Examples of org.apache.commons.collections.BidiMap

org.apache.commons.collections.BidiMap
Defines a map that allows bidirectional lookup between key and values.
This extended Map represents a mapping where a key may lookup a value and a value may lookup a key with equal ease. This interface extends Map and so may be used anywhere a map is required. The interface provides an inverse map view, enabling full access to both directions of the BidiMap.
Implementations should allow a value to be looked up from a key and a key to be looked up from a value with equal performance.
This map enforces the restriction that there is a 1:1 relation between keys and values, meaning that multiple keys cannot map to the same value. This is required so that "inverting" the map results in a map without duplicate keys. See the {@link #put} method description for more information. @since Commons Collections 3.0 @version $Revision: 1.16 $ $Date: 2004/05/10 20:37:19 $ @author Stephen Colebourne

            bidi.put(entries[i][0], entries[i][1]);
        }
        return UnmodifiableBidiMap.decorate(bidi);
    }
    public Map makeFullMap() {
        BidiMap bidi = new DualHashBidiMap();
        addSampleMappings(bidi);
        return UnmodifiableBidiMap.decorate(bidi);
    }

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     * Override to create a full <code>BidiMap</code> other than the default.
     * 
     * @return a full <code>BidiMap</code> implementation.
     */
    public BidiMap makeFullBidiMap() {
        final BidiMap map = makeEmptyBidiMap();
        for (int i = 0; i < entries.length; i++) {
            map.put(entries[i][0], entries[i][1]);
        }
        return map;
    }

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    // BidiPut
    //-----------------------------------------------------------------------
    public void testBidiPut() {
        if (isPutAddSupported() == false || isPutChangeSupported() == false) return;


        BidiMap map = makeEmptyBidiMap();
        BidiMap inverse = map.inverseBidiMap();
        assertEquals(0, map.size());
        assertEquals(map.size(), inverse.size());
        
        map.put("A", "B");
        assertEquals(1, map.size());
        assertEquals(map.size(), inverse.size());
        assertEquals("B", map.get("A"));
        assertEquals("A", inverse.get("B"));
        
        map.put("A", "C");
        assertEquals(1, map.size());
        assertEquals(map.size(), inverse.size());
        assertEquals("C", map.get("A"));
        assertEquals("A", inverse.get("C"));
        
        map.put("B", "C");
        assertEquals(1, map.size());
        assertEquals(map.size(), inverse.size());
        assertEquals("C", map.get("B"));
        assertEquals("B", inverse.get("C"));
        
        map.put("E", "F");
        assertEquals(2, map.size());
        assertEquals(map.size(), inverse.size());
        assertEquals("F", map.get("E"));
        assertEquals("E", inverse.get("F"));
    }

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