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 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 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 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"))))));
}
@Override
protected PreparedExecution implement(
RelDataType rowType,
RelNode rootRel,
SqlKind sqlKind,
ClassDeclaration decl,
Argument[] args) {
RelDataType resultType = rootRel.getRowType();
boolean isDml = sqlKind.belongsTo(SqlKind.DML);
javaCompiler = createCompiler();
EnumerableRelImplementor relImplementor =
getRelImplementor(rootRel.getCluster().getRexBuilder());
BlockExpression expr = relImplementor.implementRoot((EnumerableRel) rootRel);
ParameterExpression root0 = Expressions.parameter(DataContext.class, "root0");
String s =
Expressions.toString(
Blocks.create(
Expressions.declare(
Modifier.FINAL, (ParameterExpression) schema.getExpression(), root0),
expr),
false);
final Executable executable;
try {
executable =
(Executable)
ExpressionEvaluator.createFastScriptEvaluator(
s, Executable.class, new String[] {root0.name});
} catch (Exception e) {
throw Helper.INSTANCE.wrap("Error while compiling generated Java code:\n" + s, e);
}
if (timingTracer != null) {
timingTracer.traceTime("end codegen");
}
if (timingTracer != null) {
timingTracer.traceTime("end compilation");
}
return new PreparedExecution(
null, rootRel, resultType, isDml, mapTableModOp(isDml, sqlKind), null) {
public Object execute() {
return executable.execute(schema);
}
};
}
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));
}
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));
}