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      1 /*
      2  * Copyright (C) 2012 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.io;
     18 
     19 import static com.google.common.base.Preconditions.checkNotNull;
     20 
     21 import com.google.common.collect.ImmutableSet;
     22 
     23 import java.io.ByteArrayInputStream;
     24 import java.io.IOException;
     25 import java.io.InputStream;
     26 import java.util.Random;
     27 
     28 /**
     29  * A byte source for testing that has configurable behavior.
     30  *
     31  * @author Colin Decker
     32  */
     33 public final class TestByteSource extends ByteSource implements TestStreamSupplier {
     34 
     35   private final byte[] bytes;
     36   private final ImmutableSet<TestOption> options;
     37 
     38   private boolean inputStreamOpened;
     39   private boolean inputStreamClosed;
     40 
     41   TestByteSource(byte[] bytes, TestOption... options) {
     42     this.bytes = checkNotNull(bytes);
     43     this.options = ImmutableSet.copyOf(options);
     44   }
     45 
     46   @Override
     47   public boolean wasStreamOpened() {
     48     return inputStreamOpened;
     49   }
     50 
     51   @Override
     52   public boolean wasStreamClosed() {
     53     return inputStreamClosed;
     54   }
     55 
     56   @Override
     57   public InputStream openStream() throws IOException {
     58     inputStreamOpened = true;
     59     return new RandomAmountInputStream(new In(), new Random());
     60   }
     61 
     62   private final class In extends TestInputStream {
     63 
     64     public In() throws IOException {
     65       super(new ByteArrayInputStream(bytes), options);
     66     }
     67 
     68     @Override
     69     public void close() throws IOException {
     70       inputStreamClosed = true;
     71       super.close();
     72     }
     73   }
     74 }
     75