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      1 /*
      2  * Copyright 2012, Google Inc.
      3  * All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions are
      7  * met:
      8  *
      9  *     * Redistributions of source code must retain the above copyright
     10  * notice, this list of conditions and the following disclaimer.
     11  *     * Redistributions in binary form must reproduce the above
     12  * copyright notice, this list of conditions and the following disclaimer
     13  * in the documentation and/or other materials provided with the
     14  * distribution.
     15  *     * Neither the name of Google Inc. nor the names of its
     16  * contributors may be used to endorse or promote products derived from
     17  * this software without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     20  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     21  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     22  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     23  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     24  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     25  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     26  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     27  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     28  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     29  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 package org.jf.dexlib2.builder;
     33 
     34 import org.jf.dexlib2.Format;
     35 import org.jf.dexlib2.Opcode;
     36 import org.jf.dexlib2.iface.instruction.Instruction;
     37 import org.jf.dexlib2.util.Preconditions;
     38 
     39 import javax.annotation.Nonnull;
     40 import javax.annotation.Nullable;
     41 
     42 public abstract class BuilderInstruction implements Instruction {
     43     @Nonnull protected final Opcode opcode;
     44 
     45     @Nullable MethodLocation location;
     46 
     47     protected BuilderInstruction(@Nonnull Opcode opcode) {
     48         Preconditions.checkFormat(opcode, getFormat());
     49         this.opcode = opcode;
     50     }
     51 
     52     @Nonnull public Opcode getOpcode() {
     53         return opcode;
     54     }
     55 
     56     public abstract Format getFormat();
     57 
     58     public int getCodeUnits() {
     59         return getFormat().size / 2;
     60     }
     61 
     62     @Nonnull
     63     public MethodLocation getLocation() {
     64         if (location == null) {
     65             throw new IllegalStateException("Cannot get the location of an instruction that hasn't been added to a " +
     66                     "method.");
     67         }
     68         return location;
     69     }
     70 }
     71