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A packaging of the IntelliJ Community Edition java-analysis-impl library. This is release number 1 of trunk branch 142.

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/*
 * Copyright 2000-2009 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 com.intellij.codeInspection.dataFlow.instructions;

import com.intellij.codeInspection.dataFlow.DataFlowRunner;
import com.intellij.codeInspection.dataFlow.DfaInstructionState;
import com.intellij.codeInspection.dataFlow.DfaMemoryState;
import com.intellij.codeInspection.dataFlow.InstructionVisitor;
import com.intellij.codeInspection.dataFlow.value.DfaValue;

/**
 * @author max
 */
public class SwapInstruction extends Instruction {

  @Override
  public DfaInstructionState[] accept(DataFlowRunner runner, DfaMemoryState stateBefore, InstructionVisitor visitor) {
    final DfaValue a = stateBefore.pop();
    final DfaValue b = stateBefore.pop();
    stateBefore.push(a);
    stateBefore.push(b);
    Instruction nextInstruction = runner.getInstruction(getIndex() + 1);
    return new DfaInstructionState[]{new DfaInstructionState(nextInstruction, stateBefore)};
  }

  public String toString() {
    return "SWAP";
  }
}