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/*******************************************************************************
* Copyright (c) 2007, 2009 IBM Corporation 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:
* IBM Corporation - Initial API and implementation
* James Blackburn (Broadcom Corp.)
*******************************************************************************/
package org.eclipse.cdt.internal.core.language;
import java.io.IOException;
import java.io.StringReader;
import java.io.StringWriter;
import java.util.Iterator;
import java.util.Map;
import java.util.TreeMap;
import java.util.Map.Entry;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.TransformerFactoryConfigurationError;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import org.eclipse.cdt.core.CCorePlugin;
import org.eclipse.cdt.core.CCorePreferenceConstants;
import org.eclipse.cdt.core.ICDescriptor;
import org.eclipse.cdt.core.language.ProjectLanguageConfiguration;
import org.eclipse.cdt.core.language.WorkspaceLanguageConfiguration;
import org.eclipse.cdt.core.settings.model.ICStorageElement;
import org.eclipse.cdt.internal.core.Util;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.Preferences;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
/**
* Serializes and deserializes language mappings to and from persistent storage.
*/
public class LanguageMappingStore {
private static final String LANGUAGE_MAPPING_ID = "org.eclipse.cdt.core.language.mapping"; //$NON-NLS-1$
private static final String PROJECT_MAPPINGS = "project-mappings"; //$NON-NLS-1$
private static final String WORKSPACE_MAPPINGS = "workspace-mappings"; //$NON-NLS-1$
private static final String CONTENT_TYPE_MAPPING = "content-type-mapping"; //$NON-NLS-1$
private static final String FILE_MAPPING = "file-mapping"; //$NON-NLS-1$
private static final String ATTRIBUTE_PATH = "path"; //$NON-NLS-1$
private static final String ATTRIBUTE_CONTENT_TYPE = "content-type"; //$NON-NLS-1$
private static final String ATTRIBUTE_LANGUAGE = "language"; //$NON-NLS-1$
private static final String ATTRIBUTE_CONFIGURATION = "configuration"; //$NON-NLS-1$
public LanguageMappingStore() {
}
public ProjectLanguageConfiguration decodeMappings(IProject project) throws CoreException {
ProjectLanguageConfiguration config = new ProjectLanguageConfiguration();
ICDescriptor descriptor = getProjectDescription(project);
ICStorageElement rootElement = descriptor.getProjectStorageElement(LANGUAGE_MAPPING_ID);
if (rootElement == null) {
return config;
}
ICStorageElement[] mappingElements = rootElement.getChildrenByName(PROJECT_MAPPINGS);
if (mappingElements.length > 0) {
ICStorageElement element = mappingElements[0];
config.setContentTypeMappings(decodeProjectContentTypeMappings(element));
config.setFileMappings(decodeFileMappings(element));
}
return config;
}
private Map<String, Map<String, String>> decodeProjectContentTypeMappings(ICStorageElement rootElement) {
Map<String, Map<String, String>> decodedMappings = new TreeMap<String, Map<String, String>>();
ICStorageElement[] mappingElements = rootElement.getChildrenByName(CONTENT_TYPE_MAPPING);
for (int j = 0; j < mappingElements.length; j++) {
ICStorageElement mapping = mappingElements[j];
String configuration = mapping.getAttribute(ATTRIBUTE_CONFIGURATION);
Map<String, String> contentTypeMappings = decodedMappings.get(configuration);
if (contentTypeMappings == null) {
contentTypeMappings = new TreeMap<String, String>();
decodedMappings.put(configuration, contentTypeMappings);
}
String contentType = mapping.getAttribute(ATTRIBUTE_CONTENT_TYPE);
String language = mapping.getAttribute(ATTRIBUTE_LANGUAGE);
contentTypeMappings.put(contentType, language);
}
return decodedMappings;
}
protected ICDescriptor getProjectDescription(IProject project) throws CoreException {
return CCorePlugin.getDefault().getCProjectDescription(project, true);
}
private Map<String, String> decodeContentTypeMappings(Element rootElement) throws CoreException {
return decodeMappings(rootElement, CONTENT_TYPE_MAPPING, ATTRIBUTE_CONTENT_TYPE, ATTRIBUTE_LANGUAGE);
}
private Map<String, Map<String, String>> decodeFileMappings(ICStorageElement rootElement) throws CoreException {
Map<String, Map<String, String>> decodedMappings = new TreeMap<String, Map<String, String>>();
ICStorageElement[] mappingElements = rootElement.getChildrenByName(FILE_MAPPING);
for (int j = 0; j < mappingElements.length; j++) {
ICStorageElement mapping = mappingElements[j];
String path = mapping.getAttribute(ATTRIBUTE_PATH);
Map<String, String> configurationMappings = decodedMappings.get(path);
if (configurationMappings == null) {
configurationMappings = new TreeMap<String, String>();
decodedMappings.put(path, configurationMappings);
}
String configuration = mapping.getAttribute(ATTRIBUTE_CONFIGURATION);
String language = mapping.getAttribute(ATTRIBUTE_LANGUAGE);
configurationMappings.put(configuration, language);
}
return decodedMappings;
}
private Map<String, String> decodeMappings(Element rootElement, String category, String keyName, String valueName) {
Map<String, String> decodedMappings = new TreeMap<String, String>();
NodeList mappingElements = rootElement.getElementsByTagName(category);
for (int j = 0; j < mappingElements.getLength(); j++) {
Element mapping = (Element) mappingElements.item(j);
String key = mapping.getAttribute(keyName);
String value = mapping.getAttribute(valueName);
decodedMappings.put(key, value);
}
return decodedMappings;
}
public void storeMappings(IProject project, ProjectLanguageConfiguration config) throws CoreException {
ICDescriptor descriptor = getProjectDescription(project);
ICStorageElement rootElement = descriptor.getProjectStorageElement(LANGUAGE_MAPPING_ID);
// clear all children and settings
rootElement.clear();
ICStorageElement projectMappings = rootElement.createChild(PROJECT_MAPPINGS);
addProjectContentTypeMappings(config.getContentTypeMappings(), projectMappings);
addFileMappings(config.getFileMappings(), projectMappings);
descriptor.saveProjectData();
}
private void addProjectContentTypeMappings(Map<String, Map<String, String>> contentTypeMappings, ICStorageElement rootElement) {
Iterator<Entry<String, Map<String, String>>> entries = contentTypeMappings.entrySet().iterator();
while (entries.hasNext()) {
Entry<String, Map<String, String>> entry = entries.next();
String configuration = entry.getKey();
Iterator<Entry<String, String>> contentTypeEntries = entry.getValue().entrySet().iterator();
while (contentTypeEntries.hasNext()) {
Entry<String, String> configurationEntry = contentTypeEntries.next();
String contentType = configurationEntry.getKey();
String language = configurationEntry.getValue();
ICStorageElement mapping = rootElement.createChild(CONTENT_TYPE_MAPPING);
mapping.setAttribute(ATTRIBUTE_CONTENT_TYPE, contentType);
mapping.setAttribute(ATTRIBUTE_CONFIGURATION, configuration);
mapping.setAttribute(ATTRIBUTE_LANGUAGE, language);
}
}
}
public void storeMappings(WorkspaceLanguageConfiguration config) throws CoreException {
try {
// Encode mappings as XML and serialize as a String.
Document doc = DocumentBuilderFactory.newInstance().newDocumentBuilder().newDocument();
Element rootElement = doc.createElement(WORKSPACE_MAPPINGS);
doc.appendChild(rootElement);
addContentTypeMappings(config.getWorkspaceMappings(), rootElement);
Transformer serializer = createSerializer();
DOMSource source = new DOMSource(doc);
StringWriter buffer = new StringWriter();
StreamResult result = new StreamResult(buffer);
serializer.transform(source, result);
String encodedMappings = buffer.getBuffer().toString();
Preferences node = CCorePlugin.getDefault().getPluginPreferences();
node.setValue(CCorePreferenceConstants.WORKSPACE_LANGUAGE_MAPPINGS, encodedMappings);
CCorePlugin.getDefault().savePluginPreferences();
} catch (ParserConfigurationException e) {
throw new CoreException(Util.createStatus(e));
} catch (TransformerException e) {
throw new CoreException(Util.createStatus(e));
}
}
public WorkspaceLanguageConfiguration decodeWorkspaceMappings() throws CoreException {
Preferences node = CCorePlugin.getDefault().getPluginPreferences();
String encodedMappings = node.getString(CCorePreferenceConstants.WORKSPACE_LANGUAGE_MAPPINGS);
WorkspaceLanguageConfiguration config = new WorkspaceLanguageConfiguration();
if (encodedMappings == null || encodedMappings.length() == 0) {
return config;
}
// The mappings are encoded as XML in a String so we need to parse it.
InputSource input = new InputSource(new StringReader(encodedMappings));
try {
Document document = DocumentBuilderFactory.newInstance().newDocumentBuilder().parse(input);
config.setWorkspaceMappings(decodeContentTypeMappings(document.getDocumentElement()));
return config;
} catch (SAXException e) {
throw new CoreException(Util.createStatus(e));
} catch (IOException e) {
throw new CoreException(Util.createStatus(e));
} catch (ParserConfigurationException e) {
throw new CoreException(Util.createStatus(e));
}
}
private Transformer createSerializer() throws CoreException {
try {
return TransformerFactory.newInstance().newTransformer();
} catch (TransformerConfigurationException e) {
throw new CoreException(Util.createStatus(e));
} catch (TransformerFactoryConfigurationError e) {
throw new CoreException(Util.createStatus(e));
}
}
private void addMappings(Map<String, String> mappings, Element rootElement, String category, String keyName, String valueName) {
Document document = rootElement.getOwnerDocument();
Iterator<Entry<String, String>> entries = mappings.entrySet().iterator();
while (entries.hasNext()) {
Entry<String, String> entry = entries.next();
Element mapping = document.createElement(category);
mapping.setAttribute(keyName, entry.getKey());
mapping.setAttribute(valueName, entry.getValue());
rootElement.appendChild(mapping);
}
}
private void addContentTypeMappings(Map<String, String> mappings, Element rootElement) {
addMappings(mappings, rootElement, CONTENT_TYPE_MAPPING, ATTRIBUTE_CONTENT_TYPE, ATTRIBUTE_LANGUAGE);
}
private void addFileMappings(Map<String, Map<String, String>> mappings, ICStorageElement rootElement) {
for (Map.Entry<String, Map<String, String>> entry : mappings.entrySet()) {
ICStorageElement mapping = rootElement.createChild(FILE_MAPPING);
String path = entry.getKey();
for (Entry<String, String> configurationEntry : entry.getValue().entrySet()) {
String configuration = configurationEntry.getKey();
String language = configurationEntry.getValue();
mapping.setAttribute(ATTRIBUTE_PATH, path);
mapping.setAttribute(ATTRIBUTE_CONFIGURATION, configuration);
mapping.setAttribute(ATTRIBUTE_LANGUAGE, language);
}
}
}
}
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