BOEM

Builder Of EMF Models

The aim of the BOEM library is to provide an API that eases the creation of EMF Model using XTend syntax. Using such syntax helps to:

• Speed up the creation of tests
• Improve the readability of the tests
• Improve maintainability when the tested metamodel changes
• Ease the creation of inter-connected models

It has been created and used in industrial project to ease the creation input for JUnit tests on the metamodel and business rules.

Installation

Install the feature BOEM Feature (fr.ibp.odv.boem.feature) from one of the following update sites:

1.0.0 Nightly Update Site

Usage

How to start

Create a BOEM factory

extension BoemFactory factory = new BoemFactory(YourMM.eINSTANCE)

Use the keyword extension in order to use all public methods from the BOEM factory anywhere in your class

Import static APIs

import static extension fr.ibp.odv.boem.lib.Boems.*

Examples

All the examples use the following metamodel:

How to create an element

// Simple creation
val model = A.build [
  name = "AName"
].buildTree

How to add children

val model = A.build [
  name = "AName";
  // Single valued containment feature
  childNodeA = Node.build [
    name = "SingleChildName"
  ]
  // Adds one child
  childrenNodeA += Node.build [
    name = "ANodeName0"
  ]
  // Adds several children at once
  childrenNodeA += #[
    Node.build [
      name = "ANodeName1"
    ],
    Node.build [
      name = "ANodeName2"
    ]
  ]
].buildTree

How to add pointers to created objects

val model = B.build [
  name = "AName"
  // Adds one child with reference
    childrenNodeA += "id0" >> Node.build [
      name = "ANodeName0"
  ]
  // Adds several children at once with references
  childrenNodeA += #[
    "id1" >> Node.build [
      name = "ANodeName1"
    ],
    "id2" >> Node.build [
      name = "ANodeName2"
    ]
  ]
  // Adds several children at once with references
  childrenNodeB += #[
    "id3" >> Node.build [
      name = "ANodeName3"
    ],
    "id4" >> Node.build [
      name = "ANodeName4"
    ]
  ]
].buildTree
// Accessing node
assertEquals("ANodeName0", model.access(Node, "id0").name)
assertEquals("ANodeName1", model.access(Node, "id1").name)
assertEquals("ANodeName2", model.access(Node, "id2").name)
assertEquals(2, model.root.childrenNodeB.size)
assertEquals("ANodeName3", model.access(Node, "id3").name)
assertEquals("ANodeName4", model.access(Node, "id4").name)

You can even register an id provider against the BoemFactory. It will compute an id for each element (at build time) using your rules. For example:

extension BoemFactory factory = new BoemFactory(BoemTestPackage.eINSTANCE).registerIdProvider([
  if (it instanceof NamedElement) {
    return it.name
  }
  return null
])
//...
val model = B.build [
  name = "AName"
  // Adds one child with reference
  childrenNodeA += Node.build [
    name = "ANodeName0"
  ]
  // Adds several children at once with references
  childrenNodeA += #[
    Node.build [
      name = "ANodeName1"
    ],
    Node.build [
      name = "ANodeName2"
    ]
  ]
  // Adds several children at once with references
  childrenNodeB += #[
    Node.build [
      name = "ANodeName3"
    ],
    Node.build [
      name = "ANodeName4"
    ]
  ]
].buildTree
// Accessing node
assertEquals("ANodeName0", model.access(Node, "ANodeName0").name)
assertEquals("ANodeName1", model.access(Node, "ANodeName1").name)
assertEquals("ANodeName2", model.access(Node, "ANodeName2").name)
assertEquals(2, model.root.childrenNodeB.size)
assertEquals("ANodeName3", model.access(Node, "ANodeName3").name)
assertEquals("ANodeName4", model.access(Node, "ANodeName4").name)

You can also use a shorter syntax to access your elements

val model = A.build [
  name = "AName"
  childrenNodeA += "id1" >> Node.build [
    name = "ANode"
  ]
].buildTree
val target = model.access(Node, "id1");
val target2 = ("id1" => model) as Node
assertTrue(target2 == target)
val target3 = model.access("id1")
assertTrue(target3 == target)
assertTrue(target == "id1" => model)

How to create references

val it = A.build [
  name = "AName"
  autoContainementA += "id0" >> B.build [
    referenceNodeA = Node.buildRef("id1")
  ]
  childrenNodeA += "id1" >> Node.build [
    name = "ANode"
  ]
].buildTree

or with a shorter syntax

val it = A.build [
  name = "AName"
  autoContainementA += "id0" >> B.build [
    referenceNodeA = Node << "id1"
  ]
  childrenNodeA += "id1" >> Node.build [
    name = "ANode"
  ]
].buildTree

How to update an element

val model = A.build [
  autoContainementA += "B" >> B.build [
    autoContainementA += "D" >> C.build
  ]
].buildTree
assertEquals(null, model.root.name)
assertEquals(null, model.access(NamedElement, "B").name)
assertEquals(null, model.access(A, "C").name)
model.update [
  name = "NameA"
  autoContainementA.get(0).with [
    name = "NameB"
    autoContainementA.get(0).with [
      name = "NameD"
    ]
  ]
]
assertEquals("NameA", model.root.name)
assertEquals("NameB", model.access(B, "B").name)
assertEquals("NameC", model.access(C, "C").name)
model.access(B, "B").name = "NameB2"
model.access(C, "C").name = "NameB2"
assertEquals("NameB2", model.access(B, "B").name)
assertEquals("NameC2", model.access(C, "C").name)

Presentations

• Eclipse Con France 2018

Contributing

1. Fork it!
2. Create your feature branch: git checkout -b my-new-feature
3. Commit your changes: git commit -am 'Add some feature'
4. Push to the branch: git push origin my-new-feature
5. Submit a pull request

License

Eclipse Public License - v 1.0
Contribution guidelines for this project