/******************************************************************************
 * Copyright (c) 2002, 2003 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *    IBM Corporation - initial API and implementation 
 ****************************************************************************/

package org.eclipse.gmf.tests.runtime.common.core.internal.service;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.ObjectInput;
import java.io.ObjectInputStream;
import java.io.ObjectOutput;
import java.io.ObjectOutputStream;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;

import junit.framework.Test;
import junit.framework.TestCase;
import junit.framework.TestSuite;
import junit.textui.TestRunner;

import org.eclipse.gmf.runtime.common.core.service.AbstractProvider;
import org.eclipse.gmf.runtime.common.core.service.ExecutionStrategy;
import org.eclipse.gmf.runtime.common.core.service.IOperation;
import org.eclipse.gmf.runtime.common.core.service.IProvider;
import org.eclipse.gmf.runtime.common.core.service.ProviderPriority;
import org.eclipse.gmf.runtime.common.core.service.Service;

/**
 * @author khussey
 */
public class ExecutionStrategyTest extends TestCase {

    protected static class Provider extends AbstractProvider {

        private final String name;

        protected Provider(String name) {
            super();

            this.name = name;
        }

        protected String getName() {
            return name;
        }

        public boolean provides(IOperation operation) {
            return true;
        }

    }

    protected static class Operation implements IOperation {

        protected Operation() {
            super();
        }

        public Object execute(IProvider provider) {
            return ((Provider) provider).getName();
        }

    }

    protected static class Fixture extends ExecutionStrategy {

    	private static final long serialVersionUID = 1L;

        protected Fixture() {
            super("Fixture", 0); //$NON-NLS-1$
        }

        protected List getValues() {
            return super.getValues();
        }

        public List execute(Service service, IOperation operation) {
            return Collections.EMPTY_LIST;
        }

    }

    private Fixture fixture = null;

    private ServiceTest.Fixture service = null;

    public static void main(String[] args) {
        TestRunner.run(suite());
    }

    public static Test suite() {
        return new TestSuite(ExecutionStrategyTest.class);
    }

    public ExecutionStrategyTest(String name) {
        super(name);
    }

    protected Fixture getFixture() {
        return fixture;
    }

    private void setFixture(Fixture fixture) {
        this.fixture = fixture;
    }

    protected ServiceTest.Fixture getService() {
        return service;
    }

    private void setService(ServiceTest.Fixture service) {
        this.service = service;
    }

    protected void setUp() {
        setFixture(new Fixture());

        setService(new ServiceTest.Fixture());

        getService().addFixtureProvider(
            ProviderPriority.HIGHEST,
            new ServiceTest.Fixture.ProviderDescriptor(
                new Provider("Highest"))); //$NON-NLS-1$
        getService().addFixtureProvider(
            ProviderPriority.HIGHEST,
            new ServiceTest.Fixture.ProviderDescriptor(
                new Provider("tsehgiH"))); //$NON-NLS-1$
        getService().addFixtureProvider(
            ProviderPriority.HIGH,
            new ServiceTest.Fixture.ProviderDescriptor(new Provider("High"))); //$NON-NLS-1$
        getService().addFixtureProvider(
            ProviderPriority.HIGH,
            new ServiceTest.Fixture.ProviderDescriptor(new Provider("hgiH"))); //$NON-NLS-1$
        getService().addFixtureProvider(
            ProviderPriority.MEDIUM,
            new ServiceTest.Fixture.ProviderDescriptor(new Provider("Medium"))); //$NON-NLS-1$
        getService().addFixtureProvider(
            ProviderPriority.MEDIUM,
            new ServiceTest.Fixture.ProviderDescriptor(new Provider("muideM"))); //$NON-NLS-1$
        getService().addFixtureProvider(
            ProviderPriority.LOW,
            new ServiceTest.Fixture.ProviderDescriptor(new Provider("Low"))); //$NON-NLS-1$
        getService().addFixtureProvider(
            ProviderPriority.LOW,
            new ServiceTest.Fixture.ProviderDescriptor(new Provider("woL"))); //$NON-NLS-1$
        getService().addFixtureProvider(
            ProviderPriority.LOWEST,
            new ServiceTest.Fixture.ProviderDescriptor(new Provider("Lowest"))); //$NON-NLS-1$
        getService().addFixtureProvider(
            ProviderPriority.LOWEST,
            new ServiceTest.Fixture.ProviderDescriptor(new Provider("tsewoL"))); //$NON-NLS-1$
    }

    public void test_readResolve() {
        ByteArrayOutputStream stream = new ByteArrayOutputStream();

        ObjectOutput output = null;
        ObjectInput input = null;
        try {
            output = new ObjectOutputStream(stream);
            for (Iterator i = getFixture().getValues().iterator();
                i.hasNext();
                ) {
                output.writeObject(i.next());
            }
            output.flush();

            input =
                new ObjectInputStream(
                    new ByteArrayInputStream(stream.toByteArray()));
            for (Iterator i = getFixture().getValues().iterator();
                i.hasNext();
                ) {
                assertSame(i.next(), input.readObject());
            }
        } catch (Exception e) {
            fail();
        } finally {
            try {
                output.close();
                input.close();
            } catch (Exception e) {
            	// Nothing to do
            }
        }
    }

    public void test_execute_FIRST() {
        List result = Fixture.FIRST.execute(getService(), new Operation());
        assertEquals(1, result.size());
        assertEquals("Highest", result.get(0)); //$NON-NLS-1$
    }

    public void test_execute_LAST() {
        List result = Fixture.LAST.execute(getService(), new Operation());
        assertEquals(1, result.size());
        assertEquals("tsewoL", result.get(0)); //$NON-NLS-1$
    }

    public void test_execute_FORWARD() {
        List result =
		Fixture.FORWARD.execute(getService(), new Operation());
        assertEquals(10, result.size());
        assertEquals("Highest", result.get(0)); //$NON-NLS-1$
        assertEquals("tsehgiH", result.get(1)); //$NON-NLS-1$
        assertEquals("High", result.get(2)); //$NON-NLS-1$
        assertEquals("hgiH", result.get(3)); //$NON-NLS-1$
        assertEquals("Medium", result.get(4)); //$NON-NLS-1$
        assertEquals("muideM", result.get(5)); //$NON-NLS-1$
        assertEquals("Low", result.get(6)); //$NON-NLS-1$
        assertEquals("woL", result.get(7)); //$NON-NLS-1$
        assertEquals("Lowest", result.get(8)); //$NON-NLS-1$
        assertEquals("tsewoL", result.get(9)); //$NON-NLS-1$
    }

    public void test_execute_REVERSE() {
        List result =
		Fixture.REVERSE.execute(getService(), new Operation());
        assertEquals(10, result.size());
        assertEquals("tsewoL", result.get(0)); //$NON-NLS-1$
        assertEquals("Lowest", result.get(1)); //$NON-NLS-1$
        assertEquals("woL", result.get(2)); //$NON-NLS-1$
        assertEquals("Low", result.get(3)); //$NON-NLS-1$
        assertEquals("muideM", result.get(4)); //$NON-NLS-1$
        assertEquals("Medium", result.get(5)); //$NON-NLS-1$
        assertEquals("hgiH", result.get(6)); //$NON-NLS-1$
        assertEquals("High", result.get(7)); //$NON-NLS-1$
        assertEquals("tsehgiH", result.get(8)); //$NON-NLS-1$
        assertEquals("Highest", result.get(9)); //$NON-NLS-1$
    }

}