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Java example source code file (AbstractMatcher.java)

This example Java source code file (AbstractMatcher.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

abstractmatcher, andmatcher, matcher, ormatcher, override, serializable, string

The AbstractMatcher.java Java example source code

/**
 * Copyright (C) 2006 Google Inc.
 *
 * 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 com.google.inject.matcher;

import java.io.Serializable;

/**
 * Implements {@code and()} and {@code or()}.
 *
 * @author crazybob@google.com (Bob Lee)
 */
public abstract class AbstractMatcher<T> implements Matcher {

  public Matcher<T> and(final Matcher other) {
    return new AndMatcher<T>(this, other);
  }

  public Matcher<T> or(Matcher other) {
    return new OrMatcher<T>(this, other);
  }

  private static class AndMatcher<T> extends AbstractMatcher implements Serializable {
    private final Matcher<? super T> a, b;

    public AndMatcher(Matcher<? super T> a, Matcher b) {
      this.a = a;
      this.b = b;
    }

    public boolean matches(T t) {
      return a.matches(t) && b.matches(t);
    }

    @Override public boolean equals(Object other) {
      return other instanceof AndMatcher
          && ((AndMatcher) other).a.equals(a)
          && ((AndMatcher) other).b.equals(b);
    }

    @Override public int hashCode() {
      return 41 * (a.hashCode() ^ b.hashCode());
    }

    @Override public String toString() {
      return "and(" + a + ", " + b + ")";
    }

    private static final long serialVersionUID = 0;
  }

  private static class OrMatcher<T> extends AbstractMatcher implements Serializable {
    private final Matcher<? super T> a, b;

    public OrMatcher(Matcher<? super T> a, Matcher b) {
      this.a = a;
      this.b = b;
    }

    public boolean matches(T t) {
      return a.matches(t) || b.matches(t);
    }

    @Override public boolean equals(Object other) {
      return other instanceof OrMatcher
          && ((OrMatcher) other).a.equals(a)
          && ((OrMatcher) other).b.equals(b);
    }

    @Override public int hashCode() {
      return 37 * (a.hashCode() ^ b.hashCode());
    }

    @Override public String toString() {
      return "or(" + a + ", " + b + ")";
    }

    private static final long serialVersionUID = 0;
  }
}

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