ContextBuilderTest.java example

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/*
 * Copyright (C) 2011 Red Hat, Inc. and/or its affiliates.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.jboss.errai.codegen.test;

import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;

import java.util.List;

import javax.enterprise.util.TypeLiteral;

import org.jboss.errai.codegen.Context;
import org.jboss.errai.codegen.Variable;
import org.jboss.errai.codegen.VariableReference;
import org.jboss.errai.codegen.builder.impl.ContextBuilder;
import org.jboss.errai.codegen.builder.impl.ObjectBuilder;
import org.jboss.errai.codegen.exception.InvalidTypeException;
import org.jboss.errai.codegen.literal.LiteralFactory;
import org.jboss.errai.codegen.meta.MetaClassFactory;
import org.jboss.errai.codegen.util.Stmt;
import org.junit.Assert;
import org.junit.Test;

/**
 * Tests the {@link org.jboss.errai.codegen.builder.impl.ContextBuilder} API.
 * 
 * @author Christian Sadilek <csadilek@redhat.com>
 */
public class ContextBuilderTest extends AbstractCodegenTest {

  @Test
  public void testDeclareVariableWithExactTypeProvided() {
    String declaration = ContextBuilder.create()
        .declareVariable("n", Integer.class)
        .initializeWith(10)
        .toJavaString();
      
    assertEquals("failed to generate variable declaration using a literal initialization",
        "Integer n = 10;", declaration);
  }

  @Test
  public void testDeclareVariableWithTypeLiteral() {
    @SuppressWarnings("serial")
    String declaration = ContextBuilder.create(Context.create().autoImport())
        .declareVariable("list", new TypeLiteral<List<String>>() {})
        .finish()
        .toJavaString();
      
    assertEquals("failed to generate variable declaration using a type literal",
        "List<String> list;", declaration);
  }
  
  @Test
  public void testDeclareVariableWithIntegerTypeInference() {
    String declaration = ContextBuilder.create()
        .declareVariable("n")
        .initializeWith(10)
        .toJavaString();

    assertEquals("failed to generate variable declaration using a literal initialization and type inference",
        "Integer n = 10;", declaration);
  }

  @Test
  public void testDeclareVariableWithStringTypeInference() {
    String declaration = ContextBuilder.create()
        .declareVariable("n")
        .initializeWith("10")
        .toJavaString();

    assertEquals("failed to generate variable declaration using a literal initialization and type inference",
        "String n = \"10\";", declaration);
  }

  @Test
  public void testDeclareVariableWithImplicitTypeConversion() {
    String declaration = ContextBuilder.create()
        .declareVariable("n", Integer.class)
        .initializeWith("10")
        .toJavaString();

    assertEquals("failed to generate variable declaration using a literal initialization and type conversion",
        "Integer n = 10;", declaration);
  }

  @Test
  public void testDeclareVariableWithInvalidInitialization() {
    try {
      ContextBuilder.create()
          .declareVariable("n", Integer.class)
          .initializeWith("abc")
          .toJavaString();
      fail("Expected InvalidTypeException");
    }
    catch (InvalidTypeException ive) {
      // expected
      assertTrue(ive.getCause() instanceof NumberFormatException);
    }
  }

  @Test
  public void testDeclareVariableWithObjectInitialization() {
    String declaration = ContextBuilder.create()
        .declareVariable("str", String.class)
        .initializeWith(ObjectBuilder.newInstanceOf(String.class))
        .toJavaString();

    assertEquals("failed to generate variable declaration using an objectbuilder initialization",
        "String str = new String();", declaration);
  }

  @Test
  public void testDeclareVariableWithObjectInitializationWithParameters() {
    String declaration = ContextBuilder.create()
        .declareVariable("str", String.class)
        .initializeWith(ObjectBuilder.newInstanceOf(String.class).withParameters("abc"))
        .toJavaString();

    assertEquals("failed to generate variable declaration using an objectbuilder initialization with parameters",
        "String str = new String(\"abc\");", declaration);
  }

  @Test
  public void testDeclareVariableWithObjectInitializationUsingSuperClassType() {

    String declaration = ContextBuilder.create()
        .declareVariable("str", Object.class)
        .initializeWith(ObjectBuilder.newInstanceOf(String.class).withParameters("abc"))
        .toJavaString();

    assertEquals("failed to generate variable declaration using an objectbuilder initialization with parameters",
        "Object str = new String(\"abc\");", declaration);

    try {
      Stmt.declareVariable("str", Integer.class, ObjectBuilder.newInstanceOf(String.class).withParameters("abc"))
          .toJavaString();
      fail("Expected InvalidTypeException");
    }
    catch (InvalidTypeException e) {
      // expected
    }

    try {
      Stmt.declareVariable("str", String.class, ObjectBuilder.newInstanceOf(Object.class))
          .toJavaString();
      fail("Expected InvalidTypeException");
    }
    catch (InvalidTypeException e) {
      // expected
    }
  }

  @Test
  public void testAddVariableWithExactTypeProvided() {
    Context ctx = ContextBuilder.create().addVariable("n", Integer.class, 10).getContext();

    VariableReference n = ctx.getVariable("n");
    assertEquals("Wrong variable name", "n", n.getName());
    Assert.assertEquals("Wrong variable type", MetaClassFactory.get(Integer.class), n.getType());
    Assert.assertEquals("Wrong variable value", LiteralFactory.getLiteral(10), n.getValue());
  }

  @Test
  public void testAddVariableWithIntegerTypeInference() {
    Context ctx = ContextBuilder.create().addVariable("n", 10).getContext();

    VariableReference n = ctx.getVariable("n");
    assertEquals("Wrong variable name", "n", n.getName());
    Assert.assertEquals("Wrong variable type", MetaClassFactory.get(Integer.class), n.getType());
    Assert.assertEquals("Wrong variable value", LiteralFactory.getLiteral(10), n.getValue());
  }

  @Test
  public void testAddVariableWithStringTypeInference() {
    Context ctx = ContextBuilder.create().addVariable("n", "10").getContext();

    VariableReference n = ctx.getVariable("n");
    assertEquals("Wrong variable name", "n", n.getName());
    Assert.assertEquals("Wrong variable type", MetaClassFactory.get(String.class), n.getType());
    Assert.assertEquals("Wrong variable value", LiteralFactory.getLiteral("10"), n.getValue());
  }

  @Test
  public void testAddVariableWithImplicitTypeConversion() {
    Context ctx = ContextBuilder.create().addVariable("n", Integer.class, "10").getContext();

    VariableReference n = ctx.getVariable("n");
    assertEquals("Wrong variable name", "n", n.getName());
    Assert.assertEquals("Wrong variable type", MetaClassFactory.get(Integer.class), n.getType());
    Assert.assertEquals("Wrong variable value", LiteralFactory.getLiteral(10), n.getValue());

    try {
      Stmt.create(ContextBuilder.create().addVariable("n", Integer.class, "abc").getContext()).toJavaString();
      fail("Expected InvalidTypeException");
    }
    catch (InvalidTypeException ive) {
      // expected
      assertTrue(ive.getCause() instanceof NumberFormatException);
    }
  }

  @Test
  public void testAddVariableWithObjectInitializationWithExactTypeProvided() {
    Context ctx = ContextBuilder.create().addVariable("str", String.class,
        ObjectBuilder.newInstanceOf(String.class)).getContext();

    VariableReference str = ctx.getVariable("str");
    assertEquals("Wrong variable name", "str", str.getName());
    Assert.assertEquals("Wrong variable type", MetaClassFactory.get(String.class), str.getType());
    
    // variable value cannot be verified before initialization statement was generated.
    Variable v = ctx.getVariables().get("str");
    v.generate(ctx);
    assertNotNull("Value could not be generated", v.getValue());
  }

  @Test
  public void testAddVariableWithObjectInitializationWithStringTypeInference() {
    Context ctx = ContextBuilder.create().addVariable("str", ObjectBuilder.newInstanceOf(String.class)).getContext();

    VariableReference str = ctx.getVariable("str");
    assertEquals("Wrong variable name", "str", str.getName());
    
    // variable type and value cannot be verified before initialization statement was generated.
    Variable v = ctx.getVariables().get("str");
    v.generate(ctx);
    assertNotNull("Value could not be generated", v.getValue());
    Assert.assertEquals("Wrong variable type", MetaClassFactory.get(String.class), v.getType());
  }
}