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A web service test double for all occasions

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/*
 * Copyright (C) 2011 Thomas Akehurst
 *
 * 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 com.github.tomakehurst.wiremock.matching;

import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonDeserializer;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.JsonNode;
import com.google.common.collect.ImmutableList;

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

public class ContentPatternDeserialiser extends JsonDeserializer> {

    @Override
    public ContentPattern deserialize(JsonParser parser, DeserializationContext context) throws IOException, JsonProcessingException {
        JsonNode rootNode = parser.readValueAsTree();

        if (isAbsent(rootNode)) {
            return StringValuePattern.ABSENT;
        }

        if (!rootNode.has("binaryEqualTo")) {
            return new StringValuePatternJsonDeserializer().buildStringValuePattern(rootNode);
        }

        return deserializeBinaryEqualTo(rootNode);
    }

    private BinaryEqualToPattern deserializeBinaryEqualTo(JsonNode rootNode) throws JsonMappingException {
        String operand = rootNode.findValue("binaryEqualTo").textValue();

        return new BinaryEqualToPattern(operand);
    }

    private static boolean isAbsent(JsonNode rootNode) {
        for (Map.Entry node: ImmutableList.copyOf(rootNode.fields())) {
            if (node.getKey().equals("absent")) {
                return true;
            }
        }

        return false;
    }
}