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## org.springframework.web.servlet.mvc.condition
Class HeadersRequestCondition

    java.lang.Object
      org.springframework.web.servlet.mvc.condition.AbstractRequestCondition<HeadersRequestCondition>
          org.springframework.web.servlet.mvc.condition.HeadersRequestCondition

All Implemented Interfaces:
  RequestCondition<HeadersRequestCondition>

    public final class HeadersRequestCondition

extends AbstractRequestCondition<HeadersRequestCondition>

A logical conjunction (' && ') request condition that matches a request against a set of header expressions with syntax defined in `RequestMapping.headers()`.

Expressions passed to the constructor with header names 'Accept' or 'Content-Type' are ignored. See `ConsumesRequestCondition` and `ProducesRequestCondition` for those.

Since:
  3.1
Author:
  Arjen Poutsma, Rossen Stoyanchev

Constructor Summary
`HeadersRequestCondition(String... headers)` Create a new instance from the given header expressions.

Method Summary
`HeadersRequestCondition` | `combine(HeadersRequestCondition other)` Returns a new instance with the union of the header expressions from "this" and the "other" instance.
`int` | `compareTo(HeadersRequestCondition other, HttpServletRequest request)` Returns: 0 if the two conditions have the same number of header expressions Less than 0 if "this" instance has more header expressions Greater than 0 if the "other" instance has more header expressions
`protected Collection<org.springframework.web.servlet.mvc.condition.HeadersRequestCondition.HeaderExpression>` | `getContent()` Return the discrete items a request condition is composed of.
`Set<NameValueExpression<String>>` | `getExpressions()` Return the contained request header expressions.
`HeadersRequestCondition` | `getMatchingCondition(HttpServletRequest request)` Returns "this" instance if the request matches all expressions; or `null` otherwise.
`protected String` | `getToStringInfix()` The notation to use when printing discrete items of content.

Methods inherited from class org.springframework.web.servlet.mvc.condition.AbstractRequestCondition
`equals, hashCode, toString`

Methods inherited from class java.lang.Object
`clone, finalize, getClass, notify, notifyAll, wait, wait, wait`

Constructor Detail

### HeadersRequestCondition

    public HeadersRequestCondition(String... headers)

  Create a new instance from the given header expressions. Expressions with header names 'Accept' or 'Content-Type' are ignored. See `ConsumesRequestCondition` and `ProducesRequestCondition` for those.

  Parameters:
    `headers` - media type expressions with syntax defined in `RequestMapping.headers()`; if 0, the condition will match to every request.

Method Detail

### getExpressions

    public Set<NameValueExpression<String>> getExpressions()

  Return the contained request header expressions.

### getContent

    protected Collection<org.springframework.web.servlet.mvc.condition.HeadersRequestCondition.HeaderExpression> getContent()

  Description copied from class: `AbstractRequestCondition`
  Return the discrete items a request condition is composed of. For example URL patterns, HTTP request methods, param expressions, etc.

  Specified by:
    `getContent` in class `AbstractRequestCondition<HeadersRequestCondition>`
  Returns:
    a collection of objects, never `null`

### getToStringInfix

    protected String getToStringInfix()

  Description copied from class: `AbstractRequestCondition`
  The notation to use when printing discrete items of content. For example " || " for URL patterns or " && " for param expressions.

  Specified by:
    `getToStringInfix` in class `AbstractRequestCondition<HeadersRequestCondition>`

### combine

    public HeadersRequestCondition combine(HeadersRequestCondition other)

  Returns a new instance with the union of the header expressions from "this" and the "other" instance.

  Parameters:
    `other` - the condition to combine with.

### getMatchingCondition

    public HeadersRequestCondition getMatchingCondition(HttpServletRequest request)

  Returns "this" instance if the request matches all expressions; or `null` otherwise.

  Returns:
    a condition instance in case of a match; or `null` if there is no match.

### compareTo

    public int compareTo(HeadersRequestCondition other,
                         HttpServletRequest request)

  Returns:
  - 0 if the two conditions have the same number of header expressions
  - Less than 0 if "this" instance has more header expressions
  - Greater than 0 if the "other" instance has more header expressions

  It is assumed that both instances have been obtained via `getMatchingCondition(HttpServletRequest)` and each instance contains the matching header expression only or is otherwise empty.

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