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/*
* ============LICENSE_START=======================================================
* Copyright (C) 2021-2023 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.cpspath.parser;
import static org.onap.cps.cpspath.parser.CpsPathPrefixType.DESCENDANT;
import java.util.ArrayList;
import java.util.List;
import org.onap.cps.cpspath.parser.antlr4.CpsPathBaseListener;
import org.onap.cps.cpspath.parser.antlr4.CpsPathParser;
import org.onap.cps.cpspath.parser.antlr4.CpsPathParser.AncestorAxisContext;
import org.onap.cps.cpspath.parser.antlr4.CpsPathParser.DescendantContext;
import org.onap.cps.cpspath.parser.antlr4.CpsPathParser.IncorrectPrefixContext;
import org.onap.cps.cpspath.parser.antlr4.CpsPathParser.LeafConditionContext;
import org.onap.cps.cpspath.parser.antlr4.CpsPathParser.MultipleLeafConditionsContext;
import org.onap.cps.cpspath.parser.antlr4.CpsPathParser.PrefixContext;
import org.onap.cps.cpspath.parser.antlr4.CpsPathParser.TextFunctionConditionContext;
public class CpsPathBuilder extends CpsPathBaseListener {
private static final String OPEN_BRACKET = "[";
private static final String CLOSE_BRACKET = "]";
private final CpsPathQuery cpsPathQuery = new CpsPathQuery();
private final List<CpsPathQuery.DataLeaf> leavesData = new ArrayList<>();
private final StringBuilder normalizedXpathBuilder = new StringBuilder();
private final StringBuilder normalizedAncestorPathBuilder = new StringBuilder();
private boolean processingAncestorAxis = false;
private final List<String> containerNames = new ArrayList<>();
private final List<String> booleanOperators = new ArrayList<>();
private final List<String> comparativeOperators = new ArrayList<>();
@Override
public void exitInvalidPostFix(final CpsPathParser.InvalidPostFixContext ctx) {
throw new PathParsingException(ctx.getText());
}
@Override
public void exitPrefix(final PrefixContext ctx) {
cpsPathQuery.setXpathPrefix(normalizedXpathBuilder.toString());
}
@Override
public void exitParent(final CpsPathParser.ParentContext ctx) {
cpsPathQuery.setNormalizedParentPath(normalizedXpathBuilder.toString());
}
@Override
public void exitIncorrectPrefix(final IncorrectPrefixContext ctx) {
throw new PathParsingException("CPS path can only start with one or two slashes (/)");
}
@Override
public void exitLeafCondition(final LeafConditionContext ctx) {
final Object comparisonValue;
if (ctx.IntegerLiteral() != null) {
comparisonValue = Integer.valueOf(ctx.IntegerLiteral().getText());
} else if (ctx.StringLiteral() != null) {
comparisonValue = unwrapQuotedString(ctx.StringLiteral().getText());
} else {
throw new PathParsingException("Unsupported comparison value encountered in expression" + ctx.getText());
}
leafContext(ctx.leafName(), comparisonValue);
}
@Override
public void exitBooleanOperators(final CpsPathParser.BooleanOperatorsContext ctx) {
booleanOperators.add(ctx.getText());
}
@Override
public void exitComparativeOperators(final CpsPathParser.ComparativeOperatorsContext ctx) {
comparativeOperators.add(ctx.getText());
}
@Override
public void exitDescendant(final DescendantContext ctx) {
cpsPathQuery.setCpsPathPrefixType(DESCENDANT);
cpsPathQuery.setDescendantName(normalizedXpathBuilder.substring(1));
normalizedXpathBuilder.insert(0, "/");
}
@Override
public void enterMultipleLeafConditions(final MultipleLeafConditionsContext ctx) {
normalizedXpathBuilder.append(OPEN_BRACKET);
leavesData.clear();
booleanOperators.clear();
comparativeOperators.clear();
}
@Override
public void exitMultipleLeafConditions(final MultipleLeafConditionsContext ctx) {
normalizedXpathBuilder.append(CLOSE_BRACKET);
cpsPathQuery.setLeavesData(leavesData);
}
@Override
public void enterAncestorAxis(final AncestorAxisContext ctx) {
processingAncestorAxis = true;
}
@Override
public void exitAncestorAxis(final AncestorAxisContext ctx) {
cpsPathQuery.setAncestorSchemaNodeIdentifier(normalizedAncestorPathBuilder.substring(1));
processingAncestorAxis = false;
}
@Override
public void exitTextFunctionCondition(final TextFunctionConditionContext ctx) {
cpsPathQuery.setTextFunctionConditionLeafName(ctx.leafName().getText());
cpsPathQuery.setTextFunctionConditionValue(unwrapQuotedString(ctx.StringLiteral().getText()));
}
@Override
public void exitContainsFunctionCondition(final CpsPathParser.ContainsFunctionConditionContext ctx) {
cpsPathQuery.setContainsFunctionConditionLeafName(ctx.leafName().getText());
cpsPathQuery.setContainsFunctionConditionValue(unwrapQuotedString(ctx.StringLiteral().getText()));
}
@Override
public void enterListElementRef(final CpsPathParser.ListElementRefContext ctx) {
normalizedXpathBuilder.append(OPEN_BRACKET);
if (processingAncestorAxis) {
normalizedAncestorPathBuilder.append(OPEN_BRACKET);
}
}
@Override
public void exitListElementRef(final CpsPathParser.ListElementRefContext ctx) {
normalizedXpathBuilder.append(CLOSE_BRACKET);
if (processingAncestorAxis) {
normalizedAncestorPathBuilder.append(CLOSE_BRACKET);
}
}
CpsPathQuery build() {
cpsPathQuery.setNormalizedXpath(normalizedXpathBuilder.toString());
cpsPathQuery.setContainerNames(containerNames);
cpsPathQuery.setBooleanOperators(booleanOperators);
cpsPathQuery.setComparativeOperators(comparativeOperators);
return cpsPathQuery;
}
@Override
public void exitContainerName(final CpsPathParser.ContainerNameContext ctx) {
final String containerName = ctx.getText();
normalizedXpathBuilder.append("/")
.append(containerName);
containerNames.add(containerName);
if (processingAncestorAxis) {
normalizedAncestorPathBuilder.append("/").append(containerName);
}
}
private void leafContext(final CpsPathParser.LeafNameContext ctx, final Object comparisonValue) {
leavesData.add(new CpsPathQuery.DataLeaf(ctx.getText(), comparisonValue));
appendCondition(normalizedXpathBuilder, ctx.getText(), comparisonValue);
if (processingAncestorAxis) {
appendCondition(normalizedAncestorPathBuilder, ctx.getText(), comparisonValue);
}
}
private void appendCondition(final StringBuilder currentNormalizedPathBuilder, final String name,
final Object value) {
final char lastCharacter = currentNormalizedPathBuilder.charAt(currentNormalizedPathBuilder.length() - 1);
final boolean isStartOfExpression = lastCharacter == '[';
if (!isStartOfExpression) {
currentNormalizedPathBuilder.append(" ").append(getLastElement(booleanOperators)).append(" ");
}
currentNormalizedPathBuilder.append("@")
.append(name)
.append(getLastElement(comparativeOperators))
.append("'")
.append(value.toString().replace("'", "''"))
.append("'");
}
private static String getLastElement(final List<String> listOfStrings) {
return listOfStrings.get(listOfStrings.size() - 1);
}
private static String unwrapQuotedString(final String wrappedString) {
final boolean wasWrappedInSingleQuote = wrappedString.startsWith("'");
final String value = stripFirstAndLastCharacter(wrappedString);
if (wasWrappedInSingleQuote) {
return value.replace("''", "'");
} else {
return value.replace("\"\"", "\"");
}
}
private static String stripFirstAndLastCharacter(final String wrappedString) {
return wrappedString.substring(1, wrappedString.length() - 1);
}
}
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