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package org.checkerframework.dataflow.cfg.block;
import java.util.Collections;
import java.util.HashSet;
import java.util.Set;
/**
* Base class of the {@link Block} implementation hierarchy.
*
* @author Stefan Heule
*
*/
public abstract class BlockImpl implements Block {
/** A unique ID for this node. */
protected long id = BlockImpl.uniqueID();
/** The last ID that has already been used. */
protected static long lastId = 0;
/** The type of this basic block. */
protected BlockType type;
/** The set of predecessors. */
protected Set<BlockImpl> predecessors;
/**
* @return A fresh identifier.
*/
private static long uniqueID() {
return lastId++;
}
public BlockImpl() {
predecessors = new HashSet<>();
}
@Override
public long getId() {
return id;
}
@Override
public BlockType getType() {
return type;
}
/**
* @return The list of predecessors of this basic block.
*/
public Set<BlockImpl> getPredecessors() {
return Collections.unmodifiableSet(predecessors);
}
public void addPredecessor(BlockImpl pred) {
predecessors.add(pred);
}
public void removePredecessor(BlockImpl pred) {
predecessors.remove(pred);
}
}
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