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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.
 *
 * Authors: Stefan Irimescu, Can Berker Cikis
 *
 */

package sparksoniq.jsoniq.runtime.iterator.functions.strings;

import sparksoniq.exceptions.IteratorFlowException;
import sparksoniq.jsoniq.item.BooleanItem;
import sparksoniq.jsoniq.item.StringItem;
import sparksoniq.jsoniq.runtime.iterator.RuntimeIterator;
import sparksoniq.jsoniq.runtime.iterator.functions.base.LocalFunctionCallIterator;
import sparksoniq.jsoniq.runtime.metadata.IteratorMetadata;

import java.util.List;

import org.rumbledb.api.Item;

public class StartsWithFunctionIterator extends LocalFunctionCallIterator {

	private static final long serialVersionUID = 1L;

	public StartsWithFunctionIterator(
            List arguments,
            IteratorMetadata iteratorMetadata) {
        super(arguments, iteratorMetadata);
    }

    @Override
    public Item next() {
        if (this._hasNext) {
            this._hasNext = false;
            StringItem substringItem = this.getSingleItemOfTypeFromIterator(
                this._children.get(1),
                StringItem.class);
            if (substringItem == null || substringItem.getStringValue().isEmpty()) {
                return new BooleanItem(true);
            }
            StringItem stringItem = this.getSingleItemOfTypeFromIterator(
                this._children.get(0),
                StringItem.class);
            if (stringItem == null || stringItem.getStringValue().isEmpty()) {
                return new BooleanItem(false);
            }
            boolean result = stringItem.getStringValue().startsWith(
                substringItem.getStringValue());
            return new BooleanItem(result);
        } else
            throw new IteratorFlowException(
                RuntimeIterator.FLOW_EXCEPTION_MESSAGE + " starts-with function",
                getMetadata());
    }
}