Port spring-integration-jdbc db schema generation to Gradle

Before (Maven): http://pastie.org/1253428
After (Gradle): http://pastie.org/1253435

This new task:
- may be run independently with `gradle generateSql`
- is tied to the build lifecycle and will execute prior to 'compileJava'
- writes output to build/generated-resources
- is set up for incremental build -- will not run if the above dir exists
- may be selectively cleaned with `gradle cleanGenerateSql`

spring-integration-jdbc/build.gradle

@@ -0,0 +1,46 @@
+/**
+ * Generate schema creation and drop scripts for various databases
+ * supported by the Spring Integration JDBC adapter.
+ *
+ * @author David Syer (original Ant/Maven work)
+ * @author Chris Beams (port to Gradle)
+ */
+task generateSql {
+    group = "Build"
+    description = "Generates schema creation and drop scripts for supported databases."
+
+    repositories { mavenRepo urls: 'http://objectstyle.org/maven2/' }
+    configurations { vpp }
+    dependencies { vpp 'foundrylogic.vpp:vpp:2.2.1' }
+
+    def generatedResourcesDir = new File(buildDir, 'generated-resources')
+
+    outputs.dir generatedResourcesDir
+
+    ant.typedef(resource: 'foundrylogic/vpp/typedef.properties',
+                classpath: configurations.vpp.asPath)
+    ant.taskdef(resource: 'foundrylogic/vpp/taskdef.properties',
+                classpath: configurations.vpp.asPath)
+
+    doLast {
+        ['hsqldb', 'h2', 'db2', 'derby', 'mysql',
+         'oracle10g', 'postgresql', 'sqlserver', 'sybase'].each { dbType ->
+            ant.vppcopy(todir: generatedResourcesDir, overwrite: 'true') {
+                config {
+                    context {
+                        property key: 'includes', value: 'src/main/sql'
+                        property file: "src/main/sql/${dbType}.properties"
+                    }
+                    engine {
+                        property key: 'velocimacro.library', value: "src/main/sql/${dbType}.vpp"
+                    }
+                }
+                fileset dir: 'src/main/sql', includes: 'schema*.sql.vpp'
+                mapper type: 'glob', from: '*.sql.vpp', to: "*-${dbType}.sql"
+            }
+        }
+    }
+}
+
+// tie schema generation to the build lifecycle
+compileJava.dependsOn generateSql