sparksoniq.jsoniq.runtime.iterator.functions.strings.StringLengthFunctionIterator Maven / Gradle / Ivy

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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 org.rumbledb.api.Item;
import sparksoniq.jsoniq.item.ItemFactory;
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;

public class StringLengthFunctionIterator extends LocalFunctionCallIterator {

	private static final long serialVersionUID = 1L;

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

    @Override
    public Item next() {
        if (this._hasNext) {
            this._hasNext = false;

            StringItem stringItem = this.getSingleItemOfTypeFromIterator(
                    this._children.get(0),
                    StringItem.class);

            if (stringItem == null) {
                return ItemFactory.getInstance().createIntegerItem(0);
            }

            return ItemFactory.getInstance().createIntegerItem(stringItem.getStringValue().length());
        } else
            throw new IteratorFlowException(
                RuntimeIterator.FLOW_EXCEPTION_MESSAGE + " string-length function",
                getMetadata());
    }
}