com.google.cloud.tools.eclipse.appengine.validation.XsltSourceQuickFix.java Source code

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Here is the source code for com.google.cloud.tools.eclipse.appengine.validation.XsltSourceQuickFix.java

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/*
 * Copyright 2017 Google Inc.
 *
 * 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.google.cloud.tools.eclipse.appengine.validation;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.net.URL;
import java.util.logging.Level;
import java.util.logging.Logger;

import javax.xml.transform.TransformerException;

import org.eclipse.jface.text.DocumentEvent;
import org.eclipse.jface.text.IDocument;
import org.eclipse.jface.text.ITextViewer;
import org.eclipse.jface.text.contentassist.ICompletionProposal;
import org.eclipse.jface.text.contentassist.ICompletionProposalExtension2;
import org.eclipse.jface.text.contentassist.IContextInformation;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.Point;

import com.google.cloud.tools.eclipse.util.Xslt;
import com.google.common.io.CharStreams;

/**
 * Xslt quick fix available in source editor.
 */
public class XsltSourceQuickFix implements ICompletionProposal, ICompletionProposalExtension2 {

    private static final Logger logger = Logger.getLogger(XsltSourceQuickFix.class.getName());
    private String xsltPath;
    private String message;

    public XsltSourceQuickFix(String xsltPath, String message) {
        this.xsltPath = xsltPath;
        this.message = message;
    }

    /**
     * Applies the provided XSLT style sheet to the {@link IDocument} in the source editor.
     */
    @Override
    public void apply(ITextViewer viewer, char trigger, int stateMask, int offset) {
        URL xslt = ApplicationQuickFix.class.getResource(xsltPath);
        IDocument document = viewer.getDocument();
        byte[] bytes = getDocumentBytes(document);
        try (InputStream in = new ByteArrayInputStream(bytes); InputStream stylesheetStream = xslt.openStream()) {
            InputStream transformed = Xslt.applyXslt(in, stylesheetStream);
            String encoding = AbstractXmlSourceValidator.getDocumentEncoding(document);
            String result = CharStreams.toString(new InputStreamReader(transformed, encoding));
            document.set(result);
        } catch (IOException | TransformerException ex) {
            logger.log(Level.SEVERE, ex.getMessage());
        }
    }

    @Override
    public String getDisplayString() {
        return message;
    }

    byte[] getDocumentBytes(IDocument document) {
        String encoding = AbstractXmlSourceValidator.getDocumentEncoding(document);
        try {
            byte[] bytes = document.get().getBytes(encoding);
            return bytes;
        } catch (UnsupportedEncodingException ex) {
            logger.log(Level.SEVERE, ex.getMessage());
            return new byte[0];
        }
    }

    @Override
    public boolean validate(IDocument document, int offset, DocumentEvent event) {
        return true;
    }

    @Override
    public void apply(IDocument document) {
    }

    @Override
    public Point getSelection(IDocument document) {
        return null;
    }

    @Override
    public String getAdditionalProposalInfo() {
        return null;
    }

    @Override
    public Image getImage() {
        return null;
    }

    @Override
    public IContextInformation getContextInformation() {
        return null;
    }

    @Override
    public void selected(ITextViewer viewer, boolean smartToggle) {
    }

    @Override
    public void unselected(ITextViewer viewer) {
    }

}