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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.common.basetype;

import org.checkerframework.framework.flow.CFAnalysis;
import org.checkerframework.framework.flow.CFStore;
import org.checkerframework.framework.flow.CFTransfer;
import org.checkerframework.framework.flow.CFValue;
import org.checkerframework.framework.type.GenericAnnotatedTypeFactory;

/**
 * A factory that extends {@link GenericAnnotatedTypeFactory} to use the default flow-sensitive
 * analysis as provided by {@link CFAnalysis}.
 */
public class BaseAnnotatedTypeFactory
    extends GenericAnnotatedTypeFactory {

  public BaseAnnotatedTypeFactory(BaseTypeChecker checker, boolean useFlow) {
    super(checker, useFlow);

    // Every subclass must call postInit!
    if (this.getClass() == BaseAnnotatedTypeFactory.class) {
      this.postInit();
    }
  }

  public BaseAnnotatedTypeFactory(BaseTypeChecker checker) {
    this(checker, flowByDefault);
  }

  @Override
  protected CFAnalysis createFlowAnalysis() {
    return new CFAnalysis(checker, this);
  }
}