Java ParameterExpression类代码示例

import org.apache.calcite.linq4j.tree.ParameterExpression; //导入依赖的package包/类
@Test public void testLambdaCallsTwoArgMethod() throws NoSuchMethodException {
  // A parameter for the lambda expression.
  ParameterExpression paramS =
      Expressions.parameter(String.class, "s");
  ParameterExpression paramBegin =
      Expressions.parameter(Integer.TYPE, "begin");
  ParameterExpression paramEnd =
      Expressions.parameter(Integer.TYPE, "end");

  // This expression represents a lambda expression
  // that adds 1 to the parameter value.
  FunctionExpression lambdaExpr =
      Expressions.lambda(
          Expressions.call(
              paramS,
              String.class.getMethod(
                  "substring", Integer.TYPE, Integer.TYPE),
              paramBegin,
              paramEnd), paramS, paramBegin, paramEnd);

  // Compile and run the lambda expression.
  String s =
      (String) lambdaExpr.compile().dynamicInvoke("hello world", 3, 7);

  assertEquals("lo w", s);
}
 

import org.apache.calcite.linq4j.tree.ParameterExpression; //导入依赖的package包/类
@Test public void testWriteTryCatch() {
  final ParameterExpression cce_ =
      Expressions.parameter(Modifier.FINAL, ClassCastException.class, "cce");
  final ParameterExpression re_ =
      Expressions.parameter(0, RuntimeException.class, "re");
  Node node =
      Expressions.tryCatch(
          Expressions.block(
              Expressions.return_(null,
                  Expressions.call(Expressions.constant("foo"), "length"))),
          Expressions.catch_(cce_,
              Expressions.return_(null, Expressions.constant(null))),
          Expressions.catch_(re_,
              Expressions.return_(null,
                  Expressions.call(re_, "toString"))));
  assertEquals(
      "try {\n"
          + "  return \"foo\".length();\n"
          + "} catch (final ClassCastException cce) {\n"
          + "  return null;\n"
          + "} catch (RuntimeException re) {\n"
          + "  return re.toString();\n"
          + "}\n",
      Expressions.toString(node));
}
 

import org.apache.calcite.linq4j.tree.ParameterExpression; //导入依赖的package包/类
@Test public void testCompile() throws NoSuchMethodException {
  // Creating a parameter for the expression tree.
  ParameterExpression param = Expressions.parameter(String.class);

  // Creating an expression for the method call and specifying its
  // parameter.
  MethodCallExpression methodCall =
      Expressions.call(
          Integer.class,
          "valueOf",
          Collections.<Expression>singletonList(param));

  // The following statement first creates an expression tree,
  // then compiles it, and then runs it.
  int x =
      Expressions.<Function1<String, Integer>>lambda(
          methodCall,
          new ParameterExpression[] { param })
          .getFunction()
          .apply("1234");
  assertEquals(1234, x);
}
 

import org.apache.calcite.linq4j.tree.ParameterExpression; //导入依赖的package包/类
@Test public void testFor() throws NoSuchFieldException {
  final BlockBuilder builder = new BlockBuilder();
  final ParameterExpression i_ = Expressions.parameter(int.class, "i");
  builder.add(
      Expressions.for_(
          Expressions.declare(
              0, i_, Expressions.constant(0)),
          Expressions.lessThan(i_, Expressions.constant(10)),
          Expressions.postIncrementAssign(i_),
          Expressions.block(
              Expressions.statement(
                  Expressions.call(
                      Expressions.field(
                          null, System.class.getField("out")),
                      "println",
                      i_)))));
  assertEquals(
      "{\n"
          + "  for (int i = 0; i < 10; i++) {\n"
          + "    System.out.println(i);\n"
          + "  }\n"
          + "}\n",
      Expressions.toString(builder.toBlock()));
}
 

import org.apache.calcite.linq4j.tree.ParameterExpression; //导入依赖的package包/类
@Test public void testNoInlineMultipleUsage() {
  ParameterExpression p1 = Expressions.parameter(int.class, "p1");
  ParameterExpression p2 = Expressions.parameter(int.class, "p2");
  DeclarationStatement decl = Expressions.declare(16, "x",
      Expressions.subtract(p1, p2));
  b.add(decl);
  b.add(
      Expressions.return_(null,
          Expressions.add(decl.parameter, decl.parameter)));
  assertEquals(
      "{\n"
          + "  final int x = p1 - p2;\n"
          + "  return x + x;\n"
          + "}\n",
      b.toBlock().toString());
}
 

import org.apache.calcite.linq4j.tree.ParameterExpression; //导入依赖的package包/类
@Test public void testAssignInConditionMultipleUsage() {
  // int t;
  // return (t = 1) != a ? t : c
  final BlockBuilder builder = new BlockBuilder(true);
  final ParameterExpression t = Expressions.parameter(int.class, "t");

  builder.add(Expressions.declare(0, t, null));

  Expression v = builder.append("v",
      Expressions.makeTernary(ExpressionType.Conditional,
          Expressions.makeBinary(ExpressionType.NotEqual,
              Expressions.assign(t, Expressions.constant(1)),
              Expressions.parameter(int.class, "a")),
          t,
          Expressions.parameter(int.class, "c")));
  builder.add(Expressions.return_(null, v));
  assertEquals(
      "{\n"
          + "  int t;\n"
          + "  return (t = 1) != a ? t : c;\n"
          + "}\n",
      Expressions.toString(builder.toBlock()));
}
 

import org.apache.calcite.linq4j.tree.ParameterExpression; //导入依赖的package包/类
void checkAssignInConditionOptimizedOut(int modifiers, String s) {
  // int t;
  // return (t = 1) != a ? b : c
  final BlockBuilder builder = new BlockBuilder(true);
  final ParameterExpression t =
      Expressions.parameter(int.class, "t");

  builder.add(Expressions.declare(modifiers, t, null));

  Expression v = builder.append("v",
      Expressions.makeTernary(ExpressionType.Conditional,
          Expressions.makeBinary(ExpressionType.NotEqual,
              Expressions.assign(t, Expressions.constant(1)),
              Expressions.parameter(int.class, "a")),
          Expressions.parameter(int.class, "b"),
          Expressions.parameter(int.class, "c")));
  builder.add(Expressions.return_(null, v));
  assertThat(Expressions.toString(builder.toBlock()),
      CoreMatchers.equalTo(s));
}
 

import org.apache.calcite.linq4j.tree.ParameterExpression; //导入依赖的package包/类
@Test public void testAssignInConditionMultipleUsageNonOptimized() {
  // int t = 2;
  // return (t = 1) != a ? 1 : c
  final BlockBuilder builder = new BlockBuilder(true);
  final ParameterExpression t = Expressions.parameter(int.class, "t");

  builder.add(Expressions.declare(0, t, TWO));

  Expression v = builder.append("v",
      Expressions.makeTernary(ExpressionType.Conditional,
          Expressions.makeBinary(ExpressionType.NotEqual,
              Expressions.assign(t, Expressions.constant(1)),
              Expressions.parameter(int.class, "a")),
          t,
          Expressions.parameter(int.class, "c")));
  builder.add(Expressions.return_(null, v));
  assertEquals(
      "{\n"
          + "  int t = 2;\n"
          + "  return (t = 1) != a ? t : c;\n"
          + "}\n",
      Expressions.toString(builder.toBlock()));
}
 

import org.apache.calcite.linq4j.tree.ParameterExpression; //导入依赖的package包/类
@Test public void testMultiPassOptimization() {
  // int t = u + v;
  // boolean b = t > 1 ? true : true; -- optimized out, thus t can be inlined
  // return b ? t : 2
  final BlockBuilder builder = new BlockBuilder(true);
  final ParameterExpression u = Expressions.parameter(int.class, "u");
  final ParameterExpression v = Expressions.parameter(int.class, "v");

  Expression t = builder.append("t", Expressions.add(u, v));
  Expression b = builder.append("b",
      Expressions.condition(Expressions.greaterThan(t, ONE), TRUE, TRUE));

  builder.add(Expressions.return_(null, Expressions.condition(b, t, TWO)));
  assertEquals(
      "{\n"
          + "  return u + v;\n"
          + "}\n",
      Expressions.toString(builder.toBlock()));
}
 

import org.apache.calcite.linq4j.tree.ParameterExpression; //导入依赖的package包/类
@Test public void testFactorOutBinaryAdd() {
  assertThat(
      optimize(
          Expressions.new_(
              Runnable.class,
              Collections.<Expression>emptyList(),
              Expressions.methodDecl(
                  0,
                  int.class,
                  "test",
                  Collections.<ParameterExpression>emptyList(),
                  Blocks.toFunctionBlock(Expressions.add(ONE, TWO))))),
      equalTo("{\n"
          + "  return new Runnable(){\n"
          + "      int test() {\n"
          + "        return $L4J$C$1_2;\n"
          + "      }\n"
          + "\n"
          + "      static final int $L4J$C$1_2 = 1 + 2;\n"
          + "    };\n"
          + "}\n"));
}
 

import org.apache.calcite.linq4j.tree.ParameterExpression; //导入依赖的package包/类
@Test public void testFactorOutBinaryAddSurvivesMultipleOptimizations() {
  assertThat(
      optimize(
          optimizeExpression(
              Expressions.new_(Runnable.class,
                  Collections.<Expression>emptyList(),
                  Expressions.methodDecl(0,
                      int.class,
                      "test",
                      Collections.<ParameterExpression>emptyList(),
                      Blocks.toFunctionBlock(Expressions.add(ONE, TWO)))))),
      equalTo("{\n"
          + "  return new Runnable(){\n"
          + "      int test() {\n"
          + "        return $L4J$C$1_2;\n"
          + "      }\n"
          + "\n"
          + "      static final int $L4J$C$1_2 = 1 + 2;\n"
          + "    };\n"
          + "}\n"));
}
 

import org.apache.calcite.linq4j.tree.ParameterExpression; //导入依赖的package包/类
@Test public void testFactorOutBinaryAddNameCollision() {
  assertThat(
      optimize(
          Expressions.new_(
              Runnable.class,
              Collections.<Expression>emptyList(),
              Expressions.methodDecl(
                  0,
                  int.class,
                  "test",
                  Collections.<ParameterExpression>emptyList(),
                  Blocks.toFunctionBlock(
                      Expressions.multiply(Expressions.add(ONE, TWO),
                          Expressions.subtract(ONE, TWO)))))),
      equalTo("{\n"
          + "  return new Runnable(){\n"
          + "      int test() {\n"
          + "        return $L4J$C$1_2_1_20;\n"
          + "      }\n"
          + "\n"
          + "      static final int $L4J$C$1_2 = 1 + 2;\n"
          + "      static final int $L4J$C$1_20 = 1 - 2;\n"
          + "      static final int $L4J$C$1_2_1_20 = $L4J$C$1_2 * $L4J$C$1_20;\n"
          + "    };\n"
          + "}\n"));
}
 

import org.apache.calcite.linq4j.tree.ParameterExpression; //导入依赖的package包/类
@Test public void testFactorOutBinaryAddMul() {
  assertThat(
      optimize(
          Expressions.new_(
              Runnable.class,
              Collections.<Expression>emptyList(),
              Expressions.methodDecl(
                  0,
                  int.class,
                  "test",
                  Collections.<ParameterExpression>emptyList(),
                  Blocks.toFunctionBlock(
                      Expressions.multiply(Expressions.add(ONE, TWO),
                          THREE))))),
      equalTo("{\n"
          + "  return new Runnable(){\n"
          + "      int test() {\n"
          + "        return $L4J$C$1_2_3;\n"
          + "      }\n"
          + "\n"
          + "      static final int $L4J$C$1_2 = 1 + 2;\n"
          + "      static final int $L4J$C$1_2_3 = $L4J$C$1_2 * 3;\n"
          + "    };\n"
          + "}\n"));
}
 

import org.apache.calcite.linq4j.tree.ParameterExpression; //导入依赖的package包/类
@Test public void testNewBigInteger() {
  assertThat(
      optimize(
          Expressions.new_(
              Runnable.class,
              Collections.<Expression>emptyList(),
              Expressions.methodDecl(
                  0, int.class, "test",
                  Collections.<ParameterExpression>emptyList(),
                  Blocks.toFunctionBlock(
                      Expressions.new_(BigInteger.class,
                          Expressions.constant("42")))))),
      equalTo("{\n"
          + "  return new Runnable(){\n"
          + "      int test() {\n"
          + "        return $L4J$C$new_java_math_BigInteger_42_;\n"
          + "      }\n"
          + "\n"
          + "      static final java.math.BigInteger "
          + "$L4J$C$new_java_math_BigInteger_42_ = new java.math.BigInteger(\n"
          + "        \"42\");\n"
          + "    };\n"
          + "}\n"));
}
 

import org.apache.calcite.linq4j.tree.ParameterExpression; //导入依赖的package包/类
@Test public void testInstanceofTest() {
  // Single instanceof is not optimized
  assertThat(
      optimize(
          Expressions.new_(
              Runnable.class,
              Collections.<Expression>emptyList(),
              Expressions.methodDecl(
                  0, int.class, "test",
                  Collections.<ParameterExpression>emptyList(),
                  Blocks.toFunctionBlock(
                      Expressions.typeIs(ONE, Boolean.class))))),
      equalTo("{\n"
          + "  return new Runnable(){\n"
          + "      int test() {\n"
          + "        return 1 instanceof Boolean;\n"
          + "      }\n"
          + "\n"
          + "    };\n"
          + "}\n"));
}