content: /*
   * 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.ambari.server.collections.functors;
  
  import java.util.ArrayList;
  import java.util.Arrays;
  import java.util.Collection;
  import java.util.Collections;
  import java.util.Iterator;
  import java.util.Map;
  import java.util.Set;
  
  import org.apache.ambari.server.collections.Predicate;
  
  /**
   * {@link ContainsPredicate} is a predicate implementation testing whether a string value exists
   * within some set of strings.
   * <p>
   * It it expected that the data supplied to the {@link #evaluate(Object)} method is as {@link Set}
   * of {@link String}s retrieved from a context (a {@link Map} of keys to values, where each value
   * can be an explicit value or a {@link Map} of values creating a tree structure.
   */
  public class ContainsPredicate extends OperationPredicate {
  
    /**
     * The name of this {@link Predicate} implementation
     */
    public static final String NAME = "contains";
  
    /**
     * The value to test for
     */
    private final String value;
  
    /**
     * Creates a new {@link ContainsPredicate} using the given {@link Map} of data.
     * <p>
     * It is expected that the map contains a single {@link java.util.Map.Entry} where the key name
     * is "contains" and the value is a {@link Collection} of 2 {@link String}s. The first value
     * should be the key to use when retrieving data from the context, which should resolve to a
     * {@link Set} of {@link String}s (or null). The second value should be the value to check for
     * existing in the relevant set.
     *
     * @return a new {@link ContainsPredicate}
     */
    public static ContainsPredicate fromMap(Map<String, Object> map) {
  
      Object data = (map == null) ? null : map.get(NAME);
  
      if (data == null) {
        throw new IllegalArgumentException("Missing data for '" + NAME + "' operation");
      } else if (data instanceof Collection) {
        Collection<?> collection = (Collection) data;
        if (collection.size() == 2) {
          Iterator<?> iterator = collection.iterator();
          Object d1 = iterator.next();
          Object d2 = iterator.next();
  
          if ((d1 instanceof String) && (d2 instanceof String)) {
            return new ContainsPredicate(new ContextTransformer((String) d1), (String) d2);
          } else {
            throw new IllegalArgumentException(String.format("Unexpected data types: %s and %s", d1.getClass().getName(), d2.getClass().getName()));
          }
        } else {
          throw new IllegalArgumentException(String.format("Missing data for '" + NAME + "' operation - 2 predicates are needed, %d found", collection.size()));
        }
      } else {
        throw new IllegalArgumentException(String.format("Unexpected data type for '" + NAME + "' operation - %s", data.getClass().getName()));
      }
    }
  
    /**
     * Constructor
     *
     * @param transformer the {@link ContextTransformer} configured with the context key to find
     * @param value       the value to test
     */
    public ContainsPredicate(ContextTransformer transformer, String value) {
      super(NAME, transformer);
      this.value = value;
    }
  
    /**
     * Gets the test value
     *
     * @return a string
     */
    public String getValue() {
      return value;
    }
  
    @Override
    protected boolean evaluateTransformedData(Object data) {
      return (this.value != null) && (data instanceof Set) && ((Set<?>) data).contains(this.value);
    }
  
    @Override
    public Map<String, Object> toMap() {
      return Collections.singletonMap(NAME,
        new ArrayList<>(Arrays.asList(getContextKey(), value)));
    }
  
    @Override
    public int hashCode() {
      return super.hashCode() +
          (37 * ((this.value == null) ? 0 : this.value.hashCode()));
    }
  
    @Override
    public boolean equals(Object obj) {
      if (obj == this) {
        return true;
      } else if (obj == null) {
        return false;
      } else if (super.equals(obj) && (obj instanceof ContainsPredicate) && (hashCode() == obj.hashCode())) {
        ContainsPredicate p = (ContainsPredicate) obj;
        return (value == null) ? (p.value == null) : value.equals(p.value);
      } else {
        return false;
      }
    }
  }
  