ruletest.java

rule engine drools-2.0-beta-18

package org.drools.rule;

import org.drools.DroolsTestCase;
import org.drools.WorkingMemory;
import org.drools.spi.Consequence;
import org.drools.spi.Duration;
import org.drools.spi.MockObjectType;
import org.drools.spi.Tuple;

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.List;

public class RuleTest extends DroolsTestCase
{
    public void testConstruct()
    {
        Rule rule = new Rule( "test-rule" );

        assertTrue( !rule.isValid( ) );

        try
        {
            rule.checkValidity( );

            fail( "Should have thrown InvalidRuleException" );
        }
        catch ( InvalidRuleException e )
        {
            // expected and correct
        }

        assertLength( 0, rule.getParameterDeclarations( ) );

        assertLength( 0, rule.getConditions( ) );

        assertNull( rule.getConsequence( ) );
    }

    public void testParameterDeclarations() throws Exception
    {
        Rule rule = new Rule( "test-rule" );

        Declaration paramDecl = rule.addParameterDeclaration( "paramVar", new MockObjectType( true ) );

        List paramDecls = rule.getParameterDeclarations( );

        assertLength( 1, paramDecls );

        assertContains( paramDecl, paramDecls );

        assertSame( paramDecl, rule.getParameterDeclaration( "paramVar" ) );

        assertNull( rule.getParameterDeclaration( "betty" ) );
    }

    public void testLocalDeclarations() throws Exception
    {
        Rule rule = new Rule( "test-rule" );

        Declaration paramDecl = rule.addParameterDeclaration( "paramVar", new MockObjectType( true ) );

        List paramDecls = rule.getParameterDeclarations( );
        assertLength( 1, paramDecls );

        assertContains( paramDecl, paramDecls );

        assertNull( rule.getParameterDeclaration( "betty" ) );
    }

    public void testDocumentation() throws Exception
    {
        Rule rule = new Rule( "test-rule" );

        assertNull( rule.getDocumentation( ) );

        rule.setDocumentation( "the cheesiest!" );

        assertEquals( "the cheesiest!", rule.getDocumentation( ) );
    }

    public void testSalience() throws Exception
    {
        Rule rule = new Rule( "test-rule" );

        assertEquals( 0, rule.getSalience( ) );

        rule.setSalience( 42 );

        assertEquals( 42, rule.getSalience( ) );
    }

    public void testLoadOrder() throws Exception
    {
        Rule rule = new Rule( "test-rule" );

        assertEquals( 0, rule.getLoadOrder( ) );

        rule.setLoadOrder( 42 );

        assertEquals( 42, rule.getLoadOrder( ) );
    }

    public void testDeclarationOrder() throws Exception
    {
        Rule rule = new Rule( "test-rule" );

        assertEquals( 0, rule.addParameterDeclaration( "paramVar0", new MockObjectType( true ) ).getIndex( ) );
        assertEquals( 1, rule.addParameterDeclaration( "paramVar1", new MockObjectType( true ) ).getIndex( ) );
    }

    public void testDuration_SimpleLong() throws Exception
    {
        Rule rule = new Rule( "test-rule" );

        rule.setDuration( 42L );

        Duration dur = rule.getDuration( );

        assertNotNull( dur );

        assertTrue( dur instanceof FixedDuration );

        assertEquals( 42L, rule.getDuration( ).getDuration( null ) );
    }

    public void testDuration_WithObject() throws Exception
    {
        Duration dur = new FixedDuration( 42 );

        Rule rule = new Rule( "test-rule" );

        rule.setDuration( dur );

        assertSame( dur, rule.getDuration( ) );
    }

    public void testConsequence() throws Exception
    {
        Rule rule = new Rule( "test-rule" );

        assertNull( rule.getConsequence( ) );

        Consequence consequence = new Consequence( )
        {
            public void invoke(Tuple tuple, WorkingMemory workingMemory)
            {
                // nothing;
            }
        };

        rule.setConsequence( consequence );

        assertSame( consequence, rule.getConsequence( ) );
    }

    public void testSerializeRuleSet() throws Exception
    {

        Rule rule = new Rule( "test-rule" );

        rule.addParameterDeclaration( "paramVar", new MockObjectType( true ) );

        //add consequence
        rule.setConsequence( new org.drools.spi.InstrumentedConsequence( ) );

        //add conditions
        rule.addCondition( new org.drools.spi.InstrumentedCondition( ) );
        rule.addCondition( new org.drools.spi.InstrumentedCondition( ) );

        rule.setSalience( 42 );
        rule.setLoadOrder( 22 );

        // Serialize to a byte array
        ByteArrayOutputStream bos = new ByteArrayOutputStream( );
        ObjectOutput out = new ObjectOutputStream( bos );
        out.writeObject( rule );
        out.close( );

        // Get the bytes of the serialized object
        byte[] bytes = bos.toByteArray( );

        // Deserialize from a byte array
        ObjectInput in = new ObjectInputStream(
                                                new ByteArrayInputStream( bytes ) );
        rule = ( Rule ) in.readObject( );
        in.close( );

        assertEquals( 42, rule.getSalience( ) );
        assertEquals( 22, rule.getLoadOrder( ) );
        assertLength( 1, rule.getParameterDeclarations( ) );
        assertLength( 2, rule.getConditions( ) );
    }
}