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/*
* ============LICENSE_START=======================================================
* Copyright (C) 2022-2023 Nordix Foundation
* ================================================================================
* 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.cpspath.parser;
import java.util.List;
import lombok.AccessLevel;
import lombok.Getter;
import lombok.NoArgsConstructor;
import lombok.Setter;
import org.antlr.v4.runtime.BaseErrorListener;
import org.antlr.v4.runtime.CharStream;
import org.antlr.v4.runtime.CharStreams;
import org.antlr.v4.runtime.CommonTokenStream;
import org.antlr.v4.runtime.RecognitionException;
import org.antlr.v4.runtime.Recognizer;
import org.onap.cps.cpspath.parser.antlr4.CpsPathLexer;
import org.onap.cps.cpspath.parser.antlr4.CpsPathParser;
@Getter
@Setter
@NoArgsConstructor(access = AccessLevel.PACKAGE)
public class CpsPathUtil {
/**
* Returns a normalized xpath path query.
*
* @param xpathSource xpath
* @return a normalized xpath String.
*/
public static String getNormalizedXpath(final String xpathSource) {
return getCpsPathBuilder(xpathSource).build().getNormalizedXpath();
}
/**
* Returns the parent xpath.
*
* @param xpathSource xpath
* @return the parent xpath String.
*/
public static String getNormalizedParentXpath(final String xpathSource) {
return getCpsPathBuilder(xpathSource).build().getNormalizedParentPath();
}
public static String[] getXpathNodeIdSequence(final String xpathSource) {
final List<String> containerNames = getCpsPathBuilder(xpathSource).build().getContainerNames();
return containerNames.toArray(new String[containerNames.size()]);
}
/**
* Returns boolean indicating xpath is an absolute path to a list element.
*
* @param xpathSource xpath
* @return true if xpath is an absolute path to a list element
*/
public static boolean isPathToListElement(final String xpathSource) {
final CpsPathQuery cpsPathQuery = getCpsPathBuilder(xpathSource).build();
return cpsPathQuery.isPathToListElement();
}
/**
* Returns a cps path query.
*
* @param cpsPathSource cps path
* @return a CpsPathQuery object.
*/
public static CpsPathQuery getCpsPathQuery(final String cpsPathSource) {
return getCpsPathBuilder(cpsPathSource).build();
}
private static CpsPathBuilder getCpsPathBuilder(final String cpsPathSource) {
final CharStream inputStream = CharStreams.fromString(cpsPathSource);
final CpsPathLexer cpsPathLexer = new CpsPathLexer(inputStream);
final CpsPathParser cpsPathParser = new CpsPathParser(new CommonTokenStream(cpsPathLexer));
cpsPathParser.addErrorListener(new BaseErrorListener() {
@Override
public void syntaxError(final Recognizer<?, ?> recognizer, final Object offendingSymbol, final int line,
final int charPositionInLine, final String msg, final RecognitionException e) {
throw new PathParsingException("failed to parse at line " + line + " due to " + msg,
e == null ? "" : e.getMessage());
}
});
final CpsPathBuilder cpsPathBuilder = new CpsPathBuilder();
cpsPathParser.addParseListener(cpsPathBuilder);
cpsPathParser.cpsPath();
return cpsPathBuilder;
}
}
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