/*
* reserved comment block
* DO NOT REMOVE OR ALTER!
*/
package com.sun.org.apache.bcel.internal.generic;
/* ====================================================================
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/**
* Equality of instructions isn't clearly to be defined. You might
* wish, for example, to compare whether instructions have the same
* meaning. E.g., whether two INVOKEVIRTUALs describe the same
* call.<br>The DEFAULT comparator however, considers two instructions
* to be equal if they have same opcode and point to the same indexes
* (if any) in the constant pool or the same local variable index. Branch
* instructions must have the same target.
*
* @see Instruction
* @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
*/
public interface InstructionComparator {
public static final InstructionComparator DEFAULT =
new InstructionComparator() {
public boolean equals(Instruction i1, Instruction i2) {
if(i1.opcode == i2.opcode) {
if(i1 instanceof Select) {
InstructionHandle[] t1 = ((Select)i1).getTargets();
InstructionHandle[] t2 = ((Select)i2).getTargets();
if(t1.length == t2.length) {
for(int i = 0; i < t1.length; i++) {
if(t1[i] != t2[i]) {
return false;
}
}
return true;
}
} else if(i1 instanceof BranchInstruction) {
return ((BranchInstruction)i1).target ==
((BranchInstruction)i2).target;
} else if(i1 instanceof ConstantPushInstruction) {
return ((ConstantPushInstruction)i1).getValue().
equals(((ConstantPushInstruction)i2).getValue());
} else if(i1 instanceof IndexedInstruction) {
return ((IndexedInstruction)i1).getIndex() ==
((IndexedInstruction)i2).getIndex();
} else if(i1 instanceof NEWARRAY) {
return ((NEWARRAY)i1).getTypecode() == ((NEWARRAY)i2).getTypecode();
} else {
return true;
}
}
return false;
}
};
public boolean equals(Instruction i1, Instruction i2);
}