Add method putAll to put an array of key/value pairs into a map
Bug 30882, suggested by Rafael U. C. Afonso git-svn-id: https://svn.apache.org/repos/asf/jakarta/commons/proper/collections/trunk@131816 13f79535-47bb-0310-9956-ffa450edef68
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Stephen Colebourne
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a324ca7a63
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@ -40,6 +40,7 @@ The only new deprecations are ................
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<center><h3>ENHANCEMENTS</h3></center>
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<ul>
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<li>CollectionUtils.addIgnoreNull - Adds to the collection if the value being added is not null [30020]</li>
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<li>MapUtils.putAll - Puts an array of key/value pairs into a map [30882]</li>
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</ul>
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<center><h3>BUG FIXES</h3></center>
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@ -67,7 +67,7 @@ import org.apache.commons.collections.map.UnmodifiableSortedMap;
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* </ul>
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*
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* @since Commons Collections 1.0
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* @version $Revision: 1.47 $ $Date: 2004/07/17 21:23:59 $
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* @version $Revision: 1.48 $ $Date: 2004/09/22 23:03:50 $
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*
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* @author <a href="mailto:jstrachan@apache.org">James Strachan</a>
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* @author <a href="mailto:nissim@nksystems.com">Nissim Karpenstein</a>
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@ -1073,6 +1073,7 @@ public class MapUtils {
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return out;
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}
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//-----------------------------------------------------------------------
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/**
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* Protects against adding null values to a map.
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* <p>
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@ -1098,6 +1099,85 @@ public class MapUtils {
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}
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}
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//-----------------------------------------------------------------------
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/**
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* Puts all the keys and values from the specified array into the map.
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* <p>
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* This method is an alternative to the {@link java.util.Map#putAll(java.util.Map)}
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* method and constructors. It allows you to build a map from an object array
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* of various possible styles.
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* <p>
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* If the first entry in the object array implements {@link java.util.Map.Entry}
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* or {@link KeyValue} then the key and value are added from that object.
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* If the first entry in the object array is an object array itself, then
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* it is assumed that index 0 in the sub-array is the key and index 1 is the value.
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* Otherwise, the array is treated as keys and values in alternate indices.
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* <p>
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* For example, to create a color map:
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* <pre>
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* Map colorMap = MapUtils.putAll(new HashMap(), new String[][] {
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* {"RED", "#FF0000"},
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* {"GREEN", "#00FF00"},
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* {"BLUE", "#0000FF"}
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* });
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* </pre>
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* or:
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* <pre>
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* Map colorMap = MapUtils.putAll(new HashMap(), new String[] {
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* "RED", "#FF0000",
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* "GREEN", "#00FF00",
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* "BLUE", "#0000FF"
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* });
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* </pre>
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* or:
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* <pre>
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* Map colorMap = MapUtils.putAll(new HashMap(), new Map.Entry[] {
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* new DefaultMapEntry("RED", "#FF0000"),
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* new DefaultMapEntry("GREEN", "#00FF00"),
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* new DefaultMapEntry("BLUE", "#0000FF")
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* });
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* </pre>
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*
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* @param map the map to populate, must not be null
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* @param array an array to populate from, null ignored
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* @return the input map
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* @throws NullPointerException if map is null
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* @throws IllegalArgumentException if sub-array or entry matching used and an
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* entry is invalid
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* @throws ClassCaseException if the array contents is mixed
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*/
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public static Map putAll(Map map, Object[] array) {
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map.size(); // force NPE
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if (array == null || array.length == 0) {
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return map;
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}
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Object obj = array[0];
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if (obj instanceof Map.Entry) {
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for (int i = 0; i < array.length; i++) {
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Map.Entry entry = (Map.Entry) array[i];
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map.put(entry.getKey(), entry.getValue());
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}
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} else if (obj instanceof KeyValue) {
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for (int i = 0; i < array.length; i++) {
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KeyValue keyval = (KeyValue) array[i];
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map.put(keyval.getKey(), keyval.getValue());
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}
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} else if (obj instanceof Object[]) {
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for (int i = 0; i < array.length; i++) {
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Object[] sub = (Object[]) array[i];
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if (sub == null || sub.length < 2) {
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throw new IllegalArgumentException("Invalid array element: " + i);
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}
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map.put(sub[0], sub[1]);
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}
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} else {
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for (int i = 0; i < array.length - 1;) {
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map.put(array[i++], array[i++]);
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}
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}
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return map;
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}
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// Map decorators
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//-----------------------------------------------------------------------
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/**
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@ -28,6 +28,8 @@ import java.util.TreeMap;
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import junit.framework.Test;
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import org.apache.commons.collections.keyvalue.DefaultKeyValue;
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import org.apache.commons.collections.keyvalue.DefaultMapEntry;
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import org.apache.commons.collections.map.LazyMap;
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import org.apache.commons.collections.map.PredicatedMap;
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import org.apache.commons.collections.map.TestPredicatedMap;
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@ -35,7 +37,7 @@ import org.apache.commons.collections.map.TestPredicatedMap;
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/**
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* Tests for MapUtils.
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*
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* @version $Revision: 1.23 $ $Date: 2004/04/09 14:55:39 $
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* @version $Revision: 1.24 $ $Date: 2004/09/22 23:03:50 $
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*
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* @author Stephen Colebourne
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* @author Arun Mammen Thomas
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@ -215,6 +217,117 @@ public class TestMapUtils extends BulkTest {
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assertEquals( out.get("E"), "5" );
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}
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public void testPutAll_Map_array() {
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try {
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MapUtils.putAll(null, null);
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fail();
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} catch (NullPointerException ex) {}
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try {
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MapUtils.putAll(null, new Object[0]);
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fail();
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} catch (NullPointerException ex) {}
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Map test = MapUtils.putAll(new HashMap(), new String[0]);
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assertEquals(0, test.size());
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// sub array
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test = MapUtils.putAll(new HashMap(), new String[][] {
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{"RED", "#FF0000"},
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{"GREEN", "#00FF00"},
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{"BLUE", "#0000FF"}
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});
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assertEquals(true, test.containsKey("RED"));
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assertEquals("#FF0000", test.get("RED"));
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assertEquals(true, test.containsKey("GREEN"));
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assertEquals("#00FF00", test.get("GREEN"));
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assertEquals(true, test.containsKey("BLUE"));
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assertEquals("#0000FF", test.get("BLUE"));
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assertEquals(3, test.size());
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try {
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MapUtils.putAll(new HashMap(), new String[][] {
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{"RED", "#FF0000"},
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null,
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{"BLUE", "#0000FF"}
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});
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fail();
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} catch (IllegalArgumentException ex) {}
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try {
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MapUtils.putAll(new HashMap(), new String[][] {
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{"RED", "#FF0000"},
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{"GREEN"},
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{"BLUE", "#0000FF"}
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});
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fail();
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} catch (IllegalArgumentException ex) {}
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try {
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MapUtils.putAll(new HashMap(), new String[][] {
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{"RED", "#FF0000"},
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{},
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{"BLUE", "#0000FF"}
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});
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fail();
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} catch (IllegalArgumentException ex) {}
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// flat array
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test = MapUtils.putAll(new HashMap(), new String[] {
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"RED", "#FF0000",
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"GREEN", "#00FF00",
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"BLUE", "#0000FF"
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});
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assertEquals(true, test.containsKey("RED"));
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assertEquals("#FF0000", test.get("RED"));
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assertEquals(true, test.containsKey("GREEN"));
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assertEquals("#00FF00", test.get("GREEN"));
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assertEquals(true, test.containsKey("BLUE"));
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assertEquals("#0000FF", test.get("BLUE"));
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assertEquals(3, test.size());
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test = MapUtils.putAll(new HashMap(), new String[] {
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"RED", "#FF0000",
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"GREEN", "#00FF00",
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"BLUE", "#0000FF",
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"PURPLE" // ignored
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});
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assertEquals(true, test.containsKey("RED"));
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assertEquals("#FF0000", test.get("RED"));
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assertEquals(true, test.containsKey("GREEN"));
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assertEquals("#00FF00", test.get("GREEN"));
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assertEquals(true, test.containsKey("BLUE"));
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assertEquals("#0000FF", test.get("BLUE"));
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assertEquals(3, test.size());
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// map entry
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test = MapUtils.putAll(new HashMap(), new Object[] {
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new DefaultMapEntry("RED", "#FF0000"),
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new DefaultMapEntry("GREEN", "#00FF00"),
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new DefaultMapEntry("BLUE", "#0000FF")
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});
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assertEquals(true, test.containsKey("RED"));
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assertEquals("#FF0000", test.get("RED"));
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assertEquals(true, test.containsKey("GREEN"));
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assertEquals("#00FF00", test.get("GREEN"));
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assertEquals(true, test.containsKey("BLUE"));
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assertEquals("#0000FF", test.get("BLUE"));
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assertEquals(3, test.size());
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// key value
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test = MapUtils.putAll(new HashMap(), new Object[] {
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new DefaultKeyValue("RED", "#FF0000"),
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new DefaultKeyValue("GREEN", "#00FF00"),
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new DefaultKeyValue("BLUE", "#0000FF")
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});
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assertEquals(true, test.containsKey("RED"));
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assertEquals("#FF0000", test.get("RED"));
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assertEquals(true, test.containsKey("GREEN"));
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assertEquals("#00FF00", test.get("GREEN"));
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assertEquals(true, test.containsKey("BLUE"));
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assertEquals("#0000FF", test.get("BLUE"));
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assertEquals(3, test.size());
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}
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public void testConvertResourceBundle() {
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final Map in = new HashMap( 5 , 1 );
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in.put( "1" , "A" );
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