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      1 /*
      2  * Copyright (C) 2011 The Android Open Source Project
      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.android.dx.io.instructions;
     18 
     19 import java.io.EOFException;
     20 
     21 /**
     22  * Implementation of {@code CodeInput} that reads from a {@code short[]}.
     23  */
     24 public final class ShortArrayCodeInput extends BaseCodeCursor
     25         implements CodeInput {
     26     /** source array to read from */
     27     private final short[] array;
     28 
     29     /**
     30      * Constructs an instance.
     31      */
     32     public ShortArrayCodeInput(short[] array) {
     33         if (array == null) {
     34             throw new NullPointerException("array == null");
     35         }
     36 
     37         this.array = array;
     38     }
     39 
     40     /** @inheritDoc */
     41     public boolean hasMore() {
     42         return cursor() < array.length;
     43     }
     44 
     45     /** @inheritDoc */
     46     public int read() throws EOFException {
     47         try {
     48             int value = array[cursor()];
     49             advance(1);
     50             return value & 0xffff;
     51         } catch (ArrayIndexOutOfBoundsException ex) {
     52             throw new EOFException();
     53         }
     54     }
     55 
     56     /** @inheritDoc */
     57     public int readInt() throws EOFException {
     58         int short0 = read();
     59         int short1 = read();
     60 
     61         return short0 | (short1 << 16);
     62     }
     63 
     64     /** @inheritDoc */
     65     public long readLong() throws EOFException {
     66         long short0 = read();
     67         long short1 = read();
     68         long short2 = read();
     69         long short3 = read();
     70 
     71         return short0 | (short1 << 16) | (short2 << 32) | (short3 << 48);
     72     }
     73 }
     74