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/*
 * 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.apache.solr.common.params;

import java.util.Iterator;
import java.util.LinkedHashSet;

/**
 *
 */
public class DefaultSolrParams extends SolrParams {

  protected final SolrParams params;
  protected final SolrParams defaults;

  protected DefaultSolrParams(SolrParams params, SolrParams defaults) {
    assert params != null && defaults != null;
    this.params = params;
    this.defaults = defaults;
  }

  @Override
  public String get(String param) {
    String val = params.get(param);
    return val!=null ? val : defaults.get(param);
  }

  @Override
  public String[] getParams(String param) {
    String[] vals = params.getParams(param);
    return vals!=null ? vals : defaults.getParams(param);
  }

  @Override
  public Iterator getParameterNamesIterator() {
    // We need to compute the set of all param names in advance 
    // So we don't wind up with an iterator that returns the same
    // String more then once (SOLR-6780)
    LinkedHashSet allKeys = new LinkedHashSet<>();
    for (SolrParams p : new SolrParams [] {params, defaults}) {
      Iterator localKeys = p.getParameterNamesIterator();
      while (localKeys.hasNext()) {
        allKeys.add(localKeys.next());
      }
    }
    return allKeys.iterator();
  }

  @Override
  public String toString() {
    return "{params("+params+"),defaults("+defaults+")}";
  }
}