedIdent", "a"]]]]]]]]]]]]]]]]]]],
        ",",
        ["selectionListElement",
          ["selectionListElementExpr",
            ["expression",
              ["caseExpression",["evalOrExpression",["evalAndExpression",["bitWiseExpression",["negatedExpression",
                ["evalEqualsExpression",["evalRelationalExpression",["concatenationExpr",["additiveExpression",
                  ["multiplyExpression",["unaryExpression",
                    ["eventPropertyOrLibFunction",
                      ["libFunction",
                        ["libFunctionWithClass",
                          ["funcIdentTop", ["escapableIdent", "NULLABLE"]],
                            "(",
                            ["libFunctionArgs",
                              ["libFunctionArgItem",
                                ["expressionWithTime",
                                  ["expressionQualifyable",
                                    ["expression",
                                      ["caseExpression",["evalOrExpression",["evalAndExpression",["bitWiseExpression",
                                        ["negatedExpression",["evalEqualsExpression",["evalRelationalExpression",
                                          ["concatenationExpr",["additiveExpression",["multiplyExpression",["unaryExpression",
                                            ["eventPropertyOrLibFunction",
                                              ["eventProperty",
                                                ["eventPropertyAtomic",
                                                  ["eventPropertyIdent", ["keywordAllowedIdent", "b"]]]]]]]]]]]]]]]]]]]]],
                            ")"]]]]]]]]]]]]]]]]],
        ",",
        ["selectionListElement",
          ["selectionListElementExpr",
            ["expression",
              ["caseExpression",["evalOrExpression",["evalAndExpression",["bitWiseExpression",["negatedExpression",
                ["evalEqualsExpression",["evalRelationalExpression",["concatenationExpr",["additiveExpression",
                  ["multiplyExpression",["unaryExpression",
                    ["builtinFunc",
                      "COUNT",
                      "(",
                      "DISTINCT",
                      ["expression",
                        ["caseExpression",["evalOrExpression",["evalAndExpression",["bitWiseExpression",
                          ["negatedExpression",["evalEqualsExpression",["evalRelationalExpression",
                            ["concatenationExpr",["additiveExpression",["multiplyExpression",["unaryExpression",
                              ["eventPropertyOrLibFunction",
                                ["libFunction",
                                  ["libFunctionWithClass",
                                    ["funcIdentTop", ["escapableIdent", "NULLABLE"]],
                                      "(",
                                      ["libFunctionArgs",
                                        ["libFunctionArgItem",
                                          ["expressionWithTime",
                                            ["expressionQualifyable",
                                              ["expression",
                                                ["caseExpression",["evalOrExpression",["evalAndExpression",["bitWiseExpression",
                                                  ["negatedExpression",["evalEqualsExpression",["evalRelationalExpression",
                                                    ["concatenationExpr",["additiveExpression",["multiplyExpression",
                                                      ["unaryExpression",
                                                        ["eventPropertyOrLibFunction",
                                                          ["eventProperty",
                                                            ["eventPropertyAtomic",
                                                              ["eventPropertyIdent",
                                                                ["keywordAllowedIdent", "c"]]]]]]]]]]]]]]]]]]]]],
                                                                    ")"]]]]]]]]]]]]]]],
                                      ")"]]]]]]]]]]]]]]]]],
    "FROM",
    ["fromClause",
      ["streamExpression", ["eventFilterExpression", ["classIdentifier", ["escapableStr", "t"]]]],
      "regularJoin"],
    "GROUP",
    "BY",
    ["groupByListExpr",
      ["groupByListChoice",
        ["expression",
          ["caseExpression",["evalOrExpression",["evalAndExpression",["bitWiseExpression",["negatedExpression",
            ["evalEqualsExpression",["evalRelationalExpression",["concatenationExpr",["additiveExpression",
              ["multiplyExpression",["unaryExpression",
                ["eventPropertyOrLibFunction",
                  ["eventProperty",
                    ["eventPropertyAtomic", ["eventPropertyIdent", ["keywordAllowedIdent", "a"]]]]]]]]]]]]]]]]]],
      ",",
      ["groupByListChoice",
        ["expression",
          ["caseExpression",["evalOrExpression",["evalAndExpression",["bitWiseExpression",["negatedExpression",
            ["evalEqualsExpression",["evalRelationalExpression",["concatenationExpr",["additiveExpression",
              ["multiplyExpression",["unaryExpression",
                ["eventPropertyOrLibFunction",
                  ["libFunction",
                    ["libFunctionWithClass",
                      ["funcIdentTop", ["escapableIdent", "NULLABLE"]],
                      "(",
                      ["libFunctionArgs",
                        ["libFunctionArgItem",
                          ["expressionWithTime",
                            ["expressionQualifyable",
                              ["expression",
                                ["caseExpression",["evalOrExpression",["evalAndExpression",["bitWiseExpression",
                                  ["negatedExpression",["evalEqualsExpression",["evalRelationalExpression",
                                    ["concatenationExpr",["additiveExpression",["multiplyExpression",["unaryExpression",
                                      ["eventPropertyOrLibFunction",
                                        ["eventProperty",
                                          ["eventPropertyAtomic",
                                            ["eventPropertyIdent", ["keywordAllowedIdent", "b"]]]]]]]]]]]]]]]]]]]]],
                                      ")"]]]]]]]]]]]]]]]]]]],
"<EOF>"]



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# File 'lib/norikra/query/ast.rb', line 839

def astnode(tree)
  # com.espertech.esper.epl.generated.EsperEPL2GrammarParser.ruleNames[ast.ruleIndex] #=> "startEPLExpressionRule"
  # com.espertech.esper.epl.generated.EsperEPL2GrammarParser.ruleNames[ast.getChild(0).ruleIndex] #=> "eplExpression"

  # ast.getChild(0).getChild(0).ruleIndex #=> 15
  # com.espertech.esper.epl.generated.EsperEPL2GrammarParser.ruleNames[ast.getChild(0).getChild(0).ruleIndex] #=> "selectExpr"
  # ast.getChild(0).getChild(0).getChild(0).symbol.text #=> 'select'
  # ast.getChild(0).getChild(0).getChild(0).symbol.type #=> 24

  # [23] pry(main)> ast.getChild(0).getChild(1)
  # => nil
  # [24] pry(main)> ast.getChild(0).getChild(0).getChild(1)
  # => #<Java::ComEspertechEsperEplGenerated::EsperEPL2GrammarParser::SelectClauseContext:0x6437693>
  # [25] pry(main)> ast.getChild(0).getChild(0).getChild(1).getChild(0)
  # => #<Java::ComEspertechEsperEplGenerated::EsperEPL2GrammarParser::SelectionListContext:0x5de28c04>

  name = if tree.respond_to?(:getRuleIndex)
           Java::ComEspertechEsperEplGenerated::EsperEPL2GrammarParser.ruleNames[tree.getRuleIndex]
         else
           tree.symbol.text
         end
  children = []
  tree.childCount.times do |i|
    child = tree.getChild(i)
    children << astnode(child) if child
  end

  cls = case name
        when 'expression' then ASTExpression
        when 'eventProperty' then ASTEventPropNode
        when 'selectionListElementExpr' then ASTSelectionElementNode
        when 'libFunction' then ASTLibFunctionNode
        when 'libFunctionArgItem' then ASTLibFunctionArgItemNode
        when 'streamExpression', 'subSelectFilterExpr' then ASTStreamNode
        when 'patternFilterExpression' then ASTPatternNode
        when 'subQueryExpr' then ASTSubSelectNode
        else ASTNode
        end
  if cls.respond_to?(:generate)
    cls.generate(name, children, tree)
  else
    cls.new(name, children, tree)
  end
end

#dump ⇒ Object 



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# File 'lib/norikra/query.rb', line 62

def dump
  {name: @name, group: @group, expression: @expression}
end

#dup ⇒ Object 



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# File 'lib/norikra/query.rb', line 54

def dup
  self.class.new(name: @name, group: @group, expression: @expression.dup)
end

#explore(outer_targets = [], alias_overridden = {}) ⇒ Object 



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# File 'lib/norikra/query.rb', line 111

def explore(outer_targets=[], alias_overridden={})
  fields = {
    defs: { all: [], unknown: [], target: {} },
    nullables: { all: [], unknown: [], target: {} },
  }

  alias_map = alias_overridden.dup

  self.ast.listup(:stream).each do |node|
    node.aliases.each do |alias_name, target|
      alias_map[alias_name] = target
    end
    node.targets.each do |target|
      fields[:defs][:target][target] = []
      fields[:nullables][:target][target] = []
    end
  end

  # default target should be out of effect of outer_targets
  default_target = fields[:defs][:target].keys.size == 1 ? fields[:defs][:target].keys.first : nil

  outer_targets.each do |t|
    fields[:defs][:target][t] ||= []
    fields[:nullables][:target][t] ||= []
  end

  dup_aliases = (alias_map.keys & fields[:defs][:target].keys)
  unless dup_aliases.empty?
    raise Norikra::ClientError, "Invalid alias '#{dup_aliases.join(',')}', same with target name"
  end

  # names of 'AS'
  field_aliases = self.ast.listup(:selection).map(&:alias).compact

  known_targets_aliases = fields[:defs][:target].keys + alias_map.keys
  self.ast.fields(default_target, known_targets_aliases).each do |field_def|
    f = field_def[:f]
    next if field_aliases.include?(f)

    fields[:defs][:all].push(f)
    fields[:nullables][:all].push(f) if field_def[:n]

    if field_def[:t]
      t = alias_map[field_def[:t]] || field_def[:t]
      unless fields[:defs][:target][t]
        raise Norikra::ClientError, "unknown target alias name for: #{field_def[:t]}.#{field_def[:f]}"
      end
      fields[:defs][:target][t].push(f)
      fields[:nullables][:target][t].push(f) if field_def[:n]
    else
      fields[:defs][:unknown].push(f)
      fields[:nullables][:unknown].push(f) if field_def[:n]
    end
  end

  self.subqueries.each do |subquery|
    sub = {}
    sub[:defs], sub[:nullables] = subquery.explore(fields[:defs][:target].keys, alias_map)

    [:defs, :nullables].each do |group|
      fields[group][:all] += sub[group].delete('')
      fields[group][:unknown] += sub[group].delete(nil)
      sub[group].keys.each do |t|
        fields[group][:target][t] ||= []
        fields[group][:target][t] += sub[group][t]
      end
    end
  end

  compact = ->(data){
    r = {}
    data[:target].keys.each do |t|
      r[t] = data[:target][t].sort.uniq
    end
    r[''] = data[:all].sort.uniq
    r[nil] = data[:unknown].sort.uniq
    r
  }

  [ compact.(fields[:defs]), compact.(fields[:nullables]) ]
end

#fields(target = '') ⇒ Object 



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# File 'lib/norikra/query.rb', line 193

def fields(target='')
  # target '': fields for all targets (without target name)
  # target nil: fields for unknown targets
  return @fields[target] if @fields

  @fields, @nullable_fields = explore()
  @fields[target]
end

#inspect ⇒ Object 



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# File 'lib/norikra/query.rb', line 33

def inspect
  internal = ['name', 'group', 'expression', 'statement_name', 'targets', 'aliases', 'fields', 'nullable_fields', 'subqueries', 'fieldsets'].map{|x| "@#{x}=" + self.send(x.to_sym).inspect }.join(", ")
  "<#Norikra::Query:#{self.object_id} #{internal}>"
end

#invalid? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/norikra/query.rb', line 70

def invalid?
  # check query is invalid as Norikra query or not, and return invalid reason (or nil for valid queries)

  # "SELECT *" is prohibited because each Norikra targets does not have all fields users expect
  if self.ast.listup('selectionListElement').any?{|node| node.children.map(&:name).any?{|name| name == '*' } }
    # '*' is a direct child of selectionListElement, not selectionListElementExpr
    return "'SELECT *' is prohibited in query"
  end

  # NULLABLE(...) can have "a" single field reference only
  nullables = self.ast.listup(:libfunc).select{|node| node.function_name.upcase == "NULLABLE" }
  if nullables.size > 0
    unless nullables.all?{|node| args = node.find("libFunctionArgs"); args && args.has_a?(:libarg) }
      return "NULLABLE(...) must have a field argument"
    end
    unless nullables.all?{|node| exp = node.find(:libarg).expression; exp && exp.propertyReference? }
      return "NULLABLE(...) can get a field, not expression"
    end
  end

  nil
end

#nullable_fields(target = '') ⇒ Object 



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# File 'lib/norikra/query.rb', line 202

def nullable_fields(target='')
  # argument target is same with #fields
  return @nullable_fields[target] if @nullable_fields

  @fields, @nullable_fields = explore()
  @nullable_fields[target]
end

#subqueries ⇒ Object 



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# File 'lib/norikra/query.rb', line 105

def subqueries
  return @subqueries if @subqueries
  @subqueries = self.ast.listup(:subquery).map{|n| Norikra::SubQuery.new(n)}
  @subqueries
end

#suspended? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/norikra/query.rb', line 66

def suspended?
  false
end

#targets ⇒ Object 



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# File 'lib/norikra/query.rb', line 93

def targets
  return @targets if @targets
  @targets = (self.ast.listup(:stream).map(&:targets).flatten + self.subqueries.map(&:targets).flatten).sort.uniq
  @targets
end

#to_hash ⇒ Object 



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# File 'lib/norikra/query.rb', line 58

def to_hash
  {'name' => @name, 'group' => @group, 'expression' => @expression, 'targets' => self.targets, 'suspended' => false}
end