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/******************************************************************************
* Copyright (c) 2008, 2020 Borland Software Corporation, CEA LIST, Artal
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* Boris Blajer (Borland)
* Aurelien Didier (ARTAL) - aurelien.didier51@gmail.com - Bug 569174
*****************************************************************************/
package org.eclipse.papyrus.gmf.internal.xpand.model;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import org.eclipse.papyrus.gmf.internal.xpand.StreamsHolder;
/**
* Holder for named streams.
*/
public class XpandStreamsHolder implements StreamsHolder {
private HashMap<String, StringBuilder> myStreams;
private HashSet<String> myStreamsAccessed;
public String getStreamContents(String slotName) {
if (myStreams == null) {
throw new EvaluationException("Undefined stream " + slotName);
}
StringBuilder result = myStreams.get(slotName);
if (result == null) {
throw new EvaluationException("Undefined stream " + slotName);
}
setAccessed(slotName);
if (result.length() == 0) {
return null;
}
return result.toString();
}
public List<String> getSlotNames() {
if (myStreams == null) {
return Collections.emptyList();
}
//Filter streams that have no content
ArrayList<String> result = new ArrayList<String>(myStreams.size());
for (Map.Entry<String, StringBuilder> next : myStreams.entrySet()) {
if (next.getValue().length() == 0) {
continue;
}
result.add(next.getKey());
}
return Collections.unmodifiableList(result);
}
public void addNamedStream(String name, StringBuilder stream) {
if (myStreams == null) {
myStreams = new HashMap<String, StringBuilder>();
}
assert !myStreams.containsKey(name);
myStreams.put(name, stream);
}
private void setAccessed(String slotName) {
if (myStreamsAccessed == null) {
myStreamsAccessed = new HashSet<String>();
}
myStreamsAccessed.add(slotName);
}
public boolean isAccessed(String slotName) {
return myStreamsAccessed != null && myStreamsAccessed.contains(slotName);
}
}
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