rulesettest.java

rule engine drools-2.0-beta-18

package org.drools.rule;

import org.drools.DroolsTestCase;
import org.drools.spi.MockObjectType;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.ObjectInput;
import java.io.ObjectInputStream;
import java.io.ObjectOutput;
import java.io.ObjectOutputStream;

public class RuleSetTest extends DroolsTestCase
{
    private RuleSet ruleSet;

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

    public void setUp()
    {
        this.ruleSet = new RuleSet( "rule_set" );
    }

    public void tearDown()
    {
        this.ruleSet = null;
    }

    public void testBasics()
    {
        assertEquals( "rule_set", this.ruleSet.getName( ) );
    }

    public void testDocumentation()
    {
        assertNull( this.ruleSet.getDocumentation( ) );

        this.ruleSet.setDocumentation( "the cheesiest!" );

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

    /**
     * A RuleSet MUST accept any Rule that does not have a conflicting name.
     */
    public void testAddRule() throws Exception
    {
        InstrumentedRule rule;

        rule = new InstrumentedRule( "cheese" );
        rule.isValid( true );
        this.ruleSet.addRule( rule );
        assertEquals( 0, rule.getLoadOrder( ) );

        rule = new InstrumentedRule( "meat" );
        rule.isValid( true );
        this.ruleSet.addRule( rule );
        assertEquals( 1, rule.getLoadOrder( ) );

        rule = new InstrumentedRule( "vegetables" );
        rule.isValid( true );
        this.ruleSet.addRule( rule );
        assertEquals( 2, rule.getLoadOrder( ) );
    }

    public void testGetRule() throws Exception
    {
        assertNull( this.ruleSet.getRule( "cheese" ) );

        InstrumentedRule rule = new InstrumentedRule( "cheese" );

        rule.isValid( true );

        this.ruleSet.addRule( rule );

        assertSame( rule, this.ruleSet.getRule( "cheese" ) );

        assertNull( this.ruleSet.getRule( "betty" ) );
    }

    /**
     * A RuleSet MUST throw a DuplicateRuleNameException if an attempt to add a
     * Rule whose name conflicts with an already added Rule.
     */
    public void testAddRuleDuplicate() throws Exception
    {
        InstrumentedRule rule1 = new InstrumentedRule( "cheese" );
        InstrumentedRule rule2 = new InstrumentedRule( "cheese" );

        rule1.isValid( true );
        rule2.isValid( true );

        this.ruleSet.addRule( rule1 );

        try
        {
            this.ruleSet.addRule( rule2 );

            fail( "Should have thrown DuplicateRuleNameException" );
        }
        catch ( DuplicateRuleNameException e )
        {
            assertSame( this.ruleSet, e.getRuleSet( ) );

            assertSame( rule1, e.getOriginalRule( ) );

            assertSame( rule2, e.getConflictingRule( ) );
        }
    }

    public void testSerializeRuleSet() throws Exception
    {
        Rule rule1 = new Rule( "test-rule 1" );

        rule1.addParameterDeclaration( "paramVar", new MockObjectType( true ) );

        //add consequence
        rule1.setConsequence( new org.drools.spi.InstrumentedConsequence( ) );

        //add conditions
        rule1.addCondition( new org.drools.spi.InstrumentedCondition( ) );
        rule1.addCondition( new org.drools.spi.InstrumentedCondition( ) );

        rule1.setSalience( 42 );
        rule1.setLoadOrder( 22 );

        Rule rule2 = new Rule( "test-rule 2" );

        rule2.addParameterDeclaration( "paramVar", new MockObjectType( true ) );

        //add consequence
        rule2.setConsequence( new org.drools.spi.InstrumentedConsequence( ) );

        //add conditions
        rule2.addCondition( new org.drools.spi.InstrumentedCondition( ) );
        rule2.addCondition( new org.drools.spi.InstrumentedCondition( ) );
        rule2.setSalience( 12 );
        rule2.setLoadOrder( 2 );

        RuleSet ruleSet = new RuleSet( "rule_set" );
        ruleSet.addRule( rule1 );
        ruleSet.addRule( rule2 );

        // Serialize to a byte array
        ByteArrayOutputStream bos = new ByteArrayOutputStream( );
        ObjectOutput out = new ObjectOutputStream( bos );
        out.writeObject( ruleSet );
        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 ) );
        ruleSet = ( RuleSet ) in.readObject( );
        in.close( );

        assertLength( 2, ruleSet.getRules( ) );
    }
}