com.sourceclear.headlines.util.HeaderBuilder.java Source code

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Here is the source code for com.sourceclear.headlines.util.HeaderBuilder.java

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/*
  Copyright (c) 2014  SourceClear Inc.
      
  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.sourceclear.headlines.util;

import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;

public class HeaderBuilder {

    private HeaderBuilder() {

    }

    public static String formatDirectives(ImmutableMap<String, ImmutableList<String>> directives) {

        // In the case of an empty map return the empty string:
        if (directives.isEmpty()) {
            return "";
        }

        StringBuilder sb = new StringBuilder();

        // Outer loop - loop through each directive
        for (String directive : directives.keySet()) {

            // Don't add a directive if it has zero elements
            if (directives.get(directive).size() == 0) {
                continue;
            }

            StringBuilder elements = new StringBuilder();

            // Inner loop = for each directive build up the element String
            for (String element : directives.get(directive)) {
                elements.append(element).append(" ");
            }

            if (sb.length() > 0) {
                sb.append("; ");
            }

            sb.append(directive).append(" ").append(elements.append(" ").toString());
        }

        return sb.toString().trim();
    }

    /**
     * @param values - list of String attribute values
     * @return formatted values
     */
    public static String formatListAttributeValues(ImmutableList<String> values) {

        // In the case of an empty map return the empty string:
        if (values.isEmpty()) {
            return "";
        }

        StringBuilder sb = new StringBuilder();

        // Outer loop - loop through each directive
        for (int i = 0; i < values.size(); i++) {

            // Don't add a directive if it has zero elements
            if (values.size() == 0) {
                continue;
            }

            //adding value of header attributes
            sb.append("'").append(values.get(i)).append("'");

            // adding comma if list value isn't last
            if (values.size() > 1 && i < values.size() - 1) {
                sb.append(",");
            }
        }

        return sb.toString().trim();
    }

}