mobile/bind: initialize imported bound packages

Make sure that a bound package's imported and also bound packages
are initialized before referencing methods and constructors in the
imported packages.

Change-Id: If158aac83c245a33695d3b1648d0dfc37a7313ac
Reviewed-on: https://go-review.googlesource.com/20652
Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>

bind/genjava.go

@@ -964,10 +964,17 @@ func (g *javaGen) genJava() error {
 	g.Printf("static {\n")
 	g.Indent()
 	g.Printf("Seq.touch(); // for loading the native library\n")
+	for _, p := range g.pkg.Imports() {
+		if g.validPkg(p) {
+			g.Printf("%s.%s.touch();\n", g.javaPkgName(p), className(p))
+		}
+	}
 	g.Printf("init();\n")
 	g.Outdent()
 	g.Printf("}\n\n")
 	g.Printf("private %s() {} // uninstantiable\n\n", g.className())
+	g.Printf("// touch is called from other bound packages to initialize this package\n")
+	g.Printf("public static void touch() {}\n\n")
 	g.Printf("private static native void init();\n\n")
 
 	for _, s := range g.structs {

bind/java/SeqTest.java

@@ -475,6 +475,11 @@ public class SeqTest extends InstrumentationTestCase {
   }
 
   public void testImportedPkg() {
+    Testpkg.CallImportedI(new Secondpkg.I.Stub() {
+      @Override public long F(long i) {
+        return i;
+      }
+    });
     assertEquals("imported string should match", Secondpkg.HelloString, Secondpkg.Hello());
     Secondpkg.I i = Testpkg.NewImportedI();
     Secondpkg.S s = Testpkg.NewImportedS();

bind/testdata/basictypes.java.golden

@@ -14,6 +14,9 @@ public abstract class Basictypes {
     
     private Basictypes() {} // uninstantiable
     
+    // touch is called from other bound packages to initialize this package
+    public static void touch() {}
+    
     private static native void init();
     
     public static final boolean ABool = true;

bind/testdata/customprefix.java.golden

@@ -14,6 +14,9 @@ public abstract class Customprefix {
     
     private Customprefix() {} // uninstantiable
     
+    // touch is called from other bound packages to initialize this package
+    public static void touch() {}
+    
     private static native void init();
     
     

bind/testdata/interfaces.java.golden

@@ -14,6 +14,9 @@ public abstract class Interfaces {
     
     private Interfaces() {} // uninstantiable
     
+    // touch is called from other bound packages to initialize this package
+    public static void touch() {}
+    
     private static native void init();
     
     public interface Error extends go.Seq.Object {

bind/testdata/issue10788.java.golden

@@ -14,6 +14,9 @@ public abstract class Issue10788 {
     
     private Issue10788() {} // uninstantiable
     
+    // touch is called from other bound packages to initialize this package
+    public static void touch() {}
+    
     private static native void init();
     
     public static final class TestStruct implements go.Seq.Object {

bind/testdata/issue12328.java.golden

@@ -14,6 +14,9 @@ public abstract class Issue12328 {
     
     private Issue12328() {} // uninstantiable
     
+    // touch is called from other bound packages to initialize this package
+    public static void touch() {}
+    
     private static native void init();
     
     public static final class T implements go.Seq.Object {

bind/testdata/issue12403.java.golden

@@ -14,6 +14,9 @@ public abstract class Issue12403 {
     
     private Issue12403() {} // uninstantiable
     
+    // touch is called from other bound packages to initialize this package
+    public static void touch() {}
+    
     private static native void init();
     
     public interface Parsable extends go.Seq.Object {

bind/testdata/structs.java.golden

@@ -14,6 +14,9 @@ public abstract class Structs {
     
     private Structs() {} // uninstantiable
     
+    // touch is called from other bound packages to initialize this package
+    public static void touch() {}
+    
     private static native void init();
     
     public static final class S implements go.Seq.Object {

bind/testdata/try.java.golden

@@ -14,6 +14,9 @@ public abstract class Try {
     
     private Try() {} // uninstantiable
     
+    // touch is called from other bound packages to initialize this package
+    public static void touch() {}
+    
     private static native void init();
     
     

bind/testdata/vars.java.golden

@@ -14,6 +14,9 @@ public abstract class Vars {
     
     private Vars() {} // uninstantiable
     
+    // touch is called from other bound packages to initialize this package
+    public static void touch() {}
+    
     private static native void init();
     
     public static final class S implements go.Seq.Object, I {

bind/testpkg/testpkg.go

@@ -454,6 +454,10 @@ func WithImportedS(s *secondpkg.S) *secondpkg.S {
 	return s
 }
 
+func CallImportedI(i secondpkg.I) {
+	i.F(0)
+}
+
 func NewSimpleS() *simplepkg.S {
 	return nil
 }