8  * this work for additional information regarding copyright ownership.
   9  * The ASF licenses this file to You under the Apache License, Version 2.0
  10  * (the "License"); you may not use this file except in compliance with
  11  * the License.  You may obtain a copy of the License at
  12  *
  13  *      http://www.apache.org/licenses/LICENSE-2.0
  14  *
  15  * Unless required by applicable law or agreed to in writing, software
  16  * distributed under the License is distributed on an "AS IS" BASIS,
  17  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  18  * See the License for the specific language governing permissions and
  19  * limitations under the License.
  20  */
  21 
  22 package com.sun.org.apache.bcel.internal.generic;
  23 
  24 /**
  25  * Equality of instructions isn't clearly to be defined. You might
  26  * wish, for example, to compare whether instructions have the same
  27  * meaning. E.g., whether two INVOKEVIRTUALs describe the same
  28  * call.<br>The DEFAULT comparator however, considers two instructions


  29  * to be equal if they have same opcode and point to the same indexes
  30  * (if any) in the constant pool or the same local variable index. Branch
  31  * instructions must have the same target.

  32  *
  33  * @see Instruction
  34  * @version $Id$
  35  */
  36 public interface InstructionComparator {
  37 
  38     InstructionComparator DEFAULT = new InstructionComparator() {
  39 
  40         @Override
  41         public boolean equals( final Instruction i1, final Instruction i2 ) {
  42             if (i1.getOpcode() == i2.getOpcode()) {
  43                 if (i1 instanceof BranchInstruction) {
  44                  // BIs are never equal to make targeters work correctly (BCEL-195)
  45                     return false;
  46 //                } else if (i1 == i2) { TODO consider adding this shortcut
  47 //                    return true; // this must be AFTER the BI test
  48                 } else if (i1 instanceof ConstantPushInstruction) {
  49                     return ((ConstantPushInstruction) i1).getValue().equals(
  50                             ((ConstantPushInstruction) i2).getValue());
  51                 } else if (i1 instanceof IndexedInstruction) {
  52                     return ((IndexedInstruction) i1).getIndex() == ((IndexedInstruction) i2)
  53                             .getIndex();
  54                 } else if (i1 instanceof NEWARRAY) {
  55                     return ((NEWARRAY) i1).getTypecode() == ((NEWARRAY) i2).getTypecode();
  56                 } else {
  57                     return true;
  58                 }
  59             }
  60             return false;
  61         }
  62     };
  63 
  64 
  65     boolean equals( Instruction i1, Instruction i2 );
  66 }

   8  * this work for additional information regarding copyright ownership.
   9  * The ASF licenses this file to You under the Apache License, Version 2.0
  10  * (the "License"); you may not use this file except in compliance with
  11  * the License.  You may obtain a copy of the License at
  12  *
  13  *      http://www.apache.org/licenses/LICENSE-2.0
  14  *
  15  * Unless required by applicable law or agreed to in writing, software
  16  * distributed under the License is distributed on an "AS IS" BASIS,
  17  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  18  * See the License for the specific language governing permissions and
  19  * limitations under the License.
  20  */
  21 
  22 package com.sun.org.apache.bcel.internal.generic;
  23 
  24 /**
  25  * Equality of instructions isn't clearly to be defined. You might
  26  * wish, for example, to compare whether instructions have the same
  27  * meaning. E.g., whether two INVOKEVIRTUALs describe the same
  28  * call.
  29  * <p>
  30  * The DEFAULT comparator however, considers two instructions
  31  * to be equal if they have same opcode and point to the same indexes
  32  * (if any) in the constant pool or the same local variable index. Branch
  33  * instructions must have the same target.
  34  * </p>
  35  *
  36  * @see Instruction

  37  */
  38 public interface InstructionComparator {
  39 
  40     InstructionComparator DEFAULT = (i1, i2) -> {



  41         if (i1.getOpcode() == i2.getOpcode()) {
  42             if (i1 instanceof BranchInstruction) {
  43              // BIs are never equal to make targeters work correctly (BCEL-195)
  44                 return false;
  45 //                } else if (i1 == i2) { TODO consider adding this shortcut
  46 //                    return true; // this must be AFTER the BI test
  47             } else if (i1 instanceof ConstantPushInstruction) {
  48                 return ((ConstantPushInstruction) i1).getValue().equals(
  49                         ((ConstantPushInstruction) i2).getValue());
  50             } else if (i1 instanceof IndexedInstruction) {
  51                 return ((IndexedInstruction) i1).getIndex() == ((IndexedInstruction) i2)
  52                         .getIndex();
  53             } else if (i1 instanceof NEWARRAY) {
  54                 return ((NEWARRAY) i1).getTypecode() == ((NEWARRAY) i2).getTypecode();
  55             } else {
  56                 return true;
  57             }
  58         }
  59         return false;

  60     };
  61 
  62 
  63     boolean equals( Instruction i1, Instruction i2 );
  64 }