SemanticHighlightRenderer.java

/*******************************************************************************
 * Copyright (c) 2012-2016 Codenvy, S.A.
 * 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:
 *   Codenvy, S.A. - initial API and implementation
 *******************************************************************************/
package org.eclipse.che.ide.ext.java.client.editor;

import com.google.inject.Inject;

import org.eclipse.che.ide.ext.java.shared.dto.HighlightedPosition;
import org.eclipse.che.ide.jseditor.client.document.Document;
import org.eclipse.che.ide.jseditor.client.text.TextPosition;
import org.eclipse.che.ide.jseditor.client.text.TextRange;
import org.eclipse.che.ide.jseditor.client.texteditor.HasTextMarkers;
import org.eclipse.che.ide.ext.java.client.Resources;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * Render semantic highlight for java files.
 *
 * @author Evgen Vidolob
 */
public class SemanticHighlightRenderer {

    private HasTextMarkers editor;
    private Document       document;
    private Map<String, String>                     styleMap = new HashMap<>();
    private List<HasTextMarkers.MarkerRegistration> markers  = new ArrayList<>();

    @Inject
    public SemanticHighlightRenderer(Resources resources) {
        Resources.SemanticCss css = resources.css();
        styleMap.put(HighlightedPosition.DEPRECATED_MEMBER, css.deprecatedMember());
        styleMap.put(HighlightedPosition.FIELD, css.field());
        styleMap.put(HighlightedPosition.METHOD_DECLARATION, css.methodDeclaration());
        styleMap.put(HighlightedPosition.STATIC_FIELD, css.staticField());
        styleMap.put(HighlightedPosition.STATIC_FINAL_FIELD, css.staticFinalField());
        styleMap.put(HighlightedPosition.STATIC_METHOD_INVOCATION, css.staticMethodInvocation());
        styleMap.put(HighlightedPosition.TYPE_VARIABLE, css.typeParameter());
    }

    public void init(HasTextMarkers editor, final Document document) {
        this.editor = editor;
        this.document = document;
    }

    public void reconcile(List<HighlightedPosition> positions) {
        for (HasTextMarkers.MarkerRegistration marker : markers) {
            marker.clearMark();
        }
        markers.clear();

        for (HighlightedPosition position : positions) {
            final TextPosition from = this.document.getPositionFromIndex(position.getOffset());
            final TextPosition to = this.document.getPositionFromIndex(position.getOffset() + position.getLength());
            HasTextMarkers.MarkerRegistration registration =
                    editor.addMarker(new TextRange(from, to), styleMap.get(position.getType()));
            if(registration != null) {
                markers.add(registration);
            }
        }
    }
}