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/*
 * (c) Copyright IBM Corp. 2000, 2001.
 * All Rights Reserved.
 */
package org.eclipse.search.ui;

/**
 * Computes a score that is used by the search dialog
 * to find the best fitting page for a selection when opened.
 * The score has no upper limit but must be at least
 * <code>LOWEST</code>. Higher values means the page is better
 * suited for the given selection input.
 * <p>
 * For example, a Java-specific search page score computer could test
 * if the page is a Java search page and returns high scores
 * for Java elements as selection input.
 * </p>
 */
public interface ISearchPageScoreComputer {

	/**
	 * Invalid score value indicating a score is unknown or undecided.
	 */
	public static final int UNKNOWN= -1;

	/**
	 * Lowest possible valid score.
	 */
	public static final int LOWEST= 0;

	/**
	 * Computes and returns a score indicating how good the page with the given
	 * id can handle the given input element.
	 * The search page id appears as the <code>id</code> attribute of the
	 * <code>&lt;page&gt;</code> element contributed to the
	 * search pages extension point (<code>"org.eclipse.search.searchPages"</code>).
	 *
	 * @param	pageId	the string id of the page for which the score is computed
	 * @param	input		the object based on which the page should open
	 * @return	a score higher or equal to <code>LOWEST</code>, or
	 *		<code>UNKNOWN</code> if this computer cannot decide
	 */
	public int computeScore(String pageId, Object input);
}