AlloyContentDescriberForJSP.java example

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/*******************************************************************************
 * Copyright (c) 2000-present Liferay, Inc. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License as published by the Free
 * Software Foundation; either version 2.1 of the License, or (at your option)
 * any later version.
 *
 * This library is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
 * details.
 *
 *******************************************************************************/
package com.liferay.ide.alloy.core.jsp;

import com.liferay.ide.core.LiferayNature;
import com.liferay.ide.core.util.CoreUtil;
import com.liferay.ide.project.core.util.ProjectUtil;

import java.io.IOException;
import java.io.InputStream;
import java.io.Reader;
import java.lang.reflect.Field;

import org.eclipse.core.filesystem.IFileStore;
import org.eclipse.core.resources.IFile;
import org.eclipse.core.runtime.ListenerList;
import org.eclipse.core.runtime.QualifiedName;
import org.eclipse.core.runtime.content.IContentDescription;
import org.eclipse.core.runtime.content.ITextContentDescriber;
import org.eclipse.jst.jsp.core.internal.contenttype.ContentDescriberForJSP;
import org.eclipse.jst.jsp.core.internal.provisional.contenttype.IContentDescriptionForJSP;
import org.eclipse.wst.sse.core.internal.encoding.IContentDescriptionExtended;


/**
 * @author Gregory Amerson
 */
@SuppressWarnings( "restriction" )
public class AlloyContentDescriberForJSP implements ITextContentDescriber
{
    private final static QualifiedName[] SUPPORTED_OPTIONS =
    {
        IContentDescription.CHARSET,
        IContentDescription.BYTE_ORDER_MARK,
        IContentDescriptionExtended.DETECTED_CHARSET,
        IContentDescriptionExtended.UNSUPPORTED_CHARSET,
        IContentDescriptionExtended.APPROPRIATE_DEFAULT,
        IContentDescriptionForJSP.CONTENT_TYPE_ATTRIBUTE,
        IContentDescriptionForJSP.LANGUAGE_ATTRIBUTE,
        IContentDescriptionForJSP.CONTENT_FAMILY_ATTRIBUTE
    };

    @Override
    public int describe( InputStream contents, IContentDescription description ) throws IOException
    {
        int retval = new ContentDescriberForJSP().describe( contents, description );

        try
        {
            final Field inputStreamField = contents.getClass().getDeclaredField( "in" );
            inputStreamField.setAccessible( true );

            final InputStream inputStream = (InputStream) inputStreamField.get( contents );
            final Field fileStoreField = inputStream.getClass().getDeclaredField( "target" );
            fileStoreField.setAccessible( true );

            final IFileStore fileStore = (IFileStore) fileStoreField.get( inputStream );

            if( fileStore != null )
            {
                final IFile[] files = CoreUtil.getWorkspaceRoot().findFilesForLocationURI( fileStore.toURI() );

                for( IFile file : files )
                {
                    if( ProjectUtil.isPortletProject( file.getProject() ) ||
                        LiferayNature.hasNature( file.getProject() ) )
                    {
                        return VALID;
                    }
                }
            }
        }
        catch( Exception e )
        {
            // ignore errors
        }

        return retval;
    }

    @Override
    public int describe( Reader contents, IContentDescription description ) throws IOException
    {
        int retval = new ContentDescriberForJSP().describe( contents, description );

        try
        {
            final Field documentReaderField = contents.getClass().getDeclaredField( "in" );
            documentReaderField.setAccessible( true );

            final Object documentReader = documentReaderField.get( contents );
            final Field fDocumentField = documentReader.getClass().getDeclaredField( "fDocument" );
            fDocumentField.setAccessible( true );

            final Object fDocument = fDocumentField.get( documentReader );
            final Field fDocumentListenersField =
                fDocument.getClass().getSuperclass().getSuperclass().getDeclaredField( "fDocumentListeners" );
            fDocumentListenersField.setAccessible( true );

            final ListenerList fDocumentListeners = (ListenerList) fDocumentListenersField.get( fDocument );
            final Object[] listeners = fDocumentListeners.getListeners();

            for( Object listener : listeners )
            {
                try
                {
                    final Field fFileField =
                        listener.getClass().getEnclosingClass().getSuperclass().getDeclaredField( "fFile" );
                    fFileField.setAccessible( true );

                    // get enclosing instance of listener
                    final Field thisField = listener.getClass().getDeclaredField( "this$0" );
                    thisField.setAccessible( true );

                    Object enclosingObject = thisField.get( listener );
                    Object fFile = fFileField.get( enclosingObject );

                    if( fFile instanceof IFile )
                    {
                        IFile file = (IFile) fFile;

                        if( ProjectUtil.isPortletProject( file.getProject() ) ||
                                        LiferayNature.hasNature( file.getProject() ) )
                        {
                            return VALID;
                        }
                    }
                }
                catch( Exception e )
                {
                }
            }
        }
        catch ( Exception e )
        {
            // ignore errors
        }

        return retval;
    }

    @Override
    public QualifiedName[] getSupportedOptions()
    {
        return SUPPORTED_OPTIONS;
    }

}