/*
* Copyright 2003-2011 JetBrains s.r.o.
*
* 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 jetbrains.mps.smodel.persistence.def;
import java.util.Map;
public abstract class IHashProvider {
public abstract String getHash(String content);
public abstract Map<String, String> getRootHashes(String content);
protected static String extractId(String tag) {
if (tag == null) return null;
String idString = " id=\"";
int index = tag.lastIndexOf(idString);
if (index < 0) return null;
int offset = index + idString.length();
index = offset;
while (index < tag.length() && Character.isDigit(tag.codePointAt(index))) {
index++;
}
if (index < tag.length() && tag.charAt(index) == '"') return tag.substring(offset, index);
return null;
}
}