private String createCodeForListConstruction(ListConstruction listConstr) {
addImports("org.pcollections.PCollection");
addImports("de.uni_koblenz.jgralab.JGraLab");
CodeList list = new CodeList();
CodeSnippet listSnippet = new CodeSnippet();
listSnippet.add("PCollection list = JGraLab.vector();");
StringBuilder builder = new StringBuilder("list = list");
for (IsPartOf_isPartOf_omega inc : listConstr.getIsPartOf_isPartOf_omegaIncidences()) {
Expression expr = (Expression) inc.getThat();
builder.append(".plus(" + createCodeForExpression(expr) + ")");
}
builder.append(";");
listSnippet.add(builder.toString());
listSnippet.add("return list;");
list.add(listSnippet);
return createMethod(list);
}
@Override
protected CodeBlock createHeader() {
CodeSnippet s = new CodeSnippet();
s.add(
"public class "
+ classname
+ " extends AbstractExecutableQuery implements ExecutableQuery {");
return s;
}
private String createCodeForConditionalExpression(ConditionalExpression condExpr) {
CodeList list = new CodeList();
Expression condition = (Expression) condExpr.getFirst_isConditionOf_omega().getThat();
Expression trueExpr = (Expression) condExpr.getFirst_isTrueExprOf_omega().getThat();
Expression falseExpr = (Expression) condExpr.getFirst_isFalseExprOf_omega().getThat();
CodeSnippet snip = new CodeSnippet();
list.add(snip);
snip.add("if ((Boolean) " + createCodeForExpression(condition) + ") {");
snip.add("\treturn " + createCodeForExpression(trueExpr) + ";");
snip.add("} else {");
snip.add("\treturn " + createCodeForExpression(falseExpr) + ";");
snip.add("}");
String retVal = createMethod(list);
return retVal;
}
private String createCodeForListRangeConstruction(ListRangeConstruction listConstr) {
addImports("org.pcollections.PCollection");
addImports("de.uni_koblenz.jgralab.JGraLab");
CodeList list = new CodeList();
CodeSnippet listSnippet = new CodeSnippet();
listSnippet.add("PCollection list = JGraLab.vector();");
Expression startExpr = (Expression) listConstr.getFirst_isFirstValueOf_omega().getThat();
Expression endExpr = (Expression) listConstr.getFirst_isLastValueOf_omega().getThat();
listSnippet.add(
"for (int i= "
+ createCodeForExpression(startExpr)
+ "; i<"
+ createCodeForExpression(endExpr)
+ "; i++) {");
listSnippet.add("list = list.plus(i);");
listSnippet.add("}");
listSnippet.add("return list;");
list.add(listSnippet);
return createMethod(list);
}
private String createCodeForFunctionApplication(FunctionApplication funApp) {
addImports("de.uni_koblenz.jgralab.greql2.funlib.FunLib");
// create static field to access function
FunctionId funId = (FunctionId) funApp.getFirst_isFunctionIdOf_omega().getThat();
Function function = FunLib.getFunctionInfo(funId.get_name()).getFunction();
String functionName = function.getClass().getName();
String functionSimpleName = function.getClass().getSimpleName();
if (functionSimpleName.contains("."))
functionSimpleName = functionSimpleName.substring(functionSimpleName.lastIndexOf("."));
addStaticField(
functionName,
functionSimpleName + "_" + functionNumber,
"("
+ functionName
+ ") FunLib.getFunctionInfo(\""
+ funId.get_name()
+ "\").getFunction()");
// create code list to evaluate function
CodeList list = new CodeList();
list.add(new CodeSnippet("return " + functionSimpleName + "_" + functionNumber + ".evaluate("));
functionNumber++;
String delim = "";
Method[] methods = function.getClass().getMethods();
Method evaluateMethod = null;
for (Method m : methods) {
if (m.getName() == "evaluate") evaluateMethod = m;
}
Class<?>[] paramTypes = evaluateMethod.getParameterTypes();
int currentParam = 0;
for (IsArgumentOf_isArgumentOf_omega argInc :
funApp.getIsArgumentOf_isArgumentOf_omegaIncidences()) {
Expression expr = (Expression) argInc.getThat();
CodeSnippet argEvalSnippet = new CodeSnippet();
String cast = "(" + paramTypes[currentParam++].getCanonicalName() + ")";
argEvalSnippet.add("\t\t" + delim + cast + createCodeForExpression(expr));
delim = ",";
list.add(argEvalSnippet);
}
list.add(new CodeSnippet(");"));
return createMethod(list);
}
/**
* Creates a method encapsulating the codelist given and returns the call of that method as a
* String
*
* @param list
* @return
*/
private String createMethod(CodeList list) {
int methodNumber = createdMethods.size();
String methodName = "internalEvaluationMethod_" + methodNumber;
CodeList methodBlock = new CodeList();
CodeSnippet start = new CodeSnippet();
start.add("private Object " + methodName + "(#variables#) {");
StringBuilder formalParams = new StringBuilder();
StringBuilder actualParams = new StringBuilder();
String delim = "";
for (String s : scope.getDefinedVariables()) {
formalParams.append(delim + "Object " + s);
actualParams.append(delim + s);
delim = ",";
}
start.setVariable("variables", formalParams.toString());
methodBlock.add(start);
methodBlock.add(list);
CodeSnippet fin = new CodeSnippet("}");
methodBlock.add(fin);
createdMethods.add(methodBlock);
return methodName + "(" + actualParams.toString() + ")";
}
protected CodeBlock createPackageDeclaration() {
CodeSnippet code = new CodeSnippet(true);
code.add("package de.uni_koblenz.jgralab.greql2.executable.queries;");
return code;
}
private void addStaticInitializer(String statement) {
staticInitializerSnippet.add(statement);
}
private void addClassField(String type, String var, String def) {
classFieldSnippet.add(type + " " + var + " = " + def + ";", "");
}
private void addStaticField(String type, String var, String def) {
staticFieldSnippet.add("static " + type + " " + var + " = " + def + ";", "");
}
private CodeSnippet createAddToQueueSnippet(int number) {
CodeSnippet annToQueueSnippet = new CodeSnippet();
annToQueueSnippet.add("markedElements[" + number + "].add(nextElement);");
annToQueueSnippet.add("queue.put(nextElement," + number + ");");
return annToQueueSnippet;
}
private String createCodeForForwardElementSet(ForwardElementSet fws) {
DFA dfa = null;
// PathDescription pathDescr = (PathDescription)
// fws.getFirst_isPathOf_GoesTo_PathExpression().getThat();
// PathDescriptionEvaluator pathDescrEval = (PathDescriptionEvaluator)
// vertexEvalGraphMarker.getMark(pathDescr);
// dfa = ((NFA)pathDescrEval.getResult()).getDFA();
NFA nfa = null; // NFA.createSimpleIncidenceTransition_Db();
dfa = nfa.getDFA();
Expression startElementExpr = (Expression) fws.getFirst_isStartExprOf_omega().getThat();
CodeList list = new CodeList();
addImports("org.pcollections.PCollection");
addImports("org.pcollections.PSet");
addImports("java.util.HashSet");
addImports("java.util.BitSet");
addImports("de.uni_koblenz.jgralab.JGraLab");
addImports("de.uni_koblenz.jgralab.GraphElement");
addImports("de.uni_koblenz.jgralab.Incidence");
addImports("de.uni_koblenz.jgralab.greql2.types.pathsearch.ElementStateQueue");
CodeSnippet initSnippet = new CodeSnippet();
list.add(initSnippet);
initSnippet.add("PSet<GraphElement> resultSet = JGraLab.set();");
initSnippet.add("//one BitSet for each state");
initSnippet.add("HashSet<GraphElement>[] markedElements = new HashSet[#stateCount#];");
initSnippet.setVariable("stateCount", Integer.toString(dfa.stateList.size()));
initSnippet.add("for (int i=0; i<#stateCount#;i++) {");
initSnippet.add("\tmarkedElements[i] = new HashSet(100);");
initSnippet.add("}");
initSnippet.add("BitSet finalStates = new BitSet();");
for (State s : dfa.stateList) {
if (s.isFinal) {
initSnippet.add("finalStates.set(" + s.number + ");");
}
}
initSnippet.add(
"GraphElement startElement = (GraphElement)"
+ createCodeForExpression(startElementExpr)
+ ";");
initSnippet.add("ElementStateQueue queue = new ElementStateQueue();");
initSnippet.add("markedElements[" + dfa.initialState.number + "].add(startElement);");
initSnippet.add("int stateNumber;");
initSnippet.add("GraphElement element;");
initSnippet.add("int nextStateNumber;");
initSnippet.add("GraphElement nextElement;");
initSnippet.add("boolean isVertex;");
initSnippet.add("queue.put((GraphElement)v, " + dfa.initialState.number + ");");
initSnippet.add("while (queue.hasNext()) {");
initSnippet.add("\telement = queue.currentElement;");
initSnippet.add("\tstateNumber = queue.currentState;");
initSnippet.add("\tif (finalStates.get(stateNumber)) {");
initSnippet.add("\t\tresultSet = resultSet.plus(element);");
initSnippet.add("\t}");
initSnippet.add("\tisVertex = element instanceof Vertex;");
initSnippet.add("\tfor (Incidence inc = element.getFirstIncidence();");
initSnippet.add(
"\t\tinc != null; inc = isVertex ? inc.getNextIncidenceAtVertex() : inc.getNextIncidenceAtEdge()) {");
initSnippet.add("\t\tswitch (stateNumber) {");
for (State curState : dfa.stateList) {
CodeList stateCodeList = new CodeList();
list.add(stateCodeList);
stateCodeList.add(new CodeSnippet("\t\tcase " + curState.number + ":"));
for (Transition curTrans : curState.outTransitions) {
System.out.println(
"Handling transition "
+ curTrans.getStartState().number
+ " --> "
+ curTrans.endState.number
+ ":"
+ curTrans);
CodeList transitionCodeList = new CodeList();
stateCodeList.add(transitionCodeList);
CodeSnippet transBeginSnippet = new CodeSnippet();
transitionCodeList.addNoIndent(transBeginSnippet);
// Generate code to get next vertex and state number
if (curTrans.consumesIncidence()) {
transBeginSnippet.add("\t\t\tnextElement = isVertex ? inc.getEdge() : inc.getVertex();");
} else {
transBeginSnippet.add("\t\t\tnextElement = element;");
}
// Generate code to check if next element is marked
transBeginSnippet.add(
"\t\t\tif (!markedElements[" + curTrans.endState.number + "].contains(nextElement)) {");
transitionCodeList.add(createCodeForTransition(curTrans), 2);
transitionCodeList.add(new CodeSnippet("\t\t\t}"));
}
stateCodeList.add(new CodeSnippet("\t\tbreak;//break case block"));
}
CodeSnippet finalSnippet = new CodeSnippet();
finalSnippet.add("\t\t}");
finalSnippet.add("\t}");
finalSnippet.add("}");
finalSnippet.add("return resultSet;");
list.add(finalSnippet);
return createMethod(list);
}
private String createCodeForQuantifiedExpression(QuantifiedExpression quantExpr) {
CodeList list = new CodeList();
addImports("org.pcollections.PCollection");
Declaration decl = (Declaration) quantExpr.getFirst_isQuantifiedDeclOf_omega().getThat();
// Declarations and variable iteration loops
int declaredVars = 0;
String tabs = "";
int simpleDecls = 0;
// quantifier
Quantifier quantifier = (Quantifier) quantExpr.getFirst_isQuantifierOf_omega().getThat();
switch (quantifier.get_type()) {
case FORALL:
break;
case EXISTS:
break;
case EXISTSONE:
list.add(new CodeSnippet("boolean result = false;"));
break;
}
scope.blockBegin();
for (IsSimpleDeclOf_isSimpleDeclOf_omega simpleDeclInc :
decl.getIsSimpleDeclOf_isSimpleDeclOf_omegaIncidences()) {
SimpleDeclaration simpleDecl = (SimpleDeclaration) simpleDeclInc.getThat();
Expression domain =
(Expression) simpleDecl.getFirst_isTypeExprOfDeclaration_omega().getThat();
CodeSnippet simpleDeclSnippet = new CodeSnippet();
simpleDeclSnippet.setVariable("simpleDeclNum", Integer.toString(simpleDecls));
simpleDeclSnippet.add(
tabs
+ "PCollection domain_#simpleDeclNum# = (PCollection) "
+ createCodeForExpression(domain)
+ ";");
list.add(simpleDeclSnippet);
for (IsDeclaredVarOf_isDeclaredVarOf_omega declaredVarInc :
simpleDecl.getIsDeclaredVarOf_isDeclaredVarOf_omegaIncidences()) {
declaredVars++;
Variable var = (Variable) declaredVarInc.getThat();
CodeSnippet varIterationSnippet = new CodeSnippet();
varIterationSnippet.setVariable("variableName", var.get_name());
varIterationSnippet.setVariable("simpleDeclNum", Integer.toString(simpleDecls));
varIterationSnippet.add(tabs + "for (Object #variableName# : domain_#simpleDeclNum#) {");
tabs += "\t";
scope.addVariable(var.get_name());
list.add(varIterationSnippet);
}
simpleDecls++;
}
// condition
if (decl.getFirst_isConstraintOf_omega() != null) {
CodeSnippet constraintSnippet = new CodeSnippet();
constraintSnippet.add(tabs + "boolean constraint = true;");
for (IsConstraintOf_isConstraintOf_omega constraintInc :
decl.getIsConstraintOf_isConstraintOf_omegaIncidences()) {
Expression constrExpr = (Expression) constraintInc.getThat();
constraintSnippet.add(
tabs
+ "constraint = constraint && (Boolean) "
+ createCodeForExpression(constrExpr)
+ ";");
}
constraintSnippet.add(tabs + "if (constraint)");
list.add(constraintSnippet);
}
// main expression
Expression resultDefinition =
(Expression) quantExpr.getFirst_isBoundExprOfQuantifiedExpr_omega().getThat();
CodeSnippet iteratedExprSnip = new CodeSnippet();
switch (quantifier.get_type()) {
case FORALL:
iteratedExprSnip.add(
tabs
+ "if ( ! (Boolean) "
+ createCodeForExpression(resultDefinition)
+ ") return false;");
break;
case EXISTS:
iteratedExprSnip.add(
tabs
+ "if ( (Boolean) "
+ createCodeForExpression(resultDefinition)
+ ") return true;");
break;
case EXISTSONE:
iteratedExprSnip.add(
tabs + "if ( (Boolean) " + createCodeForExpression(resultDefinition) + ") {");
iteratedExprSnip.add(tabs + "\tif (result) {");
iteratedExprSnip.add(tabs + "\t\treturn false; //two elements exists");
iteratedExprSnip.add(tabs + "\t} else {");
iteratedExprSnip.add(tabs + "\t\tresult = true; //first element found");
iteratedExprSnip.add(tabs + "\t}");
iteratedExprSnip.add(tabs + "}");
}
list.add(iteratedExprSnip);
// closing parantheses for interation loops
for (int curLoop = 0; curLoop < declaredVars; curLoop++) {
StringBuilder tabBuff = new StringBuilder();
for (int i = 1; i < (declaredVars - curLoop); i++) {
tabBuff.append("\t");
}
tabs = tabBuff.toString();
list.add(new CodeSnippet(tabs + "}"));
}
switch (quantifier.get_type()) {
case FORALL:
list.add(new CodeSnippet("return true;"));
break;
case EXISTSONE:
list.add(new CodeSnippet("return result;"));
break;
case EXISTS:
list.add(new CodeSnippet("return false;"));
}
scope.blockEnd();
String retVal = createMethod(list);
return retVal;
}
private String createCodeForComprehension(Comprehension compr) {
addImports("de.uni_koblenz.jgralab.JGraLab");
addImports("org.pcollections.PCollection");
CodeList list = new CodeList();
CodeSnippet initSnippet = new CodeSnippet();
if (compr instanceof ListComprehension) {
initSnippet.add("PCollection result = JGraLab.vector();");
}
if (compr instanceof SetComprehension) {
initSnippet.add("PCollection result = JGraLab.set();");
}
if (compr instanceof MapComprehension) {
addImports("org.pcollections.PMap");
initSnippet.add("PMap result = JGraLab.map();");
}
list.add(initSnippet);
Declaration decl = (Declaration) compr.getFirst_isCompDeclOf_omega().getThat();
// Declarations and variable iteration loops
int declaredVars = 0;
String tabs = "";
int simpleDecls = 0;
scope.blockBegin();
for (IsSimpleDeclOf_isSimpleDeclOf_omega simpleDeclInc :
decl.getIsSimpleDeclOf_isSimpleDeclOf_omegaIncidences()) {
SimpleDeclaration simpleDecl = (SimpleDeclaration) simpleDeclInc.getThat();
Expression domain =
(Expression) simpleDecl.getFirst_isTypeExprOfDeclaration_omega().getThat();
CodeSnippet simpleDeclSnippet = new CodeSnippet();
simpleDeclSnippet.setVariable("simpleDeclNum", Integer.toString(simpleDecls));
simpleDeclSnippet.add(
tabs
+ "PCollection domain_#simpleDeclNum# = (PCollection) "
+ createCodeForExpression(domain)
+ ";");
list.add(simpleDeclSnippet);
for (IsDeclaredVarOf_isDeclaredVarOf_omega declaredVarInc :
simpleDecl.getIsDeclaredVarOf_isDeclaredVarOf_omegaIncidences()) {
declaredVars++;
Variable var = (Variable) declaredVarInc.getThat();
CodeSnippet varIterationSnippet = new CodeSnippet();
varIterationSnippet.setVariable("variableName", var.get_name());
varIterationSnippet.setVariable("simpleDeclNum", Integer.toString(simpleDecls));
varIterationSnippet.add(tabs + "for (Object #variableName# : domain_#simpleDeclNum#) {");
tabs += "\t";
scope.addVariable(var.get_name());
list.add(varIterationSnippet);
}
simpleDecls++;
}
// condition
if (decl.getFirst_isConstraintOf_omega() != null) {
CodeSnippet constraintSnippet = new CodeSnippet();
constraintSnippet.add(tabs + "boolean constraint = true;");
for (IsConstraintOf_isConstraintOf_omega constraintInc :
decl.getIsConstraintOf_isConstraintOf_omegaIncidences()) {
Expression constrExpr = (Expression) constraintInc.getThat();
constraintSnippet.add(
tabs
+ "constraint = constraint && (Boolean) "
+ createCodeForExpression(constrExpr)
+ ";");
}
constraintSnippet.add(tabs + "if (constraint)");
list.add(constraintSnippet);
}
// main expression
CodeSnippet iteratedExprSnip = new CodeSnippet();
if (compr instanceof MapComprehension) {
Expression keyExpr =
(Expression)
((MapComprehension) compr).getFirst_isKeyExprOfComprehension_omega().getThat();
Expression valueExpr =
(Expression)
((MapComprehension) compr).getFirst_isValueExprOfComprehension_omega().getThat();
iteratedExprSnip.add(
tabs
+ "result.put("
+ createCodeForExpression(keyExpr)
+ ","
+ createCodeForExpression(valueExpr)
+ ");");
} else {
Expression resultDefinition = (Expression) compr.getFirst_isCompResultDefOf_omega().getThat();
iteratedExprSnip.add(
tabs + "result = result.plus(" + createCodeForExpression(resultDefinition) + ");");
}
list.add(iteratedExprSnip);
// closing parantheses for interation loops
for (int curLoop = 0; curLoop < declaredVars; curLoop++) {
StringBuilder tabBuff = new StringBuilder();
for (int i = 1; i < (declaredVars - curLoop); i++) {
tabBuff.append("\t");
}
tabs = tabBuff.toString();
list.add(new CodeSnippet(tabs + "}"));
}
list.add(new CodeSnippet("return result;"));
scope.blockEnd();
String retVal = createMethod(list);
return retVal;
}
// VertexSetExpression
private String createCodeForVertexSetExpression(VertexSetExpression setExpr) {
addImports("org.pcollections.PCollection");
addImports("de.uni_koblenz.jgralab.JGraLab");
addImports("de.uni_koblenz.jgralab.Vertex");
addImports("de.uni_koblenz.jgralab.greql2.types.TypeCollection");
addImports("de.uni_koblenz.jgralab.schema.TypedElementClass");
addImports("java.util.Collection");
addImports("java.util.LinkedList");
CodeList list = new CodeList();
CodeSnippet typeColSnip = new CodeSnippet();
typeColSnip.add("TypeCollection typeCollection = new TypeCollection();");
typeColSnip.add("Collection<TypedElementClass> setOfTypes;");
for (IsTypeRestrOfExpression_isTypeRestrOfExpression_omega inc :
setExpr.getIsTypeRestrOfExpression_isTypeRestrOfExpression_omegaIncidences()) {
TypeId typeId = (TypeId) inc.getThat();
typeColSnip.add("setOfTypes = new LinkedList<TypedElementClass>();");
typeColSnip.add(
"setOfTypes.add(datagraph.getSchema().getAttributedElementClass(\""
+ typeId.get_name()
+ "\"));");
if (typeId.is_type()) {
typeColSnip.add(
"setOfTypes.addAll(datagraph.getSchema().getAttributedElementClass(\""
+ typeId.get_name()
+ "\").getAllSubclasses());");
}
typeColSnip.add("boolean forbidden = " + typeId.is_excluded() + ";");
typeColSnip.add("typeCollection.addTypes(new TypeCollection(setOfTypes, forbidden));");
}
list.add(typeColSnip);
CodeSnippet createVertexSetSnippet = new CodeSnippet();
createVertexSetSnippet.add("PCollection<Vertex> vertexSet = JGraLab.set();");
createVertexSetSnippet.add("for (Vertex v : datagraph.getVertices()) {");
createVertexSetSnippet.add("\tif (typeCollection.acceptsType(v.getType())) {");
createVertexSetSnippet.add("\t\tvertexSet = vertexSet.plus(v);");
createVertexSetSnippet.add("\t}");
createVertexSetSnippet.add("}");
createVertexSetSnippet.add("return vertexSet;");
list.add(createVertexSetSnippet);
return createMethod(list);
}
public CodeBlock createBody() {
CodeList code = new CodeList();
addImports("de.uni_koblenz.jgralab.greql2.executable.*");
addImports("de.uni_koblenz.jgralab.Graph");
code.add(staticFieldSnippet);
code.add(staticInitializerSnippet);
code.add(classFieldSnippet);
Greql2Expression rootExpr = graph.getFirstGreql2Expression();
CodeSnippet method = new CodeSnippet();
method.add("");
method.add("private Graph datagraph;");
method.add("");
method.add(
"public Object execute(de.uni_koblenz.jgralab.Graph graph, java.util.Map<String, Object> boundVariables) {");
method.add("\tObject result = null;");
method.add("\tdatagraph = graph;");
// create code for bound variables
scope.blockBegin();
for (IsBoundVarOf_isBoundVarOf_omega inc :
rootExpr.getIsBoundVarOf_isBoundVarOf_omegaIncidences()) {
Variable var = (Variable) inc.getThat();
scope.addVariable(var.get_name());
method.add(
"\tObject " + var.get_name() + " = boundVariables.get(\"" + var.get_name() + "\");");
}
code.add(method);
// create code for main query expression
IsQueryExprOf_isQueryExprOf_omega inc = rootExpr.getFirst_isQueryExprOf_omega();
Expression queryExpr = (Expression) inc.getThat();
code.add(new CodeSnippet("\tresult = " + createCodeForExpression(queryExpr) + ";"));
// create code for store as
CodeSnippet endOfMethod = new CodeSnippet();
for (IsIdOfStoreClause_isIdOfStoreClause_omega storeInc :
rootExpr.getIsIdOfStoreClause_isIdOfStoreClause_omegaIncidences()) {
Identifier ident = (Identifier) storeInc.getThat();
endOfMethod.add(
"\tboundVariables.put(\"" + ident.get_name() + "\"," + ident.get_name() + ");");
}
scope.blockEnd();
// create code for return and method end
endOfMethod.add("\treturn result;");
endOfMethod.add("}");
code.add(endOfMethod);
// add generated methods
code.add(new CodeSnippet("", ""));
for (CodeBlock methodBlock : createdMethods) {
code.addNoIndent(methodBlock);
code.add(new CodeSnippet("", ""));
}
staticInitializerSnippet.add("}");
return code;
}