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      1 /*
      2  * Copyright (C) 2007 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.cf.code;
     18 
     19 import com.android.dx.util.FixedSizeList;
     20 import com.android.dx.util.Hex;
     21 import com.android.dx.util.LabeledList;
     22 
     23 /**
     24  * List of {@link ByteBlock} instances.
     25  */
     26 public final class ByteBlockList extends LabeledList {
     27 
     28     /**
     29      * Constructs an instance.
     30      *
     31      * @param size {@code >= 0;} the number of elements to be in the list
     32      */
     33     public ByteBlockList(int size) {
     34         super(size);
     35     }
     36 
     37     /**
     38      * Gets the indicated element. It is an error to call this with the
     39      * index for an element which was never set; if you do that, this
     40      * will throw {@code NullPointerException}.
     41      *
     42      * @param n {@code >= 0, < size();} which element
     43      * @return {@code non-null;} the indicated element
     44      */
     45     public ByteBlock get(int n) {
     46         return (ByteBlock) get0(n);
     47     }
     48 
     49     /**
     50      * Gets the block with the given label.
     51      *
     52      * @param label the label to look for
     53      * @return {@code non-null;} the block with the given label
     54      */
     55     public ByteBlock labelToBlock(int label) {
     56         int idx = indexOfLabel(label);
     57 
     58         if (idx < 0) {
     59             throw new IllegalArgumentException("no such label: "
     60                     + Hex.u2(label));
     61         }
     62 
     63         return get(idx);
     64     }
     65 
     66     /**
     67      * Sets the element at the given index.
     68      *
     69      * @param n {@code >= 0, < size();} which element
     70      * @param bb {@code null-ok;} the value to store
     71      */
     72     public void set(int n, ByteBlock bb) {
     73         super.set(n, bb);
     74     }
     75 }
     76