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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.dexgen.rop;
     18 
     19 /**
     20  * Interface for lists of attributes.
     21  */
     22 public interface AttributeList {
     23     /**
     24      * Get whether this instance is mutable. Note that the
     25      * {@code AttributeList} interface itself doesn't provide any means
     26      * of mutation, but that doesn't mean that there isn't a non-interface
     27      * way of mutating an instance.
     28      *
     29      * @return {@code true} iff this instance is somehow mutable
     30      */
     31     public boolean isMutable();
     32 
     33     /**
     34      * Get the number of attributes in the list.
     35      *
     36      * @return the size
     37      */
     38     public int size();
     39 
     40     /**
     41      * Get the {@code n}th attribute.
     42      *
     43      * @param n {@code n >= 0, n < size();} which attribute
     44      * @return {@code non-null;} the attribute in question
     45      */
     46     public Attribute get(int n);
     47 
     48     /**
     49      * Get the total length of this list in bytes, when part of a
     50      * class file. The returned value includes the two bytes for the
     51      * {@code attributes_count} length indicator.
     52      *
     53      * @return {@code >= 2;} the total length, in bytes
     54      */
     55     public int byteLength();
     56 
     57     /**
     58      * Get the first attribute in the list with the given name, if any.
     59      *
     60      * @param name {@code non-null;} attribute name
     61      * @return {@code null-ok;} first attribute in the list with the given name,
     62      * or {@code null} if there is none
     63      */
     64     public Attribute findFirst(String name);
     65 
     66     /**
     67      * Get the next attribute in the list after the given one, with the same
     68      * name, if any.
     69      *
     70      * @param attrib {@code non-null;} attribute to start looking after
     71      * @return {@code null-ok;} next attribute after {@code attrib} with the
     72      * same name as {@code attrib}
     73      */
     74     public Attribute findNext(Attribute attrib);
     75 }
     76