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ph-oton basic application stuff
/*
* Copyright (C) 2014-2021 Philip Helger (www.helger.com)
* philip[at]helger[dot]com
*
* 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.
*/
package com.helger.photon.app.html;
import java.util.Collection;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import javax.annotation.concurrent.ThreadSafe;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.helger.commons.ValueEnforcer;
import com.helger.commons.annotation.ReturnsMutableCopy;
import com.helger.commons.collection.impl.CommonsLinkedHashSet;
import com.helger.commons.collection.impl.ICommonsOrderedSet;
import com.helger.commons.concurrent.SimpleLock;
import com.helger.commons.io.resource.IReadableResource;
import com.helger.commons.string.StringHelper;
import com.helger.html.js.JSFilenameHelper;
import com.helger.html.resource.IHTMLResourceProvider;
import com.helger.html.resource.js.ConstantJSPathProvider;
import com.helger.html.resource.js.IJSPathProvider;
import com.helger.photon.app.PhotonAppSettings;
import com.helger.web.scope.IRequestWebScopeWithoutResponse;
import com.helger.web.scope.mgr.WebScopeManager;
import com.helger.xml.microdom.IMicroDocument;
import com.helger.xml.microdom.IMicroElement;
import com.helger.xml.microdom.serialize.MicroReader;
/**
* This class keeps track of all the JS files that must be included globally for
* a single request.
*
* @author Philip Helger
*/
@ThreadSafe
public final class PhotonJS
{
public static final String DEFAULT_FILENAME = "html/js.xml";
private static final String REQUEST_ATTR_JSRESOURCES = PhotonJS.class.getName ();
private static final Logger LOGGER = LoggerFactory.getLogger (PhotonJS.class);
private static final JSResourceSet s_aGlobal = new JSResourceSet ();
private static final SimpleLock s_aLock = new SimpleLock ();
private PhotonJS ()
{}
public static void _readJSIncludes (@Nonnull final IReadableResource aRes, @Nonnull final JSResourceSet aTarget)
{
ValueEnforcer.notNull (aRes, "Res");
ValueEnforcer.notNull (aTarget, "Target");
final IMicroDocument aDoc = aRes.exists () ? MicroReader.readMicroXML (aRes) : null;
if (aDoc != null)
for (final IMicroElement eChild : aDoc.getDocumentElement ().getAllChildElements ("js"))
{
final String sPath = eChild.getAttributeValue ("path");
if (StringHelper.hasNoText (sPath))
{
LOGGER.error ("Found JS item without a path in " + aRes.getPath ());
continue;
}
// Just a consistency check to see if the resource is valid
final IReadableResource aChildRes = PhotonAppSettings.getURIToURLConverter ().getAsResource (sPath);
if (!aChildRes.exists ())
throw new IllegalStateException ("The provided global JS resource '" +
sPath +
"' resolved to '" +
aChildRes +
"' does NOT exist!");
final String sConditionalComment = eChild.getAttributeValue ("condcomment");
// Add to target
aTarget.addItem (new ConstantJSPathProvider (sPath,
JSFilenameHelper.getMinifiedJSFilename (sPath),
sConditionalComment,
IHTMLResourceProvider.DEFAULT_IS_BUNDLABLE));
}
}
public static void readJSIncludesForGlobal (@Nonnull final IReadableResource aRes)
{
_readJSIncludes (aRes, s_aGlobal);
}
/**
* Register a new JS item for global scope.
*
* @param aJSPathProvider
* The JS path provider to use. May not be null.
*/
public static void registerJSIncludeForGlobal (@Nonnull final IJSPathProvider aJSPathProvider)
{
s_aGlobal.addItem (aJSPathProvider);
}
/**
* Register a new JS item for global scope.
*
* @param nIndex
* The index to be used. If the value is < 0 the value is ignored
* and item is appended.
* @param aJSPathProvider
* The JS path provider to use. May not be null.
*/
public static void registerJSIncludeForGlobal (final int nIndex, @Nonnull final IJSPathProvider aJSPathProvider)
{
s_aGlobal.addItem (nIndex, aJSPathProvider);
}
/**
* Unregister an existing JS item for global scope.
*
* @param aJSPathProvider
* The JS path provider to use. May not be null.
*/
public static void unregisterJSIncludeForGlobal (@Nonnull final IJSPathProvider aJSPathProvider)
{
s_aGlobal.removeItem (aJSPathProvider);
}
/**
* Unregister all existing JS items from global scope.
*/
public static void unregisterAllJSIncludesFromGlobal ()
{
s_aGlobal.removeAll ();
}
/**
* @return A non-null set with all JS paths to be included
* globally.
*/
@Nonnull
@ReturnsMutableCopy
public static ICommonsOrderedSet getAllRegisteredJSIncludesForGlobal ()
{
return s_aGlobal.getAllItems ();
}
public static void getAllRegisteredJSIncludesForGlobal (@Nonnull final Collection aTarget)
{
s_aGlobal.getAllItems (aTarget);
}
/**
* @return true if at least a single JS path has been registered
* globally.
*/
public static boolean hasRegisteredJSIncludesForGlobal ()
{
return s_aGlobal.isNotEmpty ();
}
@Nullable
private static JSResourceSet _getPerRequestSet (final boolean bCreateIfNotExisting)
{
final IRequestWebScopeWithoutResponse aRequestScope = WebScopeManager.getRequestScope ();
return s_aLock.lockedGet ( () -> {
JSResourceSet ret = aRequestScope.attrs ().getCastedValue (REQUEST_ATTR_JSRESOURCES);
if (ret == null && bCreateIfNotExisting)
{
ret = new JSResourceSet ();
aRequestScope.attrs ().putIn (REQUEST_ATTR_JSRESOURCES, ret);
}
return ret;
});
}
/**
* Register a new JS item only for this request
*
* @param aJSPathProvider
* The JS path provider to use. May not be null.
*/
public static void registerJSIncludeForThisRequest (@Nonnull final IJSPathProvider aJSPathProvider)
{
_getPerRequestSet (true).addItem (aJSPathProvider);
}
/**
* Unregister a existing JS item only from this request
*
* @param aJSPathProvider
* The JS path provider to use. May not be null.
*/
public static void unregisterJSIncludeFromThisRequest (@Nonnull final IJSPathProvider aJSPathProvider)
{
final JSResourceSet aSet = _getPerRequestSet (false);
if (aSet != null)
aSet.removeItem (aJSPathProvider);
}
/**
* Unregister all existing JS items from this request
*/
public static void unregisterAllJSIncludesFromThisRequest ()
{
final JSResourceSet aSet = _getPerRequestSet (false);
if (aSet != null)
aSet.removeAll ();
}
/**
* @return A non-null set with all JS paths to be included in
* this request.
*/
@Nonnull
@ReturnsMutableCopy
public static ICommonsOrderedSet getAllRegisteredJSIncludesForThisRequest ()
{
final JSResourceSet aSet = _getPerRequestSet (false);
if (aSet == null)
return new CommonsLinkedHashSet <> ();
aSet.markAsCollected ();
return aSet.getAllItems ();
}
public static void getAllRegisteredJSIncludesForThisRequest (@Nonnull final Collection aTarget)
{
final JSResourceSet aSet = _getPerRequestSet (false);
if (aSet != null)
{
aSet.markAsCollected ();
aSet.getAllItems (aTarget);
}
}
/**
* @return true if at least a single JS path has been registered
* for this request only
*/
public static boolean hasRegisteredJSIncludesForThisRequest ()
{
final JSResourceSet aSet = _getPerRequestSet (false);
return aSet != null && aSet.isNotEmpty ();
}
}