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  /*
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   * Licensed to the Apache Software Foundation (ASF) under one or more
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   * contributor license agreements.  See the NOTICE file distributed with
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   * this work for additional information regarding copyright ownership.
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   * The ASF licenses this file to You under the Apache License, Version 2.0
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   * (the "License"); you may not use this file except in compliance with
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   * the License.  You may obtain a copy of the License at
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   *
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   *      http://www.apache.org/licenses/LICENSE-2.0
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  *
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  * Unless required by applicable law or agreed to in writing, software
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  * distributed under the License is distributed on an "AS IS" BASIS,
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  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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  * See the License for the specific language governing permissions and
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  * limitations under the License.
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  */
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 package org.apache.wicket.behavior;
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A AbstractHeaderContributor behavior that is specialized on package resources. If you use this class, you have to pre-register the resources you want to contribute. A shortcut for common cases is to call forCss(java.lang.Class,java.lang.String) to contribute a package css file or forJavaScript(java.lang.Class,java.lang.String) to contribute a packaged javascript file. For instance: 
 add(HeaderContributor.forCss(MyPanel.class, "mystyle.css"));

Author(s):
Eelco Hillenius
Matej Knopp
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 {
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 	private static final long serialVersionUID = 1L;
Returns a new instance of HeaderContributor with a header contributor that references a CSS file that lives in a package.

Parameters:
scope The scope of the package resource (typically the class of the caller, or a class that lives in the package where the resource lives).
path The path
Returns:
the new header contributor instance
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 	public static final HeaderContributor forCss(final Class scope, final String path)
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 	{
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 		{
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 			private static final long serialVersionUID = 1L;
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 			public void renderHead(IHeaderResponse response)
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 			{
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 				response.renderCSSReference(new CompressedResourceReference(scope, path));
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 			}
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 		});
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 	}
Returns a new instance of HeaderContributor with a header contributor that references a CSS file that lives in a package.

Parameters:
scope The scope of the package resource (typically the class of the caller, or a class that lives in the package where the resource lives).
path The path
media The media type for this CSS ("print", "screen", etc.)
Returns:
the new header contributor instance
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 	public static final HeaderContributor forCss(final Class scope, final String path,
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 		final String media)
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 	{
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 		{
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 			private static final long serialVersionUID = 1L;
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 			public void renderHead(IHeaderResponse response)
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 			{
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 				response.renderCSSReference(new CompressedResourceReference(scope, path), media);
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 			}
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 		});
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 	}
Returns a new instance of HeaderContributor with a header contributor that references a CSS file that lives in a package.

Parameters:
reference
Returns:
the new header contributor instance
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	public static final HeaderContributor forCss(final ResourceReference reference)
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	{
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		{
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			private static final long serialVersionUID = 1L;
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			public void renderHead(IHeaderResponse response)
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			{
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				response.renderCSSReference(reference);
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			}
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		});
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	}
Returns a new instance of HeaderContributor with a header contributor that references a CSS file that lives in a package.

Parameters:
reference
media The media type for this CSS ("print", "screen", etc.)
Returns:
the new header contributor instance
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	public static final HeaderContributor forCss(final ResourceReference reference,
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		final String media)
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	{
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		{
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			private static final long serialVersionUID = 1L;
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			public void renderHead(IHeaderResponse response)
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			{
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				response.renderCSSReference(reference, media);
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			}
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		});
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	}
Returns a new instance of HeaderContributor with a header contributor referencing a CSS file using one of the following schemes:
  • Starts with http:// or https:// for an external reference.
  • Starts with "/" for an absolute reference that Wicket will not rewrite.
  • Starts with anything else, which Wicket will automatically prepend to make relative to the context root of your web-app.

Parameters:
location The location of the css file.
Returns:
the new header contributor instance
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	public static final HeaderContributor forCss(final String location)
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	{
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		{
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			private static final long serialVersionUID = 1L;
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			public void renderHead(IHeaderResponse response)
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			{
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			}
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		});
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	}
Returns a new instance of HeaderContributor with a header contributor referencing a CSS file using one of the following schemes:
  • Starts with http:// or https:// for an external reference.
  • Starts with "/" for an absolute reference that Wicket will not rewrite.
  • Starts with anything else, which Wicket will automatically prepend to make relative to the context root of your web-app.

Parameters:
location The location of the css.
media The media type for this CSS ("print", "screen", etc.)
Returns:
the new header contributor instance
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	public static final HeaderContributor forCss(final String location, final String media)
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	{
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		{
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			private static final long serialVersionUID = 1L;
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			public void renderHead(IHeaderResponse response)
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			{
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				response.renderCSSReference(returnRelativePath(location), media);
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			}
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		});
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	}
Returns a new instance of HeaderContributor with a header contributor that references a java script file that lives in a package.

Parameters:
scope The scope of the package resource (typically the class of the caller, or a class that lives in the package where the resource lives).
path The path
Returns:
the new header contributor instance
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	public static final HeaderContributor forJavaScript(final Class scope, final String path)
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	{
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		{
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			private static final long serialVersionUID = 1L;
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			public void renderHead(IHeaderResponse response)
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			{
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			}
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		});
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	}
Returns a new instance of HeaderContributor with a header contributor that references a java script file that lives in a package.

Parameters:
reference
Returns:
the new header contributor instance
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	public static final HeaderContributor forJavaScript(final ResourceReference reference)
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	{
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		{
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			private static final long serialVersionUID = 1L;
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			public void renderHead(IHeaderResponse response)
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			{
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				response.renderJavascriptReference(reference);
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			}
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		});
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	}
Returns a new instance of HeaderContributor with a header contributor referencing a java script file using one of the following schemes:
  • Starts with http:// or https:// for an external reference.
  • Starts with "/" for an absolute reference that Wicket will not rewrite.
  • Starts with anything else, which Wicket will automatically prepend to make relative to the context root of your web-app.

Parameters:
location The location of the java script file.
Returns:
the new header contributor instance
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	public static final HeaderContributor forJavaScript(final String location)
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	{
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		{
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			private static final long serialVersionUID = 1L;
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			public void renderHead(IHeaderResponse response)
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			{
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			}
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		});
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	}
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	// Adds ../ links to make the location relative to the root of the webapp,
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	// provided it's not a fully-qualified URL.
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	private static final String returnRelativePath(String location)
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	{
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		// WICKET-59 allow external URLs, WICKET-612 allow absolute URLs.
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		if (location.startsWith("http://") || location.startsWith("https://") ||
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			location.startsWith("/"))
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		{
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			return location;
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		}
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		else
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		{
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			return RequestCycle.get().getRequest().getRelativePathPrefixToContextRoot() + location;
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		}
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	}
Resource reference to contribute.
Construct.

Parameters:
headerContributor the header contributor
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	public HeaderContributor(IHeaderContributor headerContributor)
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	{
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		if (headerContributor == null)
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		{
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			throw new IllegalArgumentException("header contributor may not be null");
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		}
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		this. = headerContributor;
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	}

See also:
AbstractHeaderContributor.getHeaderContributors()
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	{
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	}
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