/*
 * Copyright 2005 Red Hat, Inc. and/or its affiliates.
 * 
 * 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.
 */

package org.drools.compiler.lang.descr;

public class BindingDescr extends BaseDescr implements ExpressionDescr {
    
    private static final long serialVersionUID = 520l;
    
    private String               variable;
    private String               bindingField;
    private String               expression;
    private boolean              unification;

    public BindingDescr() {
        this( null,
              null );
    }

    public BindingDescr(final String variable,
                        final String expression) {
        this.variable = variable;
        this.expression = expression;
    }

    public BindingDescr(final String variable,
                        final String expression,
                        final boolean isUnification ) {
        this( variable, expression, expression, isUnification );
    }

    public BindingDescr(final String variable,
                        final String bindingField,
                        final String expression,
                        final boolean isUnification ) {
        this.variable = variable;
        this.bindingField = bindingField;
        this.expression = expression;
        this.unification = isUnification;
    }

    public void setVariable(final String variable) {
        this.variable = variable;
    }

    public void setExpression(final String expression) {
        this.expression = expression;
    }

    public void setExpressionAndBindingField(final String expression) {
        this.expression = expression;
        this.bindingField = expression;
    }

    public String getVariable() {
        return this.variable;
    }

    public String getExpression() {
        return this.expression;
    }

    public void setUnification( boolean isUnification ) {
        this.unification = isUnification;
    }
    
    public boolean isUnification() {
        return unification;
    }
    
    public String toString() {
        return this.variable + ( this.unification ? " := " : " : " ) + this.expression;
    }

    public String getBindingField() {
        return bindingField != null ? bindingField : expression;
    }

    public void setBindingField( String bindingField ) {
        this.bindingField = bindingField;
    }
}