/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to you 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.eigenbase.rex;

/**
 * A <code>RexPattern</code> represents an expression with holes in it. The
 * {@link #match} method tests whether a given expression matches the pattern.
 */
public interface RexPattern {
  //~ Methods ----------------------------------------------------------------

  /**
   * Calls <code>action</code> for every combination of tokens for which this
   * pattern matches.
   */
  void match(
      RexNode ptree,
      RexAction action);
}

// End RexPattern.java