Allow gradle builds without version numbers

Add a gradle `ResolutionStrategy` that resolves missing version numbers
using the `spring-boot-dependencies` POM.

This commit also introduces a new `spring-boot-dependency-tools` module
that provides programmatic access to the `dependencyManagement` section
of the dependencies POM.

Fixed gh-262

spring-boot-tools/spring-boot-dependency-tools/src/test/java/org/springframework/boot/dependency/tools/ManagedDependenciesTests.java

@@ -0,0 +1,99 @@
+/*
+ * Copyright 2012-2014 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.dependency.tools;
+
+import java.util.Iterator;
+
+import org.junit.Before;
+import org.junit.Test;
+
+import static org.hamcrest.Matchers.equalTo;
+import static org.hamcrest.Matchers.notNullValue;
+import static org.hamcrest.Matchers.nullValue;
+import static org.junit.Assert.assertThat;
+
+/**
+ * Tests for {@link ManagedDependencies}.
+ * 
+ * @author Phillip Webb
+ */
+public class ManagedDependenciesTests {
+
+	private ManagedDependencies dependencies;
+
+	@Before
+	public void setup() {
+		this.dependencies = new ManagedDependencies("test-dependencies-pom.xml",
+				"test-effective-pom.xml");
+	}
+
+	@Test
+	public void version() throws Exception {
+		assertThat(this.dependencies.getVersion(), equalTo("1.0.0.BUILD-SNAPSHOT"));
+	}
+
+	@Test
+	public void iterate() throws Exception {
+		Iterator<Dependency> iterator = this.dependencies.iterator();
+		assertThat(iterator.next().toString(), equalTo("org.sample:sample01:1.0.0"));
+		assertThat(iterator.next().toString(), equalTo("org.sample:sample02:1.0.0"));
+		assertThat(iterator.hasNext(), equalTo(false));
+	}
+
+	@Test
+	public void findByArtifactAndGroupId() throws Exception {
+		assertThat(this.dependencies.find("org.sample", "sample02").toString(),
+				equalTo("org.sample:sample02:1.0.0"));
+	}
+
+	@Test
+	public void findByArtifactAndGroupIdMissing() throws Exception {
+		assertThat(this.dependencies.find("org.sample", "missing"), nullValue());
+	}
+
+	@Test
+	public void findByArtifactAndGroupIdOnlyInEffectivePom() throws Exception {
+		assertThat(this.dependencies.find("org.extra", "extra01"), nullValue());
+	}
+
+	@Test
+	public void findByArtifactId() throws Exception {
+		assertThat(this.dependencies.find("sample02").toString(),
+				equalTo("org.sample:sample02:1.0.0"));
+	}
+
+	@Test
+	public void findByArtifactIdMissing() throws Exception {
+		assertThat(this.dependencies.find("missing"), nullValue());
+	}
+
+	@Test
+	public void exludes() throws Exception {
+		Dependency dependency = this.dependencies.find("org.sample", "sample01");
+		assertThat(dependency.getExclusions().toString(),
+				equalTo("[org.exclude:exclude01]"));
+	}
+
+	@Test
+	public void get() throws Exception {
+		ManagedDependencies dependencies = ManagedDependencies.get();
+		assertThat(dependencies.iterator().hasNext(), equalTo(true));
+		assertThat(dependencies.find("org.springframework", "spring-core"),
+				notNullValue());
+	}
+
+}

spring-boot-tools/spring-boot-dependency-tools/src/test/resources/org/springframework/boot/dependency/tools/test-dependencies-pom.xml

@@ -0,0 +1,31 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project>
+	<modelVersion>4.0.0</modelVersion>
+	<version>1.0.0.BUILD-SNAPSHOT</version>
+	<properties>
+		<sample.version>1.0.0</sample.version>
+	</properties>
+	<prerequisites>
+		<maven>3.0.0</maven>
+	</prerequisites>
+	<dependencyManagement>
+		<dependencies>
+			<dependency>
+				<groupId>org.sample</groupId>
+				<artifactId>sample01</artifactId>
+				<version>${sample.version}</version>
+				<exclusions>
+                    <exclusion>
+                        <groupId>org.exclude</groupId>
+                        <artifactId>exclude01</artifactId>
+                    </exclusion>
+				</exclusions>
+			</dependency>
+			<dependency>
+				<groupId>org.sample</groupId>
+				<artifactId>sample02</artifactId>
+				<version>${sample.version}</version>
+			</dependency>
+		</dependencies>
+	</dependencyManagement>
+</project>

spring-boot-tools/spring-boot-dependency-tools/src/test/resources/org/springframework/boot/dependency/tools/test-effective-pom.xml

@@ -0,0 +1,34 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+	<modelVersion>4.0.0</modelVersion>
+	<version>1.0.0.BUILD-SNAPSHOT</version>
+	<properties>
+		<sample.version>1.0.0</sample.version>
+	</properties>
+	<dependencyManagement>
+		<dependencies>
+			<dependency>
+				<groupId>org.sample</groupId>
+				<artifactId>sample01</artifactId>
+				<version>1.0.0</version>
+				<exclusions>
+					<exclusion>
+						<groupId>org.exclude</groupId>
+						<artifactId>exclude01</artifactId>
+					</exclusion>
+				</exclusions>
+			</dependency>
+			<dependency>
+				<groupId>org.sample</groupId>
+				<artifactId>sample02</artifactId>
+				<version>1.0.0</version>
+			</dependency>
+			<dependency>
+				<groupId>org.extra</groupId>
+				<artifactId>extra01</artifactId>
+				<version>2.0.0</version>
+			</dependency>
+		</dependencies>
+	</dependencyManagement>
+</project>