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/*
* ============LICENSE_START=======================================================
* Copyright (C) 2021 Nordix Foundation
* Modifications Copyright (C) 2021 Bell Canada.
* ================================================================================
* 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.query;
import static org.springframework.util.StringUtils.isEmpty;
import java.util.HashMap;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import lombok.AccessLevel;
import lombok.Getter;
import lombok.Setter;
import org.onap.cps.spi.exceptions.CpsPathException;
@Getter
@Setter(AccessLevel.PRIVATE)
public class CpsPathQuery {
private CpsPathQueryType cpsPathQueryType;
private String xpathPrefix;
private String leafName;
private Object leafValue;
private String descendantName;
private Map<String, Object> leavesData;
private String ancestorSchemaNodeIdentifier;
private static final String NON_CAPTURING_GROUP_1_TO_99_YANG_CONTAINERS = "((?:\\/[^\\/]+){1,99})";
private static final String YANG_LEAF_VALUE_EQUALS_CONDITION =
"\\[\\s{0,9}@(\\S+?)\\s{0,9}=\\s{0,9}(.*?)\\s{0,9}\\]";
private static final Pattern QUERY_CPS_PATH_WITH_SINGLE_LEAF_PATTERN =
Pattern.compile(NON_CAPTURING_GROUP_1_TO_99_YANG_CONTAINERS + YANG_LEAF_VALUE_EQUALS_CONDITION);
private static final Pattern DESCENDANT_ANYWHERE_PATTERN = Pattern.compile("\\/\\/([^\\/][^:]+)");
private static final Pattern LEAF_INTEGER_VALUE_PATTERN = Pattern.compile("[-+]?\\d+");
private static final Pattern LEAF_STRING_VALUE_IN_SINGLE_QUOTES_PATTERN = Pattern.compile("'(.*)'");
private static final Pattern LEAF_STRING_VALUE_IN_DOUBLE_QUOTES_PATTERN = Pattern.compile("\"(.*)\"");
private static final String YANG_MULTIPLE_LEAF_VALUE_EQUALS_CONDITION = "\\[(.*?)\\s{0,9}]";
private static final Pattern DESCENDANT_ANYWHERE_PATTERN_WITH_MULTIPLE_LEAF_PATTERN =
Pattern.compile(DESCENDANT_ANYWHERE_PATTERN + YANG_MULTIPLE_LEAF_VALUE_EQUALS_CONDITION);
private static final String INDIVIDUAL_LEAF_DETAIL_PATTERN = ("\\s{1,9}and\\s{1,9}");
private static final Pattern LEAF_VALUE_PATTERN = Pattern.compile("@(\\S+?)=(.*)");
private static final Pattern ANCESTOR_AXIS_PATTERN = Pattern.compile("(\\S+)\\/ancestor::\\/?(\\S+)");
/**
* Returns a cps path query.
*
* @param cpsPathSource cps path
* @return a CpsPath object.
*/
public static CpsPathQuery createFrom(final String cpsPathSource) {
var cpsPath = cpsPathSource;
final CpsPathQuery cpsPathQuery = new CpsPathQuery();
var matcher = ANCESTOR_AXIS_PATTERN.matcher(cpsPath);
if (matcher.matches()) {
cpsPath = matcher.group(1);
cpsPathQuery.setAncestorSchemaNodeIdentifier(matcher.group(2));
}
matcher = QUERY_CPS_PATH_WITH_SINGLE_LEAF_PATTERN.matcher(cpsPath);
if (matcher.matches()) {
cpsPathQuery.setParametersForSingleLeafValue(cpsPath, matcher);
return cpsPathQuery;
}
matcher = DESCENDANT_ANYWHERE_PATTERN_WITH_MULTIPLE_LEAF_PATTERN.matcher(cpsPath);
if (matcher.matches()) {
cpsPathQuery.setParametersForDescendantWithLeafValues(cpsPath, matcher);
return cpsPathQuery;
}
matcher = DESCENDANT_ANYWHERE_PATTERN.matcher(cpsPath);
if (matcher.matches()) {
cpsPathQuery.setParametersForDescendantAnywhere(matcher);
return cpsPathQuery;
}
throw new CpsPathException("Invalid cps path.",
String.format("Cannot interpret or parse cps path '%s'.", cpsPath));
}
/**
* Has ancestor axis been populated.
*
* @return boolean value.
*/
public boolean hasAncestorAxis() {
return !(isEmpty(ancestorSchemaNodeIdentifier));
}
private void setParametersForSingleLeafValue(final String cpsPath, final Matcher matcher) {
setCpsPathQueryType(CpsPathQueryType.XPATH_LEAF_VALUE);
setXpathPrefix(matcher.group(1));
setLeafName(matcher.group(2));
setLeafValue(convertLeafValueToCorrectType(matcher.group(3), cpsPath));
}
private void setParametersForDescendantWithLeafValues(final String cpsPath, final Matcher matcher) {
setCpsPathQueryType(CpsPathQueryType.XPATH_HAS_DESCENDANT_WITH_LEAF_VALUES);
setDescendantName(matcher.group(1));
final Map<String, Object> leafData = new HashMap<>();
for (final String leafValuePair : matcher.group(2).split(INDIVIDUAL_LEAF_DETAIL_PATTERN)) {
final var descendentMatcher = LEAF_VALUE_PATTERN.matcher(leafValuePair);
if (descendentMatcher.matches()) {
leafData.put(descendentMatcher.group(1),
convertLeafValueToCorrectType(descendentMatcher.group(2), cpsPath));
} else {
throw new CpsPathException("Invalid cps path.",
String.format("Cannot interpret or parse attributes in cps path '%s'.", cpsPath));
}
}
setLeavesData(leafData);
}
private void setParametersForDescendantAnywhere(final Matcher matcher) {
setCpsPathQueryType(CpsPathQueryType.XPATH_HAS_DESCENDANT_ANYWHERE);
setDescendantName(matcher.group(1));
}
private static Object convertLeafValueToCorrectType(final String leafValueString, final String cpsPath) {
final var stringValueWithSingleQuotesMatcher =
LEAF_STRING_VALUE_IN_SINGLE_QUOTES_PATTERN.matcher(leafValueString);
if (stringValueWithSingleQuotesMatcher.matches()) {
return stringValueWithSingleQuotesMatcher.group(1);
}
final var stringValueWithDoubleQuotesMatcher =
LEAF_STRING_VALUE_IN_DOUBLE_QUOTES_PATTERN.matcher(leafValueString);
if (stringValueWithDoubleQuotesMatcher.matches()) {
return stringValueWithDoubleQuotesMatcher.group(1);
}
final var integerValueMatcher = LEAF_INTEGER_VALUE_PATTERN.matcher(leafValueString);
if (integerValueMatcher.matches()) {
return Integer.valueOf(leafValueString);
}
throw new CpsPathException("Unsupported leaf value.",
String.format("Unsupported leaf value '%s' in cps path '%s'.", leafValueString, cpsPath));
}
}
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