org.elasticsearch.test.rest.yaml.ObjectPath Maven / Gradle / Ivy

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/*
 * Licensed to Elasticsearch under one or more contributor
 * license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright
 * ownership. Elasticsearch licenses this file to you 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.elasticsearch.test.rest.yaml;

import org.apache.http.util.EntityUtils;
import org.elasticsearch.client.Response;
import org.elasticsearch.common.bytes.BytesArray;
import org.elasticsearch.common.bytes.BytesReference;
import org.elasticsearch.common.xcontent.NamedXContentRegistry;
import org.elasticsearch.common.xcontent.XContent;
import org.elasticsearch.common.xcontent.XContentParser;
import org.elasticsearch.common.xcontent.XContentType;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

/**
 * Holds an object and allows to extract specific values from it given their path
 */
public class ObjectPath {

    private final Object object;

    public static ObjectPath createFromResponse(Response response) throws IOException {
        byte[] bytes = EntityUtils.toByteArray(response.getEntity());
        String contentType = response.getHeader("Content-Type");
        XContentType xContentType = XContentType.fromMediaTypeOrFormat(contentType);
        return ObjectPath.createFromXContent(xContentType.xContent(), new BytesArray(bytes));
    }

    public static ObjectPath createFromXContent(XContent xContent, BytesReference input) throws IOException {
        try (XContentParser parser = xContent.createParser(NamedXContentRegistry.EMPTY, input)) {
            if (parser.nextToken() == XContentParser.Token.START_ARRAY) {
                return new ObjectPath(parser.listOrderedMap());
            }
            return new ObjectPath(parser.mapOrdered());
        }
    }

    public ObjectPath(Object object) {
        this.object = object;
    }

    /**
     * Returns the object corresponding to the provided path if present, null otherwise
     */
    public Object evaluate(String path) throws IOException {
        return evaluate(path, Stash.EMPTY);
    }

    /**
     * Returns the object corresponding to the provided path if present, null otherwise
     */
    public Object evaluate(String path, Stash stash) throws IOException {
        String[] parts = parsePath(path);
        Object object = this.object;
        for (String part : parts) {
            object = evaluate(part, object, stash);
            if (object == null) {
                return null;
            }
        }
        return object;
    }

    @SuppressWarnings("unchecked")
    private Object evaluate(String key, Object object, Stash stash) throws IOException {
        if (stash.containsStashedValue(key)) {
            key = stash.getValue(key).toString();
        }

        if (object instanceof Map) {
            return ((Map) object).get(key);
        }
        if (object instanceof List) {
            List