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Java Simplified. Extensions and Useful Constructs for the Java Platform. Codeprimate Elements (a.k.a. cp-elements) is a Java library and micro-framework used to simplify the development of software applications written in Java. Elements packages several APIs into one library in order to address various application concerns and aspects of software design and development collectively and conveniently. Elements is a highly simple, yet robust and proven library built on solid OO principles, software design patterns and best practices to effectively solve common and reoccurring problems in software development.

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/*
 * Copyright 2016 Author or Authors.
 *
 * 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 org.cp.elements.util.search;

import org.cp.elements.lang.Filter;

/**
 * The Matcher interface defines a contract for objects that match other objects based on criteria defined
 * by the Matcher.
 *
 * @author John J. Blum
 * @see org.cp.elements.lang.Filter
 * @see org.cp.elements.util.search.Searcher
 * @since 1.0.0
 */
@SuppressWarnings("unused")
public interface Matcher extends Filter {

  /**
   * Determines whether the specified object is an exact match to the criteria defined by this Matcher.
   *
   * @param obj the Object being evaluated as a possible match to the criteria of this Matcher.
   * @return a boolean value indicating whether the specified object is an exact match to the criteria
   * defined by this Matcher.
   * @see #match(Object)
   */
  boolean isMatch(T obj);

  /**
   * Determines the value of the specified object relative to the criteria defined by this Matcher.
   *
   * @param obj the Object being evaluated as a possible match to the criteria of this Matcher.
   * @return an integer indicating the object's relative value to the criteria of this Matcher.  Returns zero for an
   * exact match, a negative number if the object is undervalued, and a positive number if the object exceeds the value
   * of the criteria.
   * @see #isMatch(Object)
   */
  int match(T obj);

}