issue #163: PICA: add crosswalnk between MARC and PICA

src/main/java/de/gwdg/metadataqa/marc/utils/pica/crosswalk/Crosswalk.java

@@ -0,0 +1,45 @@
+package de.gwdg.metadataqa.marc.utils.pica.crosswalk;
+
+import com.opencsv.bean.CsvBindByPosition;
+
+public class Crosswalk {
+  @CsvBindByPosition(position = 0)
+  private String pica;
+  @CsvBindByPosition(position = 1)
+  private String picaUf;
+  @CsvBindByPosition(position = 2)
+  private String marc21;
+
+  public String getPica() {
+    return pica;
+  }
+
+  public void setPica(String pica) {
+    this.pica = pica;
+  }
+
+  public String getPicaUf() {
+    return picaUf;
+  }
+
+  public void setPicaUf(String picaUf) {
+    this.picaUf = picaUf;
+  }
+
+  public String getMarc21() {
+    return marc21;
+  }
+
+  public void setMarc21(String marc21) {
+    this.marc21 = marc21;
+  }
+
+  @Override
+  public String toString() {
+    return "Crosswalk{" +
+      "pica='" + pica + '\'' +
+      ", picaUf='" + picaUf + '\'' +
+      ", marc21='" + marc21 + '\'' +
+      '}';
+  }
+}

src/main/java/de/gwdg/metadataqa/marc/utils/pica/crosswalk/PicaMarcCrosswalkReader.java

@@ -0,0 +1,32 @@
+package de.gwdg.metadataqa.marc.utils.pica.crosswalk;
+
+import com.opencsv.CSVParserBuilder;
+import com.opencsv.CSVReader;
+import com.opencsv.CSVReaderBuilder;
+import com.opencsv.bean.CsvToBean;
+import com.opencsv.bean.CsvToBeanBuilder;
+
+import java.io.InputStreamReader;
+import java.util.List;
+
+public class PicaMarcCrosswalkReader {
+  private static List<Crosswalk> mapping;
+
+  public static List<Crosswalk> read() {
+    if (mapping == null)
+      initialize();
+
+    return mapping;
+  }
+
+  private static void initialize() {
+    InputStreamReader streamReader = new InputStreamReader(PicaMarcCrosswalkReader.class.getResourceAsStream("/pica/pica-marc.tsv"));
+    CSVReader reader = new CSVReaderBuilder(streamReader)
+      .withCSVParser(new CSVParserBuilder().withSeparator('\t').build())
+      .withSkipLines(1)
+      .build();
+    CsvToBean<Crosswalk> csvToBean = new CsvToBeanBuilder<Crosswalk>(reader).withType(Crosswalk.class).build();
+
+    mapping = csvToBean.parse();
+  }
+}