package at.bestsolution.efxclipse.text.editor.text.templates;
import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.text.MessageFormat;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.PropertyResourceBundle;
import java.util.ResourceBundle;
import org.osgi.framework.Bundle;
import org.eclipse.core.runtime.FileLocator;
import org.eclipse.core.runtime.IConfigurationElement;
import org.eclipse.core.runtime.Path;
import org.eclipse.core.runtime.Platform;
import org.eclipse.jface.text.templates.Template;
import org.eclipse.jface.text.templates.TemplateException;
import at.bestsolution.efxclipse.jface.preferences.IPreferenceStore;
import at.bestsolution.efxclipse.text.editor.internal.TextEditorPlugin;
import at.bestsolution.efxclipse.text.jface.templates.ContextTypeRegistry;
import at.bestsolution.efxclipse.text.jface.templates.persistence.TemplatePersistenceData;
import at.bestsolution.efxclipse.text.jface.templates.persistence.TemplateReaderWriter;
import at.bestsolution.efxclipse.text.jface.templates.persistence.TemplateStore;
/**
* Manages templates. Handles reading default templates contributed via XML and
* user-defined (or overridden) templates stored in the preferences.
* <p>
* Clients may instantiate but not subclass this class.
* </p>
*
* @since 3.0
* @noextend This class is not intended to be subclassed by clients.
*/
public class ContributionTemplateStore extends TemplateStore {
/* extension point string literals */
private static final String TEMPLATES_EXTENSION_POINT= "org.eclipse.ui.editors.templates"; //$NON-NLS-1$
private static final String ID= "id"; //$NON-NLS-1$
private static final String NAME= "name"; //$NON-NLS-1$
private static final String CONTEXT_TYPE_ID= "contextTypeId"; //$NON-NLS-1$
private static final String DESCRIPTION= "description"; //$NON-NLS-1$
private static final String AUTO_INSERT= "autoinsert"; //$NON-NLS-1$
private static final String TEMPLATE= "template"; //$NON-NLS-1$
private static final String PATTERN= "pattern"; //$NON-NLS-1$
private static final String INCLUDE= "include"; //$NON-NLS-1$
private static final String FILE= "file"; //$NON-NLS-1$
private static final String TRANSLATIONS= "translations"; //$NON-NLS-1$
/**
* Creates a new template store.
*
* @param store the preference store in which to store custom templates
* under <code>key</code>
* @param key the key into <code>store</code> where to store custom
* templates
*/
public ContributionTemplateStore(IPreferenceStore store, String key) {
super(store, key);
}
/**
* Creates a new template store with a context type registry. Only templates
* that specify a context type contained in the registry will be loaded by
* this store if the registry is not <code>null</code>.
*
* @param registry a context type registry, or <code>null</code> if all
* templates should be loaded
* @param store the preference store in which to store custom templates
* under <code>key</code>
* @param key the key into <code>store</code> where to store custom
* templates
*/
public ContributionTemplateStore(ContextTypeRegistry registry, IPreferenceStore store, String key) {
super(registry, store, key);
}
/**
* Loads the templates contributed via the templates extension point.
*
* @throws IOException {@inheritDoc}
*/
protected void loadContributedTemplates() throws IOException {
IConfigurationElement[] extensions= getTemplateExtensions();
Collection contributed= readContributedTemplates(extensions);
for (Iterator it= contributed.iterator(); it.hasNext();) {
TemplatePersistenceData data= (TemplatePersistenceData) it.next();
internalAdd(data);
}
}
private Collection readContributedTemplates(IConfigurationElement[] extensions) throws IOException {
Collection templates= new ArrayList();
for (int i= 0; i < extensions.length; i++) {
if (extensions[i].getName().equals(TEMPLATE))
createTemplate(templates, extensions[i]);
else if (extensions[i].getName().equals(INCLUDE)) {
readIncludedTemplates(templates, extensions[i]);
}
}
return templates;
}
private void readIncludedTemplates(Collection templates, IConfigurationElement element) throws IOException {
String file= element.getAttribute(FILE);
if (file != null) {
Bundle plugin = Platform.getBundle(element.getContributor().getName());
URL url= FileLocator.find(plugin, Path.fromOSString(file), null);
if (url != null) {
ResourceBundle bundle= null;
InputStream bundleStream= null;
InputStream stream= null;
try {
String translations= element.getAttribute(TRANSLATIONS);
if (translations != null) {
URL bundleURL= FileLocator.find(plugin, Path.fromOSString(translations), null);
if (bundleURL != null) {
bundleStream= bundleURL.openStream();
bundle= new PropertyResourceBundle(bundleStream);
}
}
stream= new BufferedInputStream(url.openStream());
TemplateReaderWriter reader= new TemplateReaderWriter();
TemplatePersistenceData[] datas= reader.read(stream, bundle);
for (int i= 0; i < datas.length; i++) {
TemplatePersistenceData data= datas[i];
if (data.isCustom()) {
if (data.getId() == null)
TextEditorPlugin.logErrorMessage(MessageFormat.format(ContributionTemplateMessages.ContributionTemplateStore_ignore_no_id, data.getTemplate().getName()));
else
TextEditorPlugin.logErrorMessage(MessageFormat.format(ContributionTemplateMessages.ContributionTemplateStore_ignore_deleted, data.getTemplate().getName()));
} else if (validateTemplate(data.getTemplate())) {
templates.add(data);
}
}
} finally {
try {
if (bundleStream != null)
bundleStream.close();
} catch (IOException x) {
} finally {
try {
if (stream != null)
stream.close();
} catch (IOException x) {
}
}
}
}
}
}
/**
* Validates a template against the context type registered in the context
* type registry. Returns always <code>true</code> if no registry is
* present.
*
* @param template the template to validate
* @return <code>true</code> if validation is successful or no context
* type registry is specified, <code>false</code> if validation
* fails
*/
private boolean validateTemplate(Template template) {
String contextTypeId= template.getContextTypeId();
if (!contextExists(contextTypeId))
return false;
if (getRegistry() != null) {
try {
getRegistry().getContextType(contextTypeId).validate(template.getPattern());
} catch (TemplateException e) {
TextEditorPlugin.log(MessageFormat.format(ContributionTemplateMessages.ContributionTemplateStore_ignore_validation_failed, template.getName()), e);
return false;
}
}
return true;
}
/**
* Returns <code>true</code> if a context type id specifies a valid context type
* or if no context type registry is present.
*
* @param contextTypeId the context type id to look for
* @return <code>true</code> if the context type specified by the id
* is present in the context type registry, or if no registry is
* specified
*/
private boolean contextExists(String contextTypeId) {
return contextTypeId != null && (getRegistry() == null || getRegistry().getContextType(contextTypeId) != null);
}
private static IConfigurationElement[] getTemplateExtensions() {
return Platform.getExtensionRegistry().getConfigurationElementsFor(TEMPLATES_EXTENSION_POINT);
}
private void createTemplate(Collection map, IConfigurationElement element) {
String contextTypeId= element.getAttribute(CONTEXT_TYPE_ID);
// log failures since extension point id and name are mandatory
if (contextExists(contextTypeId)) {
String id= element.getAttribute(ID);
if (isValidTemplateId(id)) {
String name= element.getAttribute(NAME);
if (name != null) {
String pattern= element.getChildren(PATTERN)[0].getValue();
if (pattern != null) {
String desc= element.getAttribute(DESCRIPTION);
if (desc == null)
desc= ""; //$NON-NLS-1$
String autoInsert= element.getAttribute(AUTO_INSERT);
boolean bAutoInsert;
if (autoInsert == null)
bAutoInsert= true;
else
bAutoInsert= Boolean.valueOf(autoInsert).booleanValue();
Template template= new Template(name, desc, contextTypeId, pattern, bAutoInsert);
TemplatePersistenceData data= new TemplatePersistenceData(template, true, id);
if (validateTemplate(template))
map.add(data);
}
}
}
}
}
private static boolean isValidTemplateId(String id) {
return id != null && id.trim().length() != 0; // TODO test validity?
}
/*
* @see org.eclipse.jface.text.templates.persistence.TemplateStore#handleException(java.io.IOException)
* @since 3.2
*/
protected void handleException(IOException x) {
TextEditorPlugin.log(x);
}
}