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/*
* ============LICENSE_START=======================================================
* Copyright (C) 2021 Pantheon.tech
* Copyright (C) 2022 Nordix Foundation
* Modifications Copyright (C) 2023 TechMahindra Ltd.
* ================================================================================
* 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.
*
* SPDX-License-Identifier: Apache-2.0
* ============LICENSE_END=========================================================
*/
package org.onap.cps.spi;
import com.google.common.base.Strings;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import lombok.RequiredArgsConstructor;
import org.onap.cps.spi.exceptions.DataValidationException;
@RequiredArgsConstructor
public class FetchDescendantsOption {
public static final FetchDescendantsOption FETCH_DIRECT_CHILDREN_ONLY = new FetchDescendantsOption(1);
public static final FetchDescendantsOption OMIT_DESCENDANTS = new FetchDescendantsOption(0);
public static final FetchDescendantsOption INCLUDE_ALL_DESCENDANTS = new FetchDescendantsOption(-1);
private static final Pattern FETCH_DESCENDANTS_OPTION_PATTERN =
Pattern.compile("^$|^all$|^none$|^[0-9]+$|^-1$");
private final int depth;
/**
* Has next depth.
*
* @return true if next level of depth is available
* @throws IllegalArgumentException when depth less than -1
*/
public boolean hasNext() {
validateDepth(depth);
return depth > 0 || this.depth == INCLUDE_ALL_DESCENDANTS.depth;
}
/**
* Next fetch descendants option.
*
* @return the next fetch descendants option
* @throws IllegalArgumentException when depth less than -1 or 0
*/
public FetchDescendantsOption next() {
if (depth == 0) {
throw new IllegalArgumentException("Do not use next() method with zero depth");
}
final FetchDescendantsOption nextDescendantsOption = this.depth == INCLUDE_ALL_DESCENDANTS.depth
? INCLUDE_ALL_DESCENDANTS : new FetchDescendantsOption(depth - 1);
validateDepth(nextDescendantsOption.depth);
return nextDescendantsOption;
}
/**
* get fetch descendants option for given descendant.
*
* @param fetchDescendantsOptionAsString fetch descendants option string
* @return fetch descendants option for given descendant
*/
public static FetchDescendantsOption getFetchDescendantsOption(final String fetchDescendantsOptionAsString) {
validateFetchDescendantsOption(fetchDescendantsOptionAsString);
if (Strings.isNullOrEmpty(fetchDescendantsOptionAsString)
|| "0".equals(fetchDescendantsOptionAsString) || "none".equals(fetchDescendantsOptionAsString)) {
return FetchDescendantsOption.OMIT_DESCENDANTS;
} else if ("-1".equals(fetchDescendantsOptionAsString) || "all".equals(fetchDescendantsOptionAsString)) {
return FetchDescendantsOption.INCLUDE_ALL_DESCENDANTS;
} else {
final Integer depth = Integer.valueOf(fetchDescendantsOptionAsString);
return new FetchDescendantsOption(depth);
}
}
private static void validateFetchDescendantsOption(final String fetchDescendantsOptionAsString) {
if (Strings.isNullOrEmpty(fetchDescendantsOptionAsString)) {
return;
}
final Matcher matcher = FETCH_DESCENDANTS_OPTION_PATTERN.matcher(fetchDescendantsOptionAsString);
if (!matcher.matches()) {
throw new DataValidationException("FetchDescendantsOption validation error.",
fetchDescendantsOptionAsString + " is not valid fetch descendants option");
}
}
private static void validateDepth(final int depth) {
if (depth < -1) {
throw new IllegalArgumentException("A depth of less than minus one is not allowed");
}
}
}
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