org.sonar.javascript.cfg.JsCfgForwardingBlock Maven / Gradle / Ivy
/*
* SonarQube JavaScript Plugin
* Copyright (C) 2011-2018 SonarSource SA
* mailto:info AT sonarsource DOT com
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 3 of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
package org.sonar.javascript.cfg;
import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableSet;
import java.util.Map;
import org.sonar.plugins.javascript.api.tree.Tree;
/**
* A {@link JsCfgBlock} which has exactly one successor and which has no element.
* This is used only to build some special flows, e.g. an infinite {@code for} loop.
*/
class JsCfgForwardingBlock extends JsCfgBlock {
private JsCfgBlock successor;
@Override
public ImmutableSet successors() {
Preconditions.checkState(successor != null, "No successor was set on %s", this);
return ImmutableSet.of(successor);
}
@Override
public void addElement(Tree element) {
throw new UnsupportedOperationException("Cannot add an element to a forwarding block");
}
void setSuccessor(JsCfgBlock successor) {
this.successor = successor;
}
@Override
public void replaceSuccessors(Map replacements) {
this.successor = replacement(successor, replacements);
}
}