Allow GenericDocument accept a String property longer than 20_000.

This limit was removed from the AppSearch Jetpack API meaning that
a client could construct a GenericDocument successfully, but then
have a PutDocuments call fail when converting from
androidx.appsearch.GenericDocument
to android.appsearch.GenericDocument.

Icing still has a total document size limit which is 16 MiB.
The put call will fail if it trying to write such document.


Bug: 192909904
Test: GenericDocumentTest
Change-Id: I86f97acc3a8e0f1c25fadf597aed9f42a2c493eb

apex/appsearch/framework/java/external/android/app/appsearch/GenericDocument.java

@@ -51,9 +51,6 @@ import java.util.Set;
 public class GenericDocument {
     private static final String TAG = "AppSearchGenericDocumen";
 
-    /** The maximum {@link String#length} of a {@link String} field. */
-    private static final int MAX_STRING_LENGTH = 20_000;
-
     /** The maximum number of indexed properties a document can have. */
     private static final int MAX_INDEXED_PROPERTIES = 16;
 
@@ -1286,15 +1283,6 @@ public class GenericDocument {
             for (int i = 0; i < values.length; i++) {
                 if (values[i] == null) {
                     throw new IllegalArgumentException("The String at " + i + " is null.");
-                } else if (values[i].length() > MAX_STRING_LENGTH) {
-                    throw new IllegalArgumentException(
-                            "The String at "
-                                    + i
-                                    + " length is: "
-                                    + values[i].length()
-                                    + ", which exceeds length limit: "
-                                    + MAX_STRING_LENGTH
-                                    + ".");
                 }
             }
             mProperties.putStringArray(name, values);

core/tests/coretests/src/android/app/appsearch/external/app/GenericDocumentTest.java

@@ -62,4 +62,18 @@ public class GenericDocumentTest {
         assertThat(outDoc.getPropertyDocument("propDocument").getPropertyBytesArray("propBytes"))
                 .isEqualTo(new byte[][] {{3, 4}});
     }
+
+    @Test
+    public void testPutLargeDocument_exceedLimit() throws Exception {
+        // Create a String property that has a very large property.
+        char[] chars = new char[10_000_000];
+        String property = new StringBuilder().append(chars).append("the end.").toString();
+
+        GenericDocument doc =
+                new GenericDocument.Builder<>("namespace", "id1", "schema1")
+                        .setPropertyString("propString", property)
+                        .build();
+
+        assertThat(doc.getPropertyString("propString")).isEqualTo(property);
+    }
 }