io.apicurio.datamodels.core.util.LocalReferenceResolver Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of data-models-test Show documentation
Open Source API Design Studio
There is a newer version: 3.5.0.Final
/*
 * Copyright 2019 Red Hat
 *
 * 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 io.apicurio.datamodels.core.util;

import java.util.List;

import io.apicurio.datamodels.compat.NodeCompat;
import io.apicurio.datamodels.compat.RegexCompat;
import io.apicurio.datamodels.core.models.IIndexedNode;
import io.apicurio.datamodels.core.models.Node;

/**
 * A class to help with resolving references.  Handles recursion with loop detection.
 * @author [email protected]
 */
public class LocalReferenceResolver implements IReferenceResolver {

    /**
     * @see io.apicurio.datamodels.core.util.IReferenceResolver#resolveRef(java.lang.String, io.apicurio.datamodels.core.models.Node)
     */
    @SuppressWarnings("rawtypes")
    @Override
    public Node resolveRef(String $ref, Node from) {
        // Only handle internal $refs
        if ($ref == null || $ref.indexOf("#/") != 0) {
            return null;
        }
        
        // TODO support escaped chars in JSON refs
        // TODO implement a proper reference resolver including external file resolution: https://github.com/EricWittmann/oai-ts-core/issues/8
        List split = RegexCompat.findMatches($ref, "([^/]+)/?");
        Object cnode = null;
        for (String[] mi : split) {
            String seg = mi[1];
            if (NodeCompat.equals(seg, "#")) {
                cnode = from.ownerDocument();
            } else if (cnode != null) {
                if (cnode instanceof IIndexedNode) {
                    cnode = ((IIndexedNode) cnode).getItem(seg);
                } else {
                    cnode = NodeCompat.getProperty(cnode, seg);
                }
            }
        }
        
        if (cnode instanceof Node) {
            return (Node) cnode;
        } else {
            return null;
        }

//        try {
//            // Not found?  Return null.
//            if (cnode == null) {
//                return null;
//            }
//    
//            // If cnode itself has a $ref, then keep looking!
//            String another$ref = (String) NodeCompat.getProperty(cnode, Constants.PROP_$REF);
//            if (another$ref != null) {
//                return ReferenceUtil.resolveRef(another$ref, from);
//            } else {
//                return (Node) cnode;
//            }
//        } catch (Throwable t) {
//            return null;
//        }
    }
}