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/*
* Copyright (c) 2014 Cisco Systems, Inc. and others. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v1.0 which accompanies this distribution,
* and is available at http://www.eclipse.org/legal/epl-v10.html
*/
package org.opendaylight.restconf.common.util;
import static java.util.Objects.requireNonNull;
import java.io.IOException;
import java.io.InputStream;
import java.io.PushbackInputStream;
import java.util.ArrayList;
import java.util.List;
import java.util.Optional;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import javax.xml.stream.events.StartElement;
import org.opendaylight.restconf.common.util.IdentityValuesDTO.IdentityValue;
import org.opendaylight.restconf.common.util.IdentityValuesDTO.Predicate;
import org.opendaylight.yangtools.yang.model.api.TypeDefinition;
public final class RestUtil {
// FIXME: BUG-1275: this is code duplicates data.impl.codec
public static final String SQUOTE = "'";
public static final String DQUOTE = "\"";
private static final Pattern PREDICATE_PATTERN = Pattern.compile("\\[(.*?)\\]");
private RestUtil() {
}
public static TypeDefinition<?> resolveBaseTypeFrom(final TypeDefinition<?> type) {
TypeDefinition<?> superType = type;
while (superType.getBaseType() != null) {
superType = superType.getBaseType();
}
return superType;
}
/**
* Utility method to find out if is provided {@link InputStream} empty.
*
* @param entityStream {@link InputStream} to be checked if it is empty.
* @return Empty Optional if provided input stream is empty or Optional
* containing input stream otherwise.
*
* @throws IOException if an IO error arises during stream inspection.
* @throws NullPointerException if provided stream is null.
*
*/
public static Optional<InputStream> isInputStreamEmpty(final InputStream entityStream) throws IOException {
final PushbackInputStream pushbackInputStream = new PushbackInputStream(requireNonNull(entityStream));
int firstByte = pushbackInputStream.read();
if (firstByte == -1) {
return Optional.empty();
} else {
pushbackInputStream.unread(firstByte);
return Optional.of(pushbackInputStream);
}
}
public static IdentityValuesDTO asInstanceIdentifier(final String value, final PrefixesMaping prefixMap) {
final String valueTrimmed = value.trim();
if (!valueTrimmed.startsWith("/")) {
return null;
}
final String[] xPathParts = valueTrimmed.split("/");
if (xPathParts.length < 2) { // must be at least "/pr:node"
return null;
}
final IdentityValuesDTO identityValuesDTO = new IdentityValuesDTO(value);
for (int i = 1; i < xPathParts.length; i++) {
final String xPathPartTrimmed = xPathParts[i].trim();
final String xPathPartStr = getIdAndPrefixAsStr(xPathPartTrimmed);
final IdentityValue identityValue = toIdentity(xPathPartStr, prefixMap);
if (identityValue == null) {
return null;
}
final List<Predicate> predicates = toPredicates(xPathPartTrimmed, prefixMap);
if (predicates == null) {
return null;
}
identityValue.setPredicates(predicates);
identityValuesDTO.add(identityValue);
}
return identityValuesDTO.getValuesWithNamespaces().isEmpty() ? null : identityValuesDTO;
}
private static String getIdAndPrefixAsStr(final String pathPart) {
final int predicateStartIndex = pathPart.indexOf("[");
return predicateStartIndex == -1 ? pathPart : pathPart.substring(0, predicateStartIndex);
}
private static IdentityValue toIdentity(final String xpathPart, final PrefixesMaping prefixMap) {
final String xPathPartTrimmed = xpathPart.trim();
if (xPathPartTrimmed.isEmpty()) {
return null;
}
final String[] prefixAndIdentifier = xPathPartTrimmed.split(":");
// it is not "prefix:value"
if (prefixAndIdentifier.length != 2) {
return null;
}
final String prefix = prefixAndIdentifier[0].trim();
final String identifier = prefixAndIdentifier[1].trim();
if (prefix.isEmpty() || identifier.isEmpty()) {
return null;
}
final String namespace = prefixMap.getNamespace(prefix);
return new IdentityValue(namespace, identifier);
}
private static List<Predicate> toPredicates(final String predicatesStr, final PrefixesMaping prefixMap) {
final List<Predicate> result = new ArrayList<>();
final List<String> predicates = new ArrayList<>();
final Matcher matcher = PREDICATE_PATTERN.matcher(predicatesStr);
while (matcher.find()) {
predicates.add(matcher.group(1).trim());
}
for (final String predicate : predicates) {
final int indexOfEqualityMark = predicate.indexOf("=");
if (indexOfEqualityMark != -1) {
final String predicateValue = toPredicateValue(predicate.substring(indexOfEqualityMark + 1));
if (predicate.startsWith(".")) { // it is leaf-list
if (predicateValue == null) {
return null;
}
result.add(new Predicate(null, predicateValue));
} else {
final IdentityValue identityValue =
toIdentity(predicate.substring(0, indexOfEqualityMark), prefixMap);
if (identityValue == null || predicateValue == null) {
return null;
}
result.add(new Predicate(identityValue, predicateValue));
}
}
}
return result;
}
private static String toPredicateValue(final String predicatedValue) {
final String predicatedValueTrimmed = predicatedValue.trim();
if ((predicatedValueTrimmed.startsWith(DQUOTE) || predicatedValueTrimmed.startsWith(SQUOTE))
&& (predicatedValueTrimmed.endsWith(DQUOTE) || predicatedValueTrimmed.endsWith(SQUOTE))) {
return predicatedValueTrimmed.substring(1, predicatedValueTrimmed.length() - 1);
}
return null;
}
public interface PrefixesMaping {
String getNamespace(String prefix);
}
public static class PrefixMapingFromXml implements PrefixesMaping {
StartElement startElement = null;
public PrefixMapingFromXml(final StartElement startElement) {
this.startElement = startElement;
}
@Override
public String getNamespace(final String prefix) {
return startElement.getNamespaceContext().getNamespaceURI(prefix);
}
}
public static class PrefixMapingFromJson implements PrefixesMaping {
@Override
public String getNamespace(final String prefix) {
return prefix;
}
}
}
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