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/*******************************************************************************
* Copyright (c) 2016-2017 Red Hat Inc. and others.
* 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:
* - Mickael Istria (Red Hat Inc.)
*******************************************************************************/
package org.eclipse.ui.internal.genericeditor.hover;
import java.util.ArrayList;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Objects;
import java.util.stream.Collectors;
import org.eclipse.core.runtime.Assert;
import org.eclipse.jface.text.IInformationControlCreator;
import org.eclipse.jface.text.IRegion;
import org.eclipse.jface.text.ITextHover;
import org.eclipse.jface.text.ITextHoverExtension;
import org.eclipse.jface.text.ITextHoverExtension2;
import org.eclipse.jface.text.ITextViewer;
import org.eclipse.jface.text.Region;
/**
* A text hover that delegates its operations to children
* provided in constructor and returns the first interesting result.
*
* @since 1.0
*/
public class CompositeTextHover implements ITextHover, ITextHoverExtension, ITextHoverExtension2 {
private final List<ITextHover> allHovers;
private LinkedHashMap<ITextHover, IRegion> regions = null;
private LinkedHashMap<ITextHover, Object> currentHovers = null;
public CompositeTextHover(List<ITextHover> hoversToConsider) {
Assert.isNotNull(hoversToConsider);
Assert.isLegal(hoversToConsider.size() > 1, "Do not compose a single hover."); //$NON-NLS-1$
this.allHovers = Collections.unmodifiableList(hoversToConsider);
}
@Override
public Object getHoverInfo2(ITextViewer textViewer, IRegion requestRegion) {
this.currentHovers = new LinkedHashMap<>();
for (ITextHover hover : this.allHovers) {
IRegion currentRegion = this.regions.get(hover);
if (currentRegion == null) {
continue;
}
Object res = hover instanceof ITextHoverExtension2 ?
((ITextHoverExtension2)hover).getHoverInfo2(textViewer, currentRegion) :
hover.getHoverInfo(textViewer, currentRegion);
if (res != null) {
this.currentHovers.put(hover, res);
}
}
if (this.currentHovers.isEmpty()) {
return null;
} else if (this.currentHovers.size() == 1) {
return this.currentHovers.values().iterator().next();
} else {
return this.currentHovers;
}
}
@Override
public IInformationControlCreator getHoverControlCreator() {
if (this.currentHovers == null || this.currentHovers.isEmpty()) {
return null;
} else if (currentHovers.size() == 1) {
ITextHover hover = this.currentHovers.keySet().iterator().next();
return hover instanceof ITextHoverExtension ?
((ITextHoverExtension)hover).getHoverControlCreator():
null;
} else {
return new CompositeInformationControlCreator(new ArrayList<>(this.currentHovers.keySet()));
}
}
@Override
public String getHoverInfo(ITextViewer textViewer, IRegion hoverRegion) {
return this.allHovers.stream()
.map(hover -> hover.getHoverInfo(textViewer, this.regions.get(hover)))
.filter(Objects::nonNull)
.collect(Collectors.joining("\n")); //$NON-NLS-1$
}
@Override
public IRegion getHoverRegion(ITextViewer textViewer, int offset) {
this.regions = new LinkedHashMap<>();
IRegion res = null;
for (ITextHover hover : this.allHovers) {
IRegion region = hover.getHoverRegion(textViewer, offset);
if (region != null) {
this.regions.put(hover, region);
if (res == null) {
res = region;
} else {
int startOffset = Math.max(res.getOffset(), region.getOffset());
int endOffset = Math.min(res.getOffset() + res.getLength(), region.getOffset() + region.getLength());
res = new Region(startOffset, endOffset - startOffset);
}
}
}
return res;
}
}
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