Add a convenience AstTransformation base class for BOMs

Plugin authors can extend this class, provide missing methods,
and specify a BOM to add to the dependency management lookup
(i.e. dependencies by artifactId)

spring-boot-cli/src/test/java/org/springframework/boot/cli/compiler/GenericBomAstTransformationTests.java

@@ -0,0 +1,123 @@
+/*
+ * Copyright 2012-2015 the original author or authors.
+ *
+ * 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.springframework.boot.cli.compiler;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.codehaus.groovy.ast.ASTNode;
+import org.codehaus.groovy.ast.AnnotationNode;
+import org.codehaus.groovy.ast.ClassHelper;
+import org.codehaus.groovy.ast.ClassNode;
+import org.codehaus.groovy.ast.ModuleNode;
+import org.codehaus.groovy.ast.PackageNode;
+import org.codehaus.groovy.ast.expr.ConstantExpression;
+import org.codehaus.groovy.ast.expr.Expression;
+import org.codehaus.groovy.ast.expr.ListExpression;
+import org.codehaus.groovy.control.SourceUnit;
+import org.codehaus.groovy.control.io.ReaderSource;
+import org.codehaus.groovy.transform.ASTTransformation;
+import org.junit.Test;
+import org.springframework.boot.groovy.DependencyManagementBom;
+
+import static org.junit.Assert.assertEquals;
+
+/**
+ * Tests for {@link ResolveDependencyCoordinatesTransformation}
+ *
+ * @author Andy Wilkinson
+ */
+public final class GenericBomAstTransformationTests {
+
+	private final SourceUnit sourceUnit = new SourceUnit((String) null,
+			(ReaderSource) null, null, null, null);
+
+	private final ModuleNode moduleNode = new ModuleNode(this.sourceUnit);
+
+	private final ASTTransformation transformation = new GenericBomAstTransformation() {
+
+		@Override
+		public int getOrder() {
+			return DependencyManagementBomTransformation.ORDER - 10;
+		}
+
+		@Override
+		protected String getBomModule() {
+			return "test:child:1.0.0";
+		}
+	};
+
+	@Test
+	public void transformationOfEmptyPackage() {
+		this.moduleNode.setPackage(new PackageNode("foo"));
+		this.transformation.visit(new ASTNode[] { this.moduleNode }, this.sourceUnit);
+		assertEquals("[test:child:1.0.0]", getValue().toString());
+	}
+
+	@Test
+	public void transformationOfClass() {
+		this.moduleNode.addClass(ClassHelper.make("MyClass"));
+		this.transformation.visit(new ASTNode[] { this.moduleNode }, this.sourceUnit);
+		assertEquals("[test:child:1.0.0]", getValue().toString());
+	}
+
+	@Test
+	public void transformationOfClassWithExistingManagedDependencies() {
+		this.moduleNode.setPackage(new PackageNode("foo"));
+		ClassNode cls = ClassHelper.make("MyClass");
+		this.moduleNode.addClass(cls);
+		AnnotationNode annotation = new AnnotationNode(
+				ClassHelper.make(DependencyManagementBom.class));
+		annotation.addMember("value", new ConstantExpression("test:parent:1.0.0"));
+		cls.addAnnotation(annotation);
+		this.transformation.visit(new ASTNode[] { this.moduleNode }, this.sourceUnit);
+		assertEquals("[test:parent:1.0.0, test:child:1.0.0]", getValue().toString());
+	}
+
+	private List<String> getValue() {
+		Expression expression = findAnnotation().getMember("value");
+		if (expression instanceof ListExpression) {
+			List<String> list = new ArrayList<String>();
+			for (Expression ex : ((ListExpression) expression).getExpressions()) {
+				list.add((String) ((ConstantExpression) ex).getValue());
+			}
+			return list;
+		}
+		else if (expression == null) {
+			return null;
+		}
+		else {
+			throw new IllegalStateException("Member 'value' is not a ListExpression");
+		}
+	}
+
+	private AnnotationNode findAnnotation() {
+		PackageNode pkg = this.moduleNode.getPackage();
+		ClassNode bom = ClassHelper.make(DependencyManagementBom.class);
+		if (pkg != null) {
+			if (!pkg.getAnnotations(bom).isEmpty()) {
+				return pkg.getAnnotations(bom).get(0);
+			}
+		}
+		if (!this.moduleNode.getClasses().isEmpty()) {
+			ClassNode cls = this.moduleNode.getClasses().get(0);
+			return cls.getAnnotations(bom).get(0);
+		}
+		throw new IllegalStateException("No package or class node found");
+	}
+
+}