com.trenako.web.infrastructure.RangeRequestQueryParamsBuilder.java Source code

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Here is the source code for com.trenako.web.infrastructure.RangeRequestQueryParamsBuilder.java

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/*
 * Copyright 2012 the original author or authors.
 * 
 * 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.trenako.web.infrastructure;

import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.Arrays;
import java.util.Collections;
import java.util.Date;
import java.util.List;
import java.util.Map;

import org.apache.commons.lang3.time.DateFormatUtils;

import com.trenako.results.RangeRequest;
import com.trenako.results.SearchRange;

/**
 * @author Carlo Micieli
 */
public class RangeRequestQueryParamsBuilder {

    private RangeRequestQueryParamsBuilder() {
    }

    /**
     * Builds the query parameters for the provided {@code SearchRange}.
     *
     * @param searchRange the {@code SearchRange}
     * @return the query parameters
     */
    public static String buildQueryParamsNext(SearchRange searchRange) {
        try {
            return buildQueryParams(searchRange.asMap(), RangeRequest.SINCE_NAME);
        } catch (UnsupportedEncodingException e) {
            return null;
        }
    }

    /**
     * Builds the query parameters for the provided {@code SearchRange}.
     *
     * @param searchRange the {@code SearchRange}
     * @return the query parameters
     */
    public static String buildQueryParamsPrevious(SearchRange searchRange) {
        try {
            return buildQueryParams(searchRange.asMap(), RangeRequest.MAX_NAME);
        } catch (UnsupportedEncodingException e) {
            return null;
        }
    }

    /**
     * Builds the query parameters for the provided parameters {@code Map}.
     *
     * @param params the parameters
     * @param range  range id
     * @return the query parameters
     * @throws UnsupportedEncodingException
     */
    static String buildQueryParams(Map<String, Object> params, String range) throws UnsupportedEncodingException {
        StringBuilder sb = new StringBuilder();

        boolean first = true;
        for (Map.Entry<String, Object> entry : params.entrySet()) {

            if (RANGE_NAMES.contains(entry.getKey()) && !entry.getKey().equals(range)) {
                continue;
            }

            if (first) {
                sb.append("?");
                first = false;
            } else {
                sb.append("&");
            }

            String val;
            if (entry.getValue() instanceof Date) {
                val = DateFormatUtils.format((Date) entry.getValue(),
                        DateFormatUtils.ISO_DATETIME_FORMAT.getPattern());
            } else {
                val = entry.getValue().toString();
            }
            sb.append(entry.getKey()).append("=").append(URLEncoder.encode(val, "UTF-8"));
        }

        return sb.toString();
    }

    static final List<String> RANGE_NAMES = Collections
            .unmodifiableList(Arrays.asList(RangeRequest.MAX_NAME, RangeRequest.SINCE_NAME));
}