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/*******************************************************************************
* Copyright (c) 2015 Sebastien Arod 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
*
* Contributors:
* Sebastien Arod - Initial implementation
*******************************************************************************/
package org.eclipse.tycho.versions.bundle;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.Enumeration;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.regex.Pattern;
import org.eclipse.osgi.util.ManifestElement;
import org.osgi.framework.BundleException;
import org.osgi.framework.Constants;
/**
* This class is similar to {@link ManifestElement} but supports changing value for attributes with
* a single value.
*
*/
public class MutableManifestElement {
private enum ParameterType {
DIRECTIVE(":="), ATTRIBUTE("=");
public final String separator;
ParameterType(String separator) {
this.separator = separator;
}
}
/**
* See extended definition in osgi core spec at paragraph 1.3.2 General Syntax Definitions
*/
private static final Pattern OSGI_EXTENDED_PATTERN = Pattern.compile("([a-zA-Z0-9_-]|\\+)+");
private static final String DIRECTIVE_INDENT = " ";
private static final String VALUE_COMPONENT_INDENT = " ";
private static final int NO_WRAP = Integer.MAX_VALUE;
private static final String XFRIENDS_DIRECTIVE = "x-friends";
private static final int DEFAULT_WRAP_FOR_LONG_DIRECTIVES = 3;
private final String value;
// Use LinkedHashMap to preserve original order
private final LinkedHashMap> directives;
// Use LinkedHashMap to preserve original order
private final LinkedHashMap> attributes;
public MutableManifestElement(String value, Map attributes, Map directives) {
this.value = value;
this.attributes = toMapOfSingletonLists(attributes);
this.directives = toMapOfSingletonLists(directives);
}
private LinkedHashMap> toMapOfSingletonLists(Map params) {
LinkedHashMap> withSingletonLists = new LinkedHashMap<>();
for (Map.Entry param : params.entrySet()) {
withSingletonLists.put(param.getKey(), Collections.singletonList(param.getValue()));
}
return withSingletonLists;
}
private MutableManifestElement(ManifestElement manifestElement) {
// FIXME should we keep support for duplicate directives/attributes this does not seem to be valid OSGI and adds useless complexity.
this.value = manifestElement.getValue();
this.attributes = new LinkedHashMap<>();
this.directives = new LinkedHashMap<>();
Enumeration attrKeys = manifestElement.getKeys();
if (attrKeys != null) {
while (attrKeys.hasMoreElements()) {
String attrKey = attrKeys.nextElement();
this.attributes.put(attrKey, Arrays.asList(manifestElement.getAttributes(attrKey)));
}
}
Enumeration directiveKeys = manifestElement.getDirectiveKeys();
if (directiveKeys != null) {
while (directiveKeys.hasMoreElements()) {
String directiveName = directiveKeys.nextElement();
this.directives.put(directiveName, Arrays.asList(manifestElement.getDirectives(directiveName)));
}
}
}
public static List parseHeader(String name, String value) throws BundleException {
ManifestElement[] manifestElements = ManifestElement.parseHeader(name, value);
if (manifestElements == null) {
return null;
}
List mutableManifestElements = new ArrayList<>();
for (ManifestElement manifestElement : manifestElements) {
mutableManifestElements.add(new MutableManifestElement(manifestElement));
}
return mutableManifestElements;
}
/**
*
* @return
* @see ManifestElement#getValue()
*/
public String getValue() {
return value;
}
/**
* Set the value for the specified attribute. If previous values existed they are replaced.
*
* @param key
* @param value
* @return returns true if the manifest element changed due to this call. false if the value was
* already the same.
*/
public boolean setAttribute(String key, String value) {
if (value == null) {
if (attributes.containsKey(key)) {
attributes.remove(key);
return true;
} else {
return false;
}
} else {
List newValue = Collections.singletonList(value);
if (!newValue.equals(attributes.get(key))) {
attributes.put(key, Collections.singletonList(value));
return true;
} else {
return false;
}
}
}
/**
* Returns the value for the specified attribute or null if it does not exist. If
* the attribute has multiple values specified then the last value specified is returned.
*
* @param key
* @return
* @see ManifestElement#getAttribute(String)
*/
public String getAttribute(String key) {
List values = attributes.get(key);
if (values != null && !values.isEmpty()) {
return values.get(values.size() - 1);
}
return null;
}
@Override
public String toString() {
return write();
}
public String write() {
if (directives.isEmpty() && attributes.isEmpty()) {
return value;
}
StringBuilder builder = new StringBuilder(value);
// Write attributes
for (Entry> attribute : attributes.entrySet()) {
for (String attributeValue : attribute.getValue()) {
builder.append(writeParameter(attribute.getKey(), attributeValue, ParameterType.ATTRIBUTE, NO_WRAP));
}
}
// Write directives
// Follow the formatting of PDE for special directives "uses" and "x-friends"
// see org.eclipse.pde.internal.core.text.bundle.ExportPackageObject.appendValuesToBuffer(StringBuffer, TreeMap)
List uses = directives.get(Constants.USES_DIRECTIVE);
List xfriends = directives.get(XFRIENDS_DIRECTIVE);
for (Entry> directive : directives.entrySet()) {
String directiveName = directive.getKey();
if (!directiveName.equals(Constants.USES_DIRECTIVE) && !directiveName.equals(XFRIENDS_DIRECTIVE)) {
for (String directiveValue : directive.getValue()) {
builder.append(writeParameter(directiveName, directiveValue, ParameterType.DIRECTIVE, NO_WRAP));
}
}
}
int longDirectiveLimit = DEFAULT_WRAP_FOR_LONG_DIRECTIVES;
if (uses != null && xfriends != null) {
longDirectiveLimit = 1;
}
if (xfriends != null) {
for (String directiveValue : xfriends) {
builder.append(writeParameter(XFRIENDS_DIRECTIVE, directiveValue, ParameterType.DIRECTIVE,
longDirectiveLimit));
}
}
if (uses != null) {
for (String directiveValue : uses) {
builder.append(writeParameter(Constants.USES_DIRECTIVE, directiveValue, ParameterType.DIRECTIVE,
longDirectiveLimit));
}
}
return builder.toString();
}
private static String writeParameter(String paramName, String parameterValue, ParameterType paramType,
int valueComponentLimit) {
String[] valueComponents = ManifestElement.getArrayFromList(parameterValue, ",");
boolean breakLines = valueComponents.length >= valueComponentLimit;
StringBuilder builder = new StringBuilder();
builder.append(";");
if (breakLines) {
builder.append("\n" + DIRECTIVE_INDENT);
}
builder.append(paramName);
builder.append(paramType.separator);
if (paramValueNeedsQuotes(parameterValue)) {
builder.append('\"');
for (int i = 0; i < valueComponents.length; i++) {
builder.append(valueComponents[i]);
if (i != valueComponents.length - 1) {
builder.append(",");
if (breakLines) {
builder.append("\n" + VALUE_COMPONENT_INDENT);
}
}
}
builder.append('\"');
} else {
builder.append(parameterValue);
}
return builder.toString();
}
private static boolean paramValueNeedsQuotes(String value) {
return !OSGI_EXTENDED_PATTERN.matcher(value).matches();
}
}
