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      1 /*
      2  * Copyright (C) 2008 The Guava Authors
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  * http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.google.common.collect.testing;
     18 
     19 /**
     20  * Minimal GWT emulation of {@code com.google.common.collect.testing.Platform}.
     21  *
     22  * <p><strong>This .java file should never be consumed by javac.</strong>
     23  *
     24  * @author Hayward Chan
     25  */
     26 final class Platform {
     27 
     28   static boolean checkIsInstance(Class<?> clazz, Object obj) {
     29     /*
     30      * In GWT, we can't tell whether obj is an instance of clazz because GWT
     31      * doesn't support reflections.  For testing purposes, we give up this
     32      * particular assertion (so that we can keep the rest).
     33      */
     34     return true;
     35   }
     36 
     37   // Class.cast is not supported in GWT.
     38   static void checkCast(Class<?> clazz, Object obj) {
     39   }
     40 
     41   static <T> T[] clone(T[] array) {
     42     return GwtPlatform.clone(array);
     43   }
     44 
     45   // TODO: Consolidate different copies in one single place.
     46   static String format(String template, Object... args) {
     47     // start substituting the arguments into the '%s' placeholders
     48     StringBuilder builder = new StringBuilder(
     49         template.length() + 16 * args.length);
     50     int templateStart = 0;
     51     int i = 0;
     52     while (i < args.length) {
     53       int placeholderStart = template.indexOf("%s", templateStart);
     54       if (placeholderStart == -1) {
     55         break;
     56       }
     57       builder.append(template.substring(templateStart, placeholderStart));
     58       builder.append(args[i++]);
     59       templateStart = placeholderStart + 2;
     60     }
     61     builder.append(template.substring(templateStart));
     62 
     63     // if we run out of placeholders, append the extra args in square braces
     64     if (i < args.length) {
     65       builder.append(" [");
     66       builder.append(args[i++]);
     67       while (i < args.length) {
     68         builder.append(", ");
     69         builder.append(args[i++]);
     70       }
     71       builder.append("]");
     72     }
     73 
     74     return builder.toString();
     75   }
     76 
     77   private Platform() {}
     78 }
     79