public void testClassDecl() {
final NewExpression newExpression =
Expressions.new_(
Object.class,
Collections.<Expression>emptyList(),
Arrays.<MemberDeclaration>asList(
new FieldDeclaration(
Modifier.PUBLIC | Modifier.FINAL,
new ParameterExpression(String.class, "foo"),
Expressions.constant("bar")),
new ClassDeclaration(
Modifier.PUBLIC | Modifier.STATIC,
"MyClass",
null,
Collections.<Type>emptyList(),
Arrays.<MemberDeclaration>asList(
new FieldDeclaration(
0, new ParameterExpression(int.class, "x"), Expressions.constant(0)))),
new FieldDeclaration(0, new ParameterExpression(int.class, "i"), null)));
assertEquals(
"new Object(){\n"
+ " public final String foo = \"bar\";\n"
+ " public static class MyClass {\n"
+ " int x = 0;\n"
+ " }\n"
+ " int i;\n"
+ "}",
Expressions.toString(newExpression));
}
public void testWriteConstant() {
// primitives
assertEquals(
"new int[] {\n" + " 1,\n" + " 2,\n" + " -1}",
Expressions.toString(Expressions.constant(new int[] {1, 2, -1})));
// objects and nulls
assertEquals(
"new String[] {\n" + " \"foo\",\n" + " null}",
Expressions.toString(Expressions.constant(new String[] {"foo", null})));
// automatically call constructor if it matches fields
assertEquals(
"new net.hydromatic.linq4j.test.Linq4jTest.Employee[] {\n"
+ " new net.hydromatic.linq4j.test.Linq4jTest.Employee(\n"
+ " 100,\n"
+ " \"Fred\",\n"
+ " 10),\n"
+ " new net.hydromatic.linq4j.test.Linq4jTest.Employee(\n"
+ " 110,\n"
+ " \"Bill\",\n"
+ " 30),\n"
+ " new net.hydromatic.linq4j.test.Linq4jTest.Employee(\n"
+ " 120,\n"
+ " \"Eric\",\n"
+ " 10),\n"
+ " new net.hydromatic.linq4j.test.Linq4jTest.Employee(\n"
+ " 130,\n"
+ " \"Janet\",\n"
+ " 10)}",
Expressions.toString(Expressions.constant(Linq4jTest.emps)));
}
public Result implement(EnumerableRelImplementor implementor, Prefer pref) {
logger.debug("implementing enumerable");
final DrillImplementor drillImplementor = new DrillImplementor(this.client == null);
DrillRel input = (DrillRel) getChild();
drillImplementor.go(input);
String plan = drillImplementor.getJsonString();
Hook.LOGICAL_PLAN.run(plan);
// not quite sure where this list was supposed to be set earlier, leaving it null got me back
// the full result set
final List<String> fieldNameList = rowType.getFieldNames();
// final List<String> fieldNameList = null;
BlockStatement expr =
new BlockBuilder()
.append(
Expressions.call(
OF_METHOD,
Expressions.constant(plan), //
Expressions.call(
Arrays.class,
"asList", //
Expressions.newArrayInit(
String.class, Functions.apply(fieldNameList, TO_LITERAL)) //
),
Expressions.constant(Object.class), //
Expressions.variable(DataContext.class, "root")))
.toBlock();
final PhysType physType =
PhysTypeImpl.of(
implementor.getTypeFactory(), getRowType(), pref.prefer(JavaRowFormat.ARRAY));
return new Result(expr, physType, JavaRowFormat.ARRAY);
}
private Expression translate0(RexNode expr) {
if (expr instanceof RexInputRef) {
// TODO: multiple inputs, e.g. joins
final Expression input = getInput(0);
final int index = ((RexInputRef) expr).getIndex();
final List<RelDataTypeField> fields = program.getInputRowType().getFieldList();
final RelDataTypeField field = fields.get(index);
if (fields.size() == 1) {
return input;
} else if (input.getType() == Object[].class) {
return Expressions.convert_(
Expressions.arrayIndex(input, Expressions.constant(field.getIndex())),
Types.box(JavaRules.EnumUtil.javaClass(typeFactory, field.getType())));
} else {
return Expressions.field(input, field.getName());
}
}
if (expr instanceof RexLocalRef) {
return translate(program.getExprList().get(((RexLocalRef) expr).getIndex()));
}
if (expr instanceof RexLiteral) {
return Expressions.constant(
((RexLiteral) expr).getValue(), typeFactory.getJavaClass(expr.getType()));
}
if (expr instanceof RexCall) {
final RexCall call = (RexCall) expr;
final SqlOperator operator = call.getOperator();
final ExpressionType expressionType = SQL_TO_LINQ_OPERATOR_MAP.get(operator);
if (expressionType != null) {
switch (operator.getSyntax()) {
case Binary:
return Expressions.makeBinary(
expressionType, translate(call.getOperands()[0]), translate(call.getOperands()[1]));
case Postfix:
case Prefix:
return Expressions.makeUnary(expressionType, translate(call.getOperands()[0]));
default:
throw new RuntimeException("unknown syntax " + operator.getSyntax());
}
}
Method method = SQL_OP_TO_JAVA_METHOD_MAP.get(operator);
if (method != null) {
List<Expression> exprs = translateList(Arrays.asList(call.operands));
return !Modifier.isStatic(method.getModifiers())
? Expressions.call(exprs.get(0), method, exprs.subList(1, exprs.size()))
: Expressions.call(method, exprs);
}
switch (expr.getKind()) {
default:
throw new RuntimeException("cannot translate expression " + expr);
}
}
throw new RuntimeException("cannot translate expression " + expr);
}
public void testWriteArray() {
assertEquals(
"1 + integers[2 + index]",
Expressions.toString(
Expressions.add(
Expressions.constant(1),
Expressions.arrayIndex(
Expressions.variable(int[].class, "integers"),
Expressions.add(
Expressions.constant(2), Expressions.variable(int.class, "index"))))));
}
public void testLambdaCallsBinaryOp() {
// A parameter for the lambda expression.
ParameterExpression paramExpr = Expressions.parameter(Integer.TYPE, "arg");
// This expression represents a lambda expression
// that adds 1 to the parameter value.
FunctionExpression lambdaExpr =
Expressions.lambda(
Expressions.add(paramExpr, Expressions.constant(2)), Arrays.asList(paramExpr));
// Print out the expression.
String s = Expressions.toString(lambdaExpr);
assertEquals(
"new net.hydromatic.linq4j.function.Function1() {\n"
+ " public int apply(Integer arg) {\n"
+ " return arg + 2;\n"
+ " }\n"
+ " public Object apply(Object arg) {\n"
+ " return apply(\n"
+ " (Integer) arg);\n"
+ " }\n"
+ "}\n",
s);
// Compile and run the lambda expression.
// The value of the parameter is 1.
int n = (Integer) lambdaExpr.compile().dynamicInvoke(1);
// This code example produces the following output:
//
// arg => (arg +2)
// 3
assertEquals(3, n);
}
public void testBlockBuilder2() {
BlockBuilder statements = new BlockBuilder();
Expression element = statements.append("element", Expressions.constant(null));
Expression comparator =
statements.append("comparator", Expressions.constant(null, Comparator.class));
Expression treeSet =
statements.append("treeSet", Expressions.new_(TreeSet.class, Arrays.asList(comparator)));
statements.add(Expressions.return_(null, Expressions.call(treeSet, "add", element)));
assertEquals(
"{\n"
+ " final java.util.Comparator comparator = null;\n"
+ " final java.util.TreeSet treeSet = new java.util.TreeSet(\n"
+ " comparator);\n"
+ " return treeSet.add(null);\n"
+ "}\n",
Expressions.toString(statements.toBlock()));
}
public void testBlockBuilder() {
BlockBuilder statements = new BlockBuilder();
Expression one = statements.append("one", Expressions.constant(1));
Expression two = statements.append("two", Expressions.constant(2));
Expression three = statements.append("three", Expressions.add(one, two));
Expression six = statements.append("six", Expressions.multiply(three, two));
Expression eighteen = statements.append("eighteen", Expressions.multiply(three, six));
statements.add(Expressions.return_(null, eighteen));
assertEquals(
"{\n"
+ " final int three = 1 + 2;\n"
+ " final int six = three * 2;\n"
+ " final int eighteen = three * six;\n"
+ " return eighteen;\n"
+ "}\n",
Expressions.toString(statements.toBlock()));
}
public void testWriteWhile() {
DeclarationExpression xDecl, yDecl;
Node node =
Expressions.block(
xDecl = Expressions.declare(0, "x", Expressions.constant(10)),
yDecl = Expressions.declare(0, "y", Expressions.constant(0)),
Expressions.while_(
Expressions.lessThan(xDecl.parameter, Expressions.constant(5)),
Expressions.statement(Expressions.preIncrementAssign(yDecl.parameter))));
assertEquals(
"{\n"
+ " int x = 10;\n"
+ " int y = 0;\n"
+ " while (x < 5) {\n"
+ " ++y;\n"
+ " }\n"
+ "}\n",
Expressions.toString(node));
}
/** Returns the expression to access a table within a schema. */
public static Expression tableExpression(
Schema schema, Type elementType, String tableName, Class clazz) {
final MethodCallExpression expression;
if (Table.class.isAssignableFrom(clazz)) {
expression =
Expressions.call(
schema.getExpression(),
BuiltinMethod.SCHEMA_GET_TABLE.method,
Expressions.constant(tableName));
} else {
expression =
Expressions.call(
BuiltinMethod.SCHEMAS_QUERYABLE.method,
DataContext.ROOT,
schema.getExpression(),
Expressions.constant(elementType),
Expressions.constant(tableName));
}
return Types.castIfNecessary(clazz, expression);
}
/** Returns the expression for a sub-schema. */
public static Expression subSchemaExpression(Schema schema, String name, Class type) {
// (Type) schemaExpression.getSubSchema("name")
Expression call =
Expressions.call(
schema.getExpression(),
BuiltinMethod.SCHEMA_GET_SUB_SCHEMA.method,
Expressions.constant(name));
// CHECKSTYLE: IGNORE 2
//noinspection unchecked
if (false && type != null && !type.isAssignableFrom(Schema.class)) {
return unwrap(call, type);
}
return call;
}
/**
* Converts a schema expression to a given type by calling the {@link
* net.hydromatic.optiq.SchemaPlus#unwrap(Class)} method.
*/
public static Expression unwrap(Expression call, Class type) {
return Expressions.convert_(
Expressions.call(call, BuiltinMethod.SCHEMA_PLUS_UNWRAP.method, Expressions.constant(type)),
type);
}
public void testWrite() {
assertEquals(
"1 + 2.0F + 3L + Long.valueOf(4L)",
Expressions.toString(
Expressions.add(
Expressions.add(
Expressions.add(Expressions.constant(1), Expressions.constant(2F, Float.TYPE)),
Expressions.constant(3L, Long.TYPE)),
Expressions.constant(4L, Long.class))));
assertEquals(
"new java.math.BigDecimal(31415926L, 7)",
Expressions.toString(Expressions.constant(BigDecimal.valueOf(314159260, 8))));
// Parentheses needed, to override the left-associativity of +.
assertEquals(
"1 + (2 + 3)",
Expressions.toString(
Expressions.add(
Expressions.constant(1),
Expressions.add(Expressions.constant(2), Expressions.constant(3)))));
// No parentheses needed; higher precedence of * achieves the desired
// effect.
assertEquals(
"1 + 2 * 3",
Expressions.toString(
Expressions.add(
Expressions.constant(1),
Expressions.multiply(Expressions.constant(2), Expressions.constant(3)))));
assertEquals(
"1 * (2 + 3)",
Expressions.toString(
Expressions.multiply(
Expressions.constant(1),
Expressions.add(Expressions.constant(2), Expressions.constant(3)))));
// Parentheses needed, to overcome right-associativity of =.
assertEquals(
"(1 = 2) = 3",
Expressions.toString(
Expressions.assign(
Expressions.assign(Expressions.constant(1), Expressions.constant(2)),
Expressions.constant(3))));
// Ternary operator.
assertEquals(
"1 < 2 ? (3 < 4 ? 5 : 6) : 7 < 8 ? 9 : 10",
Expressions.toString(
Expressions.condition(
Expressions.lessThan(Expressions.constant(1), Expressions.constant(2)),
Expressions.condition(
Expressions.lessThan(Expressions.constant(3), Expressions.constant(4)),
Expressions.constant(5),
Expressions.constant(6)),
Expressions.condition(
Expressions.lessThan(Expressions.constant(7), Expressions.constant(8)),
Expressions.constant(9),
Expressions.constant(10)))));
assertEquals(
"0 + (double) (2 + 3)",
Expressions.toString(
Expressions.add(
Expressions.constant(0),
Expressions.convert_(
Expressions.add(Expressions.constant(2), Expressions.constant(3)),
Double.TYPE))));
assertEquals(
"a.empno",
Expressions.toString(
Expressions.field(Expressions.parameter(Linq4jTest.Employee.class, "a"), "empno")));
assertEquals(
"java.util.Collections.EMPTY_LIST",
Expressions.toString(Expressions.field(null, Collections.class, "EMPTY_LIST")));
final ParameterExpression paramX = Expressions.parameter(String.class, "x");
assertEquals(
"new net.hydromatic.linq4j.function.Function1() {\n"
+ " public int apply(String x) {\n"
+ " return x.length();\n"
+ " }\n"
+ " public Object apply(Object x) {\n"
+ " return apply(\n"
+ " (String) x);\n"
+ " }\n"
+ "}\n",
Expressions.toString(
Expressions.lambda(
Function1.class,
Expressions.call(paramX, "length", Collections.<Expression>emptyList()),
Arrays.asList(paramX))));
assertEquals(
"new String[] {\n" + " \"foo\",\n" + " null,\n" + " \"bar\\\"baz\"}",
Expressions.toString(
Expressions.newArrayInit(
String.class,
Arrays.<Expression>asList(
Expressions.constant("foo"),
Expressions.constant(null),
Expressions.constant("bar\"baz")))));
assertEquals(
"(int) ((String) (Object) \"foo\").length()",
Expressions.toString(
Expressions.convert_(
Expressions.call(
Expressions.convert_(
Expressions.convert_(Expressions.constant("foo"), Object.class),
String.class),
"length",
Collections.<Expression>emptyList()),
Integer.TYPE)));
// resolving a static method
assertEquals(
"Integer.valueOf(\"0123\")",
Expressions.toString(
Expressions.call(
Integer.class,
"valueOf",
Collections.<Expression>singletonList(Expressions.constant("0123")))));
// precedence of not and instanceof
assertEquals(
"!(o instanceof String)",
Expressions.toString(
Expressions.not(
Expressions.typeIs(Expressions.parameter(Object.class, "o"), String.class))));
// not not
assertEquals(
"!!(o instanceof String)",
Expressions.toString(
Expressions.not(
Expressions.not(
Expressions.typeIs(Expressions.parameter(Object.class, "o"), String.class)))));
}
public void testReturn() {
assertEquals(
"if (true) {\n" + " return;\n" + "}\n",
Expressions.toString(
Expressions.ifThen(Expressions.constant(true), Expressions.return_(null))));
}
public void testWriteAnonymousClass() {
// final List<String> baz = Arrays.asList("foo", "bar");
// new AbstractList<String>() {
// public int size() {
// return baz.size();
// }
// public String get(int index) {
// return ((String) baz.get(index)).toUpperCase();
// }
// }
final ParameterExpression bazParameter =
Expressions.parameter(Types.of(List.class, String.class), "baz");
final ParameterExpression indexParameter = Expressions.parameter(Integer.TYPE, "index");
BlockExpression e =
Expressions.block(
Expressions.declare(
Modifier.FINAL,
bazParameter,
Expressions.call(
Arrays.class,
"asList",
Arrays.<Expression>asList(
Expressions.constant("foo"), Expressions.constant("bar")))),
Expressions.statement(
Expressions.new_(
Types.of(AbstractList.class, String.class),
Collections.<Expression>emptyList(),
Arrays.<MemberDeclaration>asList(
Expressions.fieldDecl(
Modifier.PUBLIC | Modifier.FINAL,
Expressions.parameter(String.class, "qux"),
Expressions.constant("xyzzy")),
Expressions.methodDecl(
Modifier.PUBLIC,
Integer.TYPE,
"size",
Collections.<ParameterExpression>emptyList(),
Blocks.toFunctionBlock(
Expressions.call(
bazParameter, "size", Collections.<Expression>emptyList()))),
Expressions.methodDecl(
Modifier.PUBLIC,
String.class,
"get",
Arrays.asList(indexParameter),
Blocks.toFunctionBlock(
Expressions.call(
Expressions.convert_(
Expressions.call(
bazParameter,
"get",
Arrays.<Expression>asList(indexParameter)),
String.class),
"toUpperCase",
Collections.<Expression>emptyList())))))));
assertEquals(
"{\n"
+ " final java.util.List<String> baz = java.util.Arrays.asList(\"foo\", \"bar\");\n"
+ " new java.util.AbstractList<String>(){\n"
+ " public final String qux = \"xyzzy\";\n"
+ " public int size() {\n"
+ " return baz.size();\n"
+ " }\n"
+ "\n"
+ " public String get(int index) {\n"
+ " return ((String) baz.get(index)).toUpperCase();\n"
+ " }\n"
+ "\n"
+ " };\n"
+ "}\n",
Expressions.toString(e));
}
@Override
public Expression apply(String a0) {
return Expressions.constant(a0);
}
