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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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package com.sun.javatest;

import com.sun.javatest.util.I18NResourceBundle;

/**
 * A filter interface for TestDescriptions.
 * <p>
 * Implementations of this class <b>should</b> implement the {@code equals()}
 * and {@code hashCode()} as per the spec in java.lang.Object.  This is used
 * by the harness for file equality purposes which looking for changes and
 * optimizations to perform.
 *
 * @see TestDescription
 */
public abstract class TestFilter {
    /**
     * Get the name of this filter, as might be used to choose of of a set
     * of filters.  This string should be localized.
     *
     * @return the name of this filter
     */
    public abstract String getName();

    /**
     * Get a description of this filter, as might be used to give more details
     * about this filter than provided by {@link #getName}.  This string should
     * be localized.
     *
     * @return a description of this filter
     */
    public abstract String getDescription();

    /**
     * Get the reason why this filter would reject a test, as might be used
     * in reports.  This string should be localized.
     *
     * @return a rejection reason for this filter
     */
    public abstract String getReason();

    /**
     * Determines whether a TestDescription should be accepted or rejected
     * by this filter.
     *
     * @param td the TestDescription to check
     * @return true if td should be included in collection; false otherwise.
     * @throws TestFilter.Fault if an error occurs while trying to determine if this test
     *                          should be accepted or not.
     */
    public abstract boolean accepts(TestDescription td) throws Fault;

    public boolean accepts(TestResult tr) throws Fault, TestResult.Fault {
        return accepts(tr.getDescription());
    }

    /**
     * Determines whether a TestDescription should be accepted or rejected
     * by this filter; if rejected, it is reported to the provided observer.
     *
     * @param td The TestDescription to check.
     * @param o  An observer, which will be notified if the test is
     *           rejected by this filter.
     * @return true if td should be included in collection; false otherwise.
     * @throws TestFilter.Fault if an error occurs while trying to determine if this test
     *                          should be accepted or not.
     */
    public boolean accepts(TestDescription td, Observer o) throws Fault {
        if (accepts(td)) {
            return true;
        } else {
            o.rejected(td, this);
            return false;
        }
    }

    public boolean accepts(TestResult tr, Observer o) throws Fault, TestResult.Fault {
        return accepts(tr.getDescription(), o);
    }

    /**
     * An interface for notification about why a test has been filtered out.
     */
    public interface Observer {
        /**
         * Notification method called when a test has been rejected.
         *
         * @param d        The test that has been rejected.
         * @param rejector The filter rejecting the test.
         */
        void rejected(TestDescription d, TestFilter rejector);
    }

    /**
     * This exception is to report problems that occur while filtering tests.
     */
    public static class Fault extends Exception {
        /**
         * Create a Fault.
         *
         * @param i18n A resource bundle in which to find the detail message.
         * @param s    The key for the detail message.
         */
        public Fault(I18NResourceBundle i18n, String s) {
            super(i18n.getString(s));
        }

        /**
         * Create a Fault.
         *
         * @param i18n A resource bundle in which to find the detail message.
         * @param s    The key for the detail message.
         * @param o    An argument to be formatted with the detail message by
         *             {@link java.text.MessageFormat#format}
         */
        public Fault(I18NResourceBundle i18n, String s, Object o) {
            super(i18n.getString(s, o));
        }

        /**
         * Create a Fault.
         *
         * @param i18n A resource bundle in which to find the detail message.
         * @param s    The key for the detail message.
         * @param o    An array of arguments to be formatted with the detail message by
         *             {@link java.text.MessageFormat#format}
         */
        public Fault(I18NResourceBundle i18n, String s, Object... o) {
            super(i18n.getString(s, o));
        }
    }
}
