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

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Here is the source code for com.trenako.web.infrastructure.SearchCriteriaUrlBuilder.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 org.apache.commons.beanutils.BeanUtils;
import org.apache.commons.lang3.tuple.Pair;

import com.trenako.criteria.Criteria;
import com.trenako.criteria.SearchCriteria;
import com.trenako.values.LocalizedEnum;

/**
 * It represents a Url builder for {@code SearchCriteria}.
 *
 * @author Carlo Micieli
 */
public class SearchCriteriaUrlBuilder {

    private SearchCriteriaUrlBuilder() {
        throw new UnsupportedOperationException();
    }

    /**
     * Builds the context path for the provided {@code SearchCriteria}.
     *
     * @param sc the {@code SearchCriteria}
     * @return the context path
     */
    public static String buildUrl(SearchCriteria sc) {
        return buildInternal(sc, null, null, null);
    }

    public static String buildUrlAdding(SearchCriteria sc, String criteriaName, Object obj) {
        return buildInternal(sc, criteriaName, obj, null);
    }

    public static String buildUrlRemoving(SearchCriteria sc, String criteriaName) {
        return buildInternal(sc, null, null, criteriaName);
    }

    private static String buildInternal(SearchCriteria sc, String addedCriteriaName, Object addedObj,
            String removedCriteriaName) {

        StringBuilder sb = new StringBuilder();

        sb.append("/rs");

        String newValue;
        for (Criteria criteria : SearchCriteria.KEYS) {
            // added/replace a criterion with the provided value
            if (addedCriteriaName != null && addedCriteriaName.equals(criteria.criterionName())) {
                newValue = extractValue(addedObj);
                append(sb, addedCriteriaName, newValue);
            }
            // remove the criterion
            else if (removedCriteriaName != null && removedCriteriaName.equals(criteria.criterionName())) {
                continue;
            } else {
                append(sc, sb, criteria);
            }
        }

        return sb.toString();
    }

    private static String extractValue(Object obj) {
        String val;
        if (obj.getClass().equals(String.class)) {
            // don't use reflection for strings
            return obj.toString();
        } else if (obj.getClass().isEnum()) {
            val = safeGetProperty(obj, "label");
        } else if (obj.getClass().equals(LocalizedEnum.class)) {
            LocalizedEnum<?> le = (LocalizedEnum<?>) obj;
            val = le.getKey();
        } else {
            val = safeGetProperty(obj, "slug");
        }

        return val;
    }

    private static String safeGetProperty(Object bean, String propertyName) {
        String val;
        try {
            val = BeanUtils.getProperty(bean, propertyName);
        } catch (Exception e) {
            val = bean.toString();
        }

        return val;
    }

    private static void append(SearchCriteria sc, StringBuilder sb, Criteria criterion) {
        String criteriaName = criterion.criterionName();
        Pair<String, String> criteria = sc.get(criterion);
        if (criteria == null)
            return;

        sb.append("/").append(criteriaName).append("/").append(criteria.getKey());
    }

    private static void append(StringBuilder sb, String criteriaName, String criteriaValue) {
        sb.append("/").append(criteriaName).append("/").append(criteriaValue);
    }
}