net.sf.staccatocommons.lang.predicate.AbstractPredicate2 Maven / Gradle / Ivy

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/*
 Copyright (c) 2011, The Staccato-Commons Team

 This program is free software; you can redistribute it and/or modify
 it under the terms of the GNU Lesser General Public License as published by
 the Free Software Foundation; version 3 of the License.

 This program is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU Lesser General Public License for more details.
 */
package net.sf.staccatocommons.lang.predicate;

import net.sf.staccatocommons.defs.Evaluable2;
import net.sf.staccatocommons.defs.predicate.Predicate;
import net.sf.staccatocommons.defs.predicate.Predicate2;
import net.sf.staccatocommons.defs.tuple.Tuple2;
import net.sf.staccatocommons.restrictions.check.NonNull;

/**
 * @author flbulgarelli
 */
public abstract class AbstractPredicate2 implements Predicate2 {

  public final Boolean apply(A arg0, B arg1) {
    return eval(arg0, arg1);
  }

  public Predicate apply(final A arg) {
    return new AbstractPredicate() {
      public boolean eval(B argument) {
        return AbstractPredicate2.this.apply(arg, argument);
      }
    };
  }

  public Predicate2 not() {
    final class Not extends AbstractPredicate2 {
      public boolean eval(A arg0, B arg1) {
        return !AbstractPredicate2.this.eval(arg0, arg1);
      }

      @Override
      public Predicate2 not() {
        return AbstractPredicate2.this;
      }
    }
    return new Not();
  }

  public Predicate2 or(@NonNull final Evaluable2 other) {
    final class Or extends AbstractPredicate2 {
      public boolean eval(A arg0, B arg1) {
        return AbstractPredicate2.this.eval(arg0, arg1) || other.eval(arg0, arg1);
      }
    }
    return new Or();
  }

  public Predicate2 and(@NonNull final Evaluable2 other) {
    final class And extends AbstractPredicate2 {
      public boolean eval(A arg0, B arg1) {
        return AbstractPredicate2.this.eval(arg0, arg1) && other.eval(arg0, arg1);
      }
    }
    return new And();
  }

  public Predicate2 nullSafe() {
    return new NullSafePredicate2();
  }
  
  
  public Predicate> uncurry() {
    return new AbstractPredicate>() {
      public boolean eval(Tuple2 argument) {
        return AbstractPredicate2.this.eval(argument.first(), argument.second());
      }
    };
  }

  /**
   * @author flbulgarelli
   */
  protected final class NullSafePredicate2 extends AbstractPredicate2 {
    public boolean eval(A arg0, B arg1) {
      if (arg0 == null)
        return arg1 == null;
      if (arg1 == null)
        return false;
      return AbstractPredicate2.this.eval(arg0, arg1);
    }

    public Predicate2 nullSafe() {
      return this;
    }
  }
}