/*
* Copyright 2003-2011 JetBrains s.r.o.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package jetbrains.mps.lang.dataFlow.framework;
import jetbrains.mps.lang.dataFlow.framework.instructions.Instruction;
import java.util.List;
public class ProgramState {
private Instruction myInstruction;
private boolean myReturnMode;
public ProgramState(Instruction instruction, boolean returnMode) {
myInstruction = instruction;
myReturnMode = returnMode;
}
public Instruction getInstruction() {
return myInstruction;
}
public boolean isReturnMode() {
return myReturnMode;
}
public boolean isStart() {
return !isReturnMode() && myInstruction.isStart();
}
public List<ProgramState> succ() {
return myInstruction.succ(this);
}
public List<ProgramState> pred() {
return myInstruction.pred(this);
}
public int getIndex() {
if (myReturnMode) {
return myInstruction.getIndex() << 1;
} else {
return (myInstruction.getIndex() << 1) + 1;
}
}
public String toString() {
return "(state " + myInstruction + ", " + myReturnMode + ")";
}
public boolean equals(Object obj) {
if (!(obj instanceof ProgramState)) {
return false;
}
ProgramState s = (ProgramState) obj;
return s.getIndex() == getIndex();
}
public int hashCode() {
return getIndex();
}
}