org.sonar.javascript.cfg.ForwardingBlock.java Source code

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Here is the source code for org.sonar.javascript.cfg.ForwardingBlock.java

Source

/*
 * SonarQube JavaScript Plugin
 * Copyright (C) 2011-2016 SonarSource SA
 * mailto:contact 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 java.util.Map;
import org.sonar.plugins.javascript.api.tree.Tree;

import com.google.common.base.Preconditions;

/**
 * A {@link MutableBlock} 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 ForwardingBlock extends SingleSuccessorBlock {

    private MutableBlock successor;

    @Override
    public MutableBlock successor() {
        Preconditions.checkState(successor != null, "No successor was set on " + this);
        return successor;
    }

    @Override
    public void replaceSuccessors(Map<MutableBlock, MutableBlock> replacements) {
        this.successor = replacement(this.successor, replacements);
    }

    public void setSuccessor(MutableBlock successor) {
        this.successor = successor;
    }

    @Override
    public void addElement(Tree element) {
        throw new UnsupportedOperationException("Cannot add an element to a forwarding block");
    }

}