/*
 * Copyright 2012 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.workbench.models.datamodel.rule;

import java.util.Arrays;

/**
 * This class is the parent for field setting or assertion actions.
 * <p/>
 * Contains the list of fields and their values to be set.
 */
public abstract class ActionFieldList
        implements
        IAction {

    private ActionFieldValue[] fieldValues = new ActionFieldValue[ 0 ];

    public ActionFieldList() {

    }

    public ActionFieldValue[] getFieldValues() {
        return fieldValues;
    }

    public void setFieldValues( final ActionFieldValue[] actionFieldValues ) {
        this.fieldValues = actionFieldValues;
    }

    public void removeField( final int idx ) {
        //Unfortunately, this is kinda duplicate code with other methods, 
        //but with typed arrays, and GWT, its not really possible to do anything "better" 
        //at this point in time. 
        final ActionFieldValue[] newList = new ActionFieldValue[ this.fieldValues.length - 1 ];
        int newIdx = 0;
        for ( int i = 0; i < this.fieldValues.length; i++ ) {

            if ( i != idx ) {
                newList[ newIdx ] = this.fieldValues[ i ];
                newIdx++;
            }

        }
        this.fieldValues = newList;
    }

    public void addFieldValue( final ActionFieldValue val ) {
        if ( this.fieldValues == null ) {
            this.fieldValues = new ActionFieldValue[ 1 ];
            this.fieldValues[ 0 ] = val;
        } else {
            final ActionFieldValue[] newList = new ActionFieldValue[ this.fieldValues.length + 1 ];
            for ( int i = 0; i < this.fieldValues.length; i++ ) {
                newList[ i ] = this.fieldValues[ i ];
            }
            newList[ this.fieldValues.length ] = val;
            this.fieldValues = newList;
        }
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;

        ActionFieldList that = (ActionFieldList) o;

        if (!Arrays.equals(fieldValues, that.fieldValues)) return false;

        return true;
    }

        @Override
    public int hashCode() {
        return fieldValues != null ? Arrays.hashCode(fieldValues) : 0;
    }
}