import org.eclipse.pde.internal.core.ibundle.IBundle;

import org.eclipse.pde.internal.core.ibundle.IBundleModel;

import org.eclipse.pde.internal.core.ibundle.IBundlePluginModelBase;

	/**

	 * Sets a header within the plug-in's underlying manifest header, if it has

	 * one. It the plug-in doesn't have a manifest, this method does nothing.

	 * It's expected that this method will only be called by sub-classes during

	 * execution of the template (i.e. during the sub-class's

	 * <samp>updateModel(...)</samp> method). <p/> For example:

	 * <dl>

	 * <dd><samp>setManifestHeader(Constants.BUNDLE_LOCALIZATION,

	 * &quot;plugin&quot;)</samp></dd>

	 * </dl>

	 * 

	 * @see org.osgi.framework.Constants

	 * 

	 * @param name

	 *            The name of the header to set

	 * @param value

	 *            The value of the header

	 */

	protected void setManifestHeader(String name, String value) {

		IBundle bundle = getBundleFromModel();

		if (bundle != null) {

			bundle.setHeader(name, value);

		}

	}

	/**

	 * Gets a header from within the plug-in's underlying manifest header, if it

	 * has one. If the plug-in doesn't have a manifest, this method returns

	 * <samp>null</samp>. It's expected that this method will only be called by

	 * sub-classes during execution of the template (i.e. during the sub-class's

	 * <samp>updateModel(...)</samp> method).

	 * 

	 * @param name

	 *            The name of the header to fetch

	 * @return The value of the manifest header, if available, otherwise

	 *         <samp>null</samp>

	 */

	protected String getManifestHeader(String name) {

		IBundle bundle = getBundleFromModel();

		String value = null;

		if (bundle != null) {

			value = bundle.getHeader(name);

		}

		return value;

	}

	/**

	 * Determines whether this plug-in has a manifest on which to set/get

	 * headers. This method will return <samp>false</samp> if the plug-in

	 * doesn't have a manifest (e.g. it's a v3.0 plug-in) or if the method is

	 * called before the model has been set on the template.

	 * 

	 * It's expected that this method will only be called by sub-classes during

	 * execution of the template (i.e. during the sub-class's

	 * <samp>updateModel(...)</samp> method).

	 * 

	 * @return <sampl>true</samp> if the plug-in has a manifest, <samp>false</samp>

	 *         otherwise

	 */

	protected boolean hasBundleManifest() {

		IBundle bundle = getBundleFromModel();

		// essentially, do we have a bundle?

		return (bundle != null);

	}

	/**

	 * Try to get hold of the underlying bundle for the model, if applicable.

	 * 

	 * @return The bundle instance, or null if not a bundle or if the model

	 *         isn't available.

	 */

	private IBundle getBundleFromModel() {

		// Do early exit checks

		if (model == null || !(model instanceof IBundlePluginModelBase)) {

			return null;

		}

		IBundlePluginModelBase bundlePModel = (IBundlePluginModelBase) model;

		IBundleModel bundleModel = bundlePModel.getBundleModel();

		IBundle bundle = null;

		if (bundleModel != null) {

			bundle = bundleModel.getBundle();

		}

		return bundle;

	}