io.knotx.adapter.common.placeholders.RequestPlaceholderSubstitutor.java Source code

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Here is the source code for io.knotx.adapter.common.placeholders.RequestPlaceholderSubstitutor.java

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/*
 * Copyright (C) 2016 Cognifide Limited
 *
 * 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.knotx.adapter.common.placeholders;

import io.knotx.dataobjects.ClientRequest;
import java.util.Arrays;
import org.apache.commons.lang3.StringUtils;

public class RequestPlaceholderSubstitutor implements PlaceholderSubstitutor {

    @Override
    public String getValue(final ClientRequest request, final String placeholder) {
        return Arrays.stream(Strategy.values())
                .filter(strategy -> StringUtils.startsWith(placeholder, strategy.prefix)).findFirst()
                .map(strategy -> strategy.getValue(request, placeholder)).orElse(null);
    }

    private enum Strategy {

        HEADER("header.") {
            @Override
            String getValue(ClientRequest request, String placeholder) {
                return request.getHeaders().get(getName(placeholder));
            }
        },
        PARAM("param.") {
            @Override
            String getValue(ClientRequest request, String placeholder) {
                return request.getParams().get(getName(placeholder));
            }
        };

        final String prefix;

        Strategy(String prefix) {
            this.prefix = prefix;
        }

        String getName(String placeholder) {
            return StringUtils.substringAfter(placeholder, ".");
        }

        abstract String getValue(ClientRequest request, String placeholder);
    }

}