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package org.springframework.cache.interceptor;

import java.io.Serializable;
import java.util.Arrays;

import org.springframework.util.Assert;
import org.springframework.util.StringUtils;

/**
 * @see SimpleKey
 */
public class Key implements Serializable {
  private static final long serialVersionUID = 7077017939597365834L;

  private final Object[] params;
  private final int hashCode;

  public Key(Object... elements) {
    Assert.notNull(elements, "'elements' must not be null");
    if (elements.length == 1 && elements[0] != null && !elements[0].getClass().isArray()) {
      this.params = new Object[] { elements[0] };
    }
    else {
      this.params = new Object[elements.length];
    }
    System.arraycopy(elements, 0, this.params, 0, elements.length);
    this.hashCode = Arrays.deepHashCode(this.params);
  }

  @Override
  public boolean equals(Object obj) {
    return (this == obj || (obj instanceof Key && Arrays.deepEquals(this.params, ((Key) obj).params)));
  }

  @Override
  public final int hashCode() {
    return this.hashCode;
  }

  @Override
  public String toString() {
    return getClass().getSimpleName() + " [" + StringUtils.arrayToCommaDelimitedString(this.params) + "]";
  }
}