Examples of org.apache.commons.collections.MapIterator

org.apache.commons.collections.MapIterator
Defines an iterator that operates over a Map.
This iterator is a special version designed for maps. It can be more efficient to use this rather than an entry set iterator where the option is available, and it is certainly more convenient.
A map that provides this interface may not hold the data internally using Map Entry objects, thus this interface can avoid lots of object creation.
In use, this iterator iterates through the keys in the map. After each call to next(), the getValue() method provides direct access to the value. The value can also be set using setValue().
```
 MapIterator it = map.mapIterator(); while (it.hasNext()) { Object key = it.next(); Object value = it.getValue(); it.setValue(newValue); } 
```
@since Commons Collections 3.0 @version $Revision: 1.7 $ $Date: 2004/02/18 01:15:42 $ @author Stephen Colebourne

    //-----------------------------------------------------------------------
    public void testMapIteratorRemoveGetKey() {
        if (supportsRemove() == false) {
            return;
        }
        MapIterator it = makeFullMapIterator();
        Map map = getMap();
        Map confirmed = getConfirmedMap();
        
        assertEquals(true, it.hasNext());
        Object key = it.next();
        
        it.remove();
        confirmed.remove(key);
        verify();
        
        try {
            it.getKey();
            fail();
        } catch (IllegalStateException ex) {}
        verify();
    }

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    //-----------------------------------------------------------------------
    public void testMapIteratorRemoveGetValue() {
        if (supportsRemove() == false) {
            return;
        }
        MapIterator it = makeFullMapIterator();
        Map map = getMap();
        Map confirmed = getConfirmedMap();
        
        assertEquals(true, it.hasNext());
        Object key = it.next();
        
        it.remove();
        confirmed.remove(key);
        verify();
        
        try {
            it.getValue();
            fail();
        } catch (IllegalStateException ex) {}
        verify();
    }

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    public void testMapIterator() {
        assertTrue(makeEmptyMapIterator() instanceof Unmodifiable);
    }
    
    public void testDecorateFactory() {
        MapIterator it = makeFullMapIterator();
        assertSame(it, UnmodifiableMapIterator.decorate(it));
        
        it = ((BidiMap) getMap()).mapIterator() ;
        assertTrue(it != UnmodifiableMapIterator.decorate(it));

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        }
        Map map = (Map) obj;
        if (map.size() != size()) {
            return false;
        }
        MapIterator it = mapIterator();
        try {
            while (it.hasNext()) {
                Object key = it.next();
                Object value = it.getValue();
                if (value == null) {
                    if (map.get(key) != null || map.containsKey(key) == false) {
                        return false;
                    }
                } else {

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            return "{}";
        }
        StringBuffer buf = new StringBuffer(32 * size());
        buf.append('{');


        MapIterator it = mapIterator();
        boolean hasNext = it.hasNext();
        while (hasNext) {
            Object key = it.next();
            Object value = it.getValue();
            buf.append(key == this ? "(this Map)" : key)
                    .append('=')
                    .append(value == this ? "(this Map)" : value);


            hasNext = it.hasNext();
            if (hasNext) {
                buf.append(',').append(' ');
            }
        }

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        Object newValue1 = getOtherValues()[0];
        Object newValue2 = getOtherValues()[1];
        
        resetFull();
        BidiMap bidi = (BidiMap) map;
        MapIterator it = bidi.mapIterator();
        assertEquals(true, it.hasNext());
        Object key1 = it.next();
        
        if (isSetValueSupported() == false) {
            try {
                it.setValue(newValue1);
                fail();
            } catch (UnsupportedOperationException ex) {
            }
            return;
        }
        
        it.setValue(newValue1);
        confirmed.put(key1, newValue1);
        assertSame(key1, it.getKey());
        assertSame(newValue1, it.getValue());
        assertEquals(true, bidi.containsKey(key1));
        assertEquals(true, bidi.containsValue(newValue1));
        assertEquals(newValue1, bidi.get(key1));
        verify();
        
        it.setValue(newValue1);  // same value - should be OK
        confirmed.put(key1, newValue1);
        assertSame(key1, it.getKey());
        assertSame(newValue1, it.getValue());
        assertEquals(true, bidi.containsKey(key1));
        assertEquals(true, bidi.containsValue(newValue1));
        assertEquals(newValue1, bidi.get(key1));
        verify();
        
        Object key2 = it.next();
        it.setValue(newValue2);
        confirmed.put(key2, newValue2);
        assertSame(key2, it.getKey());
        assertSame(newValue2, it.getValue());
        assertEquals(true, bidi.containsKey(key2));
        assertEquals(true, bidi.containsValue(newValue2));
        assertEquals(newValue2, bidi.get(key2));
        verify();
        
        // at this point
        // key1=newValue1, key2=newValue2
        try {
            it.setValue(newValue1);  // should remove key1
            fail();
        } catch (IllegalArgumentException ex) {
            return;  // simplest way of dealing with tricky situation
        }
        confirmed.put(key2, newValue1);
        AbstractTestBidiMap.this.confirmed.remove(key1);
        assertEquals(newValue1, it.getValue());
        assertEquals(true, bidi.containsKey(it.getKey()));
        assertEquals(true, bidi.containsValue(newValue1));
        assertEquals(newValue1, bidi.get(it.getKey()));
        assertEquals(false, bidi.containsKey(key1));
        assertEquals(false, bidi.containsValue(newValue2));
        verify();
            
        // check for ConcurrentModification
        it.next();  // if you fail here, maybe you should be throwing an IAE, see above
        if (isRemoveSupported()) {
            it.remove();
        }
    }

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        map = (Map) in.readObject();
    }


    //-----------------------------------------------------------------------
    public MapIterator mapIterator() {
        MapIterator it = getOrderedMap().mapIterator();
        return UnmodifiableMapIterator.decorate(it);
    }

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        }
        Map map = (Map) obj;
        if (map.size() != size()) {
            return false;
        }
        MapIterator it = mapIterator();
        try {
            while (it.hasNext()) {
                Object key = it.next();
                Object value = it.getValue();
                if (value == null) {
                    if (map.get(key) != null || map.containsKey(key) == false) {
                        return false;
                    }
                } else {

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            return "{}";
        }
        StringBuffer buf = new StringBuffer(32 * size());
        buf.append('{');


        MapIterator it = mapIterator();
        boolean hasNext = it.hasNext();
        while (hasNext) {
            Object key = it.next();
            Object value = it.getValue();
            buf.append(key == this ? "(this Map)" : key)
               .append('=')
               .append(value == this ? "(this Map)" : value);


            hasNext = it.hasNext();
            if (hasNext) {
                buf.append(',').append(' ');
            }
        }

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    public void testEmptyMapIterator() {
        if (supportsEmptyIterator() == false) {
            return;
        }


        MapIterator it = makeEmptyMapIterator();
        Map map = getMap();
        assertEquals(false, it.hasNext());
        
        // next() should throw a NoSuchElementException
        try {
            it.next();
            fail();
        } catch (NoSuchElementException ex) {}
        
        // getKey() should throw an IllegalStateException
        try {
            it.getKey();
            fail();
        } catch (IllegalStateException ex) {}
        
        // getValue() should throw an IllegalStateException
        try {
            it.getValue();
            fail();
        } catch (IllegalStateException ex) {}
        
        if (supportsSetValue() == false) {
            // setValue() should throw an UnsupportedOperationException/IllegalStateException
            try {
                it.setValue(addSetValues()[0]);
                fail();
            } catch (UnsupportedOperationException ex) {
            } catch (IllegalStateException ex) {}
        } else {
            // setValue() should throw an IllegalStateException
            try {
                it.setValue(addSetValues()[0]);
                fail();
            } catch (IllegalStateException ex) {}
        }
    }

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