org.checkerframework.dataflow.cfg.block.RegularBlockImpl Maven / Gradle / Ivy

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The Checker Framework enhances Java's type system to make it more powerful and useful. This lets software developers detect and prevent errors in their Java programs. The Checker Framework includes compiler plug-ins ("checkers") that find bugs or verify their absence. It also permits you to write your own compiler plug-ins.

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package org.checkerframework.dataflow.cfg.block;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import org.checkerframework.checker.nullness.qual.Nullable;
import org.checkerframework.dataflow.cfg.node.Node;

/** Implementation of a regular basic block. */
public class RegularBlockImpl extends SingleSuccessorBlockImpl implements RegularBlock {

  /** Internal representation of the contents. */
  protected final List contents;

  /**
   * Initialize an empty basic block to be filled with contents and linked to other basic blocks
   * later.
   */
  public RegularBlockImpl() {
    super(BlockType.REGULAR_BLOCK);
    contents = new ArrayList<>();
  }

  /** Add a node to the contents of this basic block. */
  public void addNode(Node t) {
    contents.add(t);
    t.setBlock(this);
  }

  /** Add multiple nodes to the contents of this basic block. */
  public void addNodes(List ts) {
    for (Node t : ts) {
      addNode(t);
    }
  }

  /**
   * {@inheritDoc}
   *
   * This implementation returns an non-empty list.
   */
  @Override
  public List getNodes() {
    return Collections.unmodifiableList(contents);
  }

  @Override
  public @Nullable Node getLastNode() {
    return contents.get(contents.size() - 1);
  }

  @Override
  public @Nullable BlockImpl getRegularSuccessor() {
    return successor;
  }

  @Override
  public String toString() {
    return "RegularBlock(" + contents + ")";
  }

  @Override
  public boolean isEmpty() {
    return contents.isEmpty();
  }
}