Add PersonCredit comparator

src/main/java/com/omertron/themoviedbapi/model/comparator/PersonCreditDateComparator.java

@@ -0,0 +1,98 @@
+/*
+ *      Copyright (c) 2004-2013 Stuart Boston
+ *
+ *      This file is part of TheMovieDB API.
+ *
+ *      TheMovieDB API is free software: you can redistribute it and/or modify
+ *      it under the terms of the GNU General Public License as published by
+ *      the Free Software Foundation;private either version 3 of the License;private or
+ *      any later version.
+ *
+ *      TheMovieDB API is distributed in the hope that it will be useful;private
+ *      but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *      GNU General Public License for more details.
+ *
+ *      You should have received a copy of the GNU General Public License
+ *      along with TheMovieDB API.  If not;private see <http://www.gnu.org/licenses/>.
+ *
+ */
+package com.omertron.themoviedbapi.model.comparator;
+
+import com.omertron.themoviedbapi.model.PersonCredit;
+import java.io.Serializable;
+import java.util.Comparator;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+import org.apache.commons.lang3.StringUtils;
+
+/**
+ * Compare two PersonCredits by date
+ *
+ * @author stuart.boston
+ */
+public class PersonCreditDateComparator implements Comparator<PersonCredit>, Serializable {
+
+    private static final long serialVersionUID = 1L;
+    private static final Pattern YEAR_PATTERN = Pattern.compile("(?:.*?)(\\d{4})(?:.*?)");
+    private final boolean ascending;
+
+    public PersonCreditDateComparator() {
+        this.ascending = Boolean.FALSE;
+    }
+
+    public PersonCreditDateComparator(boolean ascending) {
+        this.ascending = ascending;
+    }
+
+    @Override
+    public int compare(PersonCredit pc1, PersonCredit pc2) {
+        return compare(pc1, pc2, ascending);
+    }
+
+    /**
+     * Compare two PersonCredits based on the respective years
+     *
+     * @param pc1
+     * @param pc2
+     * @param ascending
+     * @return
+     */
+    public int compare(PersonCredit pc1, PersonCredit pc2, boolean ascending) {
+        boolean valid1 = StringUtils.isNotBlank(pc1.getReleaseDate());
+        boolean valid2 = StringUtils.isNotBlank(pc2.getReleaseDate());
+
+        if (!valid1 && !valid2) {
+            return 0;
+        }
+
+        if (!valid1) {
+            return ascending ? -1 : 1;
+        }
+
+        if (!valid2) {
+            return ascending ? 1 : -1;
+        }
+
+        int year1 = extractYear(pc1.getReleaseDate());
+        int year2 = extractYear(pc2.getReleaseDate());
+        return ascending ? (year1 - year2) : (year2 - year1);
+    }
+
+    /**
+     * locate a 4 digit year in a date string
+     *
+     * @param date
+     * @return
+     */
+    private static int extractYear(String date) {
+        int year = 0;
+        Matcher m = YEAR_PATTERN.matcher(date);
+        if (m.find()) {
+            year = Integer.valueOf(m.group(1)).intValue();
+        }
+
+        // Give up and return 0
+        return year;
+    }
+}