Show version requirements for disabled starters

This commit writes the version range information in human readable
format and adds it to the starter list when starters are disabled.

Closes gh-293

initializr-generator/src/main/groovy/io/spring/initializr/metadata/Dependency.groovy

@@ -16,6 +16,7 @@
 
 package io.spring.initializr.metadata
 
+import com.fasterxml.jackson.annotation.JsonIgnore
 import com.fasterxml.jackson.annotation.JsonInclude
 import groovy.transform.AutoClone
 import groovy.transform.AutoCloneStyle
@@ -81,6 +82,9 @@ class Dependency extends MetadataElement {
 
 	String versionRange
 
+	@JsonIgnore
+	String versionRequirement
+
 	String bom
 
 	String repository
@@ -157,7 +161,8 @@ class Dependency extends MetadataElement {
 		}
 		if (versionRange) {
 			try {
-				VersionRange.parse(versionRange)
+				def range = VersionRange.parse(versionRange)
+				versionRequirement = range.toString()
 			} catch (InvalidVersionException ex) {
 				throw new InvalidInitializrMetadataException("Invalid version range '$versionRange' for " +
 						"dependency with id '$id'")
@@ -183,6 +188,7 @@ class Dependency extends MetadataElement {
 				dependency.groupId = mapping.groupId ? mapping.groupId : this.groupId
 				dependency.artifactId = mapping.artifactId ? mapping.artifactId : this.artifactId
 				dependency.version = mapping.version ? mapping.version : this.version
+				dependency.versionRequirement = mapping.range.toString()
 				dependency.mappings = null
 				return dependency
 			}

initializr-generator/src/main/groovy/io/spring/initializr/util/VersionRange.groovy

@@ -38,7 +38,6 @@ import org.springframework.util.Assert
  * @author Stephane Nicoll
  * @since 1.0
  */
-@ToString
 @EqualsAndHashCode
 class VersionRange {
 
@@ -80,6 +79,18 @@ class VersionRange {
 		return true
 	}
 
+	@Override
+	String toString() {
+		StringBuffer sb = new StringBuffer()
+		if (lowerVersion) {
+			sb.append("${lowerInclusive ? '>=' : '>'}${lowerVersion}")
+		}
+		if (higherVersion) {
+		   sb.append(" and ${higherInclusive ? '<=' : '<'}${higherVersion}")
+		}
+		return sb.toString()
+	}
+
 	/**
 	 * Parse the string representation of a {@link VersionRange}. Throws an
 	 * {@link InvalidVersionException} if the range could not be parsed.

initializr-generator/src/test/groovy/io/spring/initializr/metadata/DependencyTests.groovy

@@ -155,6 +155,16 @@ class DependencyTests {
 		dependency.resolve()
 	}
 
+	@Test
+	void resolveVersionRequirement() {
+		def dependency = new Dependency(id: 'web')
+		dependency.mappings << new Dependency.Mapping(
+				versionRange: '[1.1.0.RELEASE, 1.2.0.RELEASE)', version: '0.1.0.RELEASE')
+		dependency.resolve()
+		def resolved = dependency.resolve(Version.parse('1.1.5.RELEASE'))
+		assertEquals ">=1.1.0.RELEASE and <1.2.0.RELEASE", resolved.versionRequirement
+	}
+
 	@Test
 	void resolveMatchingVersionMapping() {
 		def dependency = new Dependency(id: 'web', description: 'A web dependency', version: '0.3.0.RELEASE',