package org.drools.process.core.context.variable;



/*

 * Copyright 2005 JBoss Inc

 * 

 * Licensed under the Apache License, Version 2.0 (the "License");

 * you may not use this file except in compliance with the License.

 * You may obtain a copy of the License at

 * 

 *      http://www.apache.org/licenses/LICENSE-2.0

 * 

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */



import java.io.Serializable;



import org.drools.process.core.TypeObject;

import org.drools.process.core.ValueObject;

import org.drools.process.core.datatype.DataType;

import org.drools.process.core.datatype.impl.type.UndefinedDataType;



/**

 * Default implementation of a variable.

 * 

 * @author <a href="mailto:kris_verlaenen@hotmail.com">Kris Verlaenen</a>

 */

public class Variable implements TypeObject, ValueObject, Serializable {



    private static final long serialVersionUID = 400L;



    private String name;

    private DataType type;

    private Object value;



    public Variable() {

        this.type = UndefinedDataType.getInstance();

    }



    public String getName() {

        return this.name;

    }



    public void setName(final String name) {

        this.name = name;

    }



    public DataType getType() {

        return this.type;

    }



    public void setType(final DataType type) {

        if ( type == null ) {

            throw new IllegalArgumentException( "type is null" );

        }

        this.type = type;

    }



    public Object getValue() {

        return this.value;

    }



    public void setValue(final Object value) {

        if ( this.type.verifyDataType( value ) ) {

            this.value = value;

        } else {

            final StringBuffer sb = new StringBuffer();

            sb.append( "Value <" );

            sb.append( value );

            sb.append( "> is not valid for datatype: " );

            sb.append( this.type );

            throw new IllegalArgumentException( sb.toString() );

        }

    }



    public String toString() {

        return this.name;

    }

}