org.sourcepit.ltk.parser.AbstractParseNode.java Source code

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Here is the source code for org.sourcepit.ltk.parser.AbstractParseNode.java

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/*
 * Copyright 2015 Bernd Vogt and others.
 * 
 * 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 org.sourcepit.ltk.parser;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import org.antlr.v4.runtime.Token;

public abstract class AbstractParseNode implements ParseNode {
    private final Rule parent;

    private final List<ParseNode> children;

    private final Terminal origin;

    private final List<Object> adapters = new ArrayList<>();

    public AbstractParseNode(Rule parent, List<ParseNode> children, Terminal origin) {
        this.parent = parent;
        this.children = Collections.unmodifiableList(children);
        this.origin = origin;
    }

    @SuppressWarnings("unchecked")
    @Override
    public <A> A getAdapter(Class<A> adapterType) {
        for (Object object : adapters) {
            if (adapterType.isAssignableFrom(object.getClass())) {
                return (A) adapterType;
            }
        }
        return null;
    }

    @Override
    public List<?> getAdapters() {
        return adapters;
    }

    @Override
    public boolean isRoot() {
        return parent == null;
    }

    @Override
    public Rule getParent() {
        return parent;
    }

    @Override
    public List<ParseNode> getChildren() {
        return children;
    }

    public List<ParseNode> getVisibleChildren() {
        final List<ParseNode> visibleChildren = new ArrayList<>();
        for (ParseNode child : getChildren()) {
            if (child.isRule() || ((Terminal) child).getToken().getChannel() == Token.DEFAULT_CHANNEL) {
                visibleChildren.add(child);
            }
        }
        return visibleChildren;
    }

    @Override
    public boolean isNestedLanguage() {
        return origin != null;
    }

    @Override
    public Terminal getOrigin() {
        return origin;
    }

}