Examples of java.util.ArrayList

java.util.ArrayList
Resizable-array implementation of the List interface. Implements all optional list operations, and permits all elements, including null. In addition to implementing the List interface, this class provides methods to manipulate the size of the array that is used internally to store the list. (This class is roughly equivalent to Vector, except that it is unsynchronized.)
The size, isEmpty, get, set, iterator, and listIterator operations run in constant time. The add operation runs in amortized constant time, that is, adding n elements requires O(n) time. All of the other operations run in linear time (roughly speaking). The constant factor is low compared to that for the LinkedList implementation.
Each ArrayList instance has a capacity. The capacity is the size of the array used to store the elements in the list. It is always at least as large as the list size. As elements are added to an ArrayList, its capacity grows automatically. The details of the growth policy are not specified beyond the fact that adding an element has constant amortized time cost.
An application can increase the capacity of an ArrayList instance before adding a large number of elements using the ensureCapacity operation. This may reduce the amount of incremental reallocation.
Note that this implementation is not synchronized. If multiple threads access an ArrayList instance concurrently, and at least one of the threads modifies the list structurally, it must be synchronized externally. (A structural modification is any operation that adds or deletes one or more elements, or explicitly resizes the backing array; merely setting the value of an element is not a structural modification.) This is typically accomplished by synchronizing on some object that naturally encapsulates the list. If no such object exists, the list should be "wrapped" using the {@link Collections#synchronizedList Collections.synchronizedList}method. This is best done at creation time, to prevent accidental unsynchronized access to the list:
```
 List list = Collections.synchronizedList(new ArrayList(...));
```
The iterators returned by this class's iterator and listIterator methods are fail-fast: if the list is structurally modified at any time after the iterator is created, in any way except through the iterator's own remove or add methods, the iterator will throw a {@link ConcurrentModificationException}. Thus, in the face of concurrent modification, the iterator fails quickly and cleanly, rather than risking arbitrary, non-deterministic behavior at an undetermined time in the future.
Note that the fail-fast behavior of an iterator cannot be guaranteed as it is, generally speaking, impossible to make any hard guarantees in the presence of unsynchronized concurrent modification. Fail-fast iterators throw ConcurrentModificationException on a best-effort basis. Therefore, it would be wrong to write a program that depended on this exception for its correctness: the fail-fast behavior of iterators should be used only to detect bugs.
This class is a member of the Java Collections Framework. @author Josh Bloch @author Neal Gafter @version 1.56, 04/21/06 @see Collection @see List @see LinkedList @see Vector @since 1.2

        ufc.setGroup(new GroupSymbol("t2")); //$NON-NLS-1$ 
        
        UnaryFromClause ufc2 = new UnaryFromClause();
        ufc2.setGroup(new GroupSymbol("t3")); //$NON-NLS-1$
        
        List criteria = new ArrayList();
        criteria.add(new CompareCriteria(new ElementSymbol("t2.a"), AbstractCompareCriteria.EQ, new ElementSymbol("t3.a")));//$NON-NLS-1$//$NON-NLS-2$
        JoinPredicate joinPredicate = new JoinPredicate(ufc, ufc2, JoinType.JOIN_INNER, criteria);
        joinPredicate.setOptional(true);


        UnaryFromClause ufc3 = new UnaryFromClause();
        ufc3.setGroup(new GroupSymbol("t1")); //$NON-NLS-1$

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        sfc.setOptional(true);
        
        UnaryFromClause ufc2 = new UnaryFromClause();
        ufc2.setGroup(new GroupSymbol("t3")); //$NON-NLS-1$
        
        List criteria = new ArrayList();
        criteria.add(new CompareCriteria(new ElementSymbol("x.a"), AbstractCompareCriteria.EQ, new ElementSymbol("t3.a")));//$NON-NLS-1$//$NON-NLS-2$
        JoinPredicate joinPredicate = new JoinPredicate(sfc, ufc2, JoinType.JOIN_INNER, criteria);
        joinPredicate.setOptional(true);


        UnaryFromClause ufc3 = new UnaryFromClause();
        ufc3.setGroup(new GroupSymbol("t1")); //$NON-NLS-1$

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        UnaryFromClause ufc2 = new UnaryFromClause();
        ufc2.setGroup(new GroupSymbol("t2")); //$NON-NLS-1$
        ufc2.setOptional(true);
        
        List criteria = new ArrayList();
        criteria.add(new CompareCriteria(new ElementSymbol("t1.a"), AbstractCompareCriteria.EQ, new ElementSymbol("t2.a")));//$NON-NLS-1$//$NON-NLS-2$
        JoinPredicate joinPredicate = new JoinPredicate(ufc, ufc2, JoinType.JOIN_LEFT_OUTER, criteria);


        UnaryFromClause ufc3 = new UnaryFromClause();
        ufc3.setGroup(new GroupSymbol("t3")); //$NON-NLS-1$
        ufc3.setOptional(true);


        criteria = new ArrayList();
        criteria.add(new CompareCriteria(new ElementSymbol("t1.a"), AbstractCompareCriteria.EQ, new ElementSymbol("t3.a")));//$NON-NLS-1$//$NON-NLS-2$
        JoinPredicate joinPredicate2 = new JoinPredicate(joinPredicate, ufc3, JoinType.JOIN_LEFT_OUTER, criteria);


        from.addClause(joinPredicate2);
        query.setFrom(from);

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        ElementSymbol var1 = new ElementSymbol("var1"); //$NON-NLS-1$
        String shortType = new String("short"); //$NON-NLS-1$
        Statement declStmt = new DeclareStatement(var1, shortType);
        
        //ifblock
        List symbols = new ArrayList();
        symbols.add(new ElementSymbol("a1"));  //$NON-NLS-1$
        Select select = new Select(symbols);       
        
        From from = new From();
        from.addGroup(new GroupSymbol("g")); //$NON-NLS-1$
        
        Criteria criteria = new CompareCriteria(new ElementSymbol("a2"), CompareCriteria.EQ,  //$NON-NLS-1$
            new Constant(new Integer(5)));
        
        Query query = new Query();
        query.setSelect(select);
        query.setFrom(from);
        query.setCriteria(criteria);
        
        AssignmentStatement queryStmt = new AssignmentStatement(var1, query);
              
        Block ifBlock = new Block();      
        ifBlock.addStatement(queryStmt);
        
        //else block 
        ElementSymbol var2 = new ElementSymbol("var2"); //$NON-NLS-1$
        Statement elseDeclStmt = new DeclareStatement(var2, shortType);     
        
        List elseSymbols = new ArrayList();
        elseSymbols.add(new ElementSymbol("b1"));  //$NON-NLS-1$
        Select elseSelect = new Select(elseSymbols); 
    
        Query elseQuery = new Query();
        elseQuery.setSelect(elseSelect);
        From elseFrom = (From)from.clone();
        UnaryFromClause ufc = new UnaryFromClause();
        ufc.setGroup(new GroupSymbol("h")); //$NON-NLS-1$ 
        ufc.setOptional(true);
        elseFrom.addClause(ufc);
        elseQuery.setFrom(elseFrom);
        elseQuery.setCriteria(criteria);
        
        AssignmentStatement elseQueryStmt = new AssignmentStatement(var2, elseQuery);
        
        Block elseBlock = new Block();
        List elseStmts = new ArrayList();
        elseStmts.add(elseDeclStmt);
        elseStmts.add(elseQueryStmt);
      
        elseBlock.setStatements(elseStmts);
   
        //has criteria
        ElementSymbol a = new ElementSymbol("a"); //$NON-NLS-1$
        List elements = new ArrayList();
        elements.add(a);
        
        CriteriaSelector critSelector = new CriteriaSelector();
        critSelector.setSelectorType(CriteriaSelector.IN);
        critSelector.setElements(elements);

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    /**
     * @param row
     * @param neededColumns
     */
    static List projectRow(List row, int[] neededColumns) {
        List output = new ArrayList(neededColumns.length);
        
        for(int i=0; i<neededColumns.length; i++) {
            output.add(row.get(neededColumns[i]-1));
        }
        
        return output;    
    }

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        GroupSymbol g3 = new GroupSymbol("db.g3"); //$NON-NLS-1$
        ElementSymbol a = new ElementSymbol("a");  //$NON-NLS-1$
        ElementSymbol b = new ElementSymbol("b");  //$NON-NLS-1$
        ElementSymbol c = new ElementSymbol("c");  //$NON-NLS-1$
        
        List crits = new ArrayList();
        crits.add(new CompareCriteria(a, CompareCriteria.EQ, b));
        JoinPredicate jp = new JoinPredicate(new UnaryFromClause(g1), new UnaryFromClause(g2), JoinType.JOIN_INNER, crits);
        jp.setMakeDep(true);
        List crits2 = new ArrayList();
        crits2.add(new CompareCriteria(a, CompareCriteria.EQ, c));
        JoinPredicate jp2 = new JoinPredicate(jp, new UnaryFromClause(g3), JoinType.JOIN_LEFT_OUTER, crits2);
        From from = new From();
        from.addClause(jp2);


        Select select = new Select();

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      QueryResolver.resolveCommand(command, md);
    }
    
        ValidatorReport repo = Validator.validate(command, md);


        Collection failures = new ArrayList();
        repo.collectInvalidObjects(failures);
        if (failures.size() > 0){
            fail("Exception during validation (" + repo); //$NON-NLS-1$
        }
        
    // rewrite
    command = QueryRewriter.rewrite(command, md, new CommandContext());

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            new String[] { "SELECT 1 FROM pm1.g1", //$NON-NLS-1$
                            "SELECT 1 FROM pm1.g2" } );     //$NON-NLS-1$
    }
    
    @Test public void testPushMatchCritWithReference() throws Exception {
        List bindings = new ArrayList();
        bindings.add("pm1.g2.e1"); //$NON-NLS-1$
        helpPlan("select e1 FROM pm1.g1 WHERE e1 LIKE ?", example1(), bindings, null,  //$NON-NLS-1$
            new String[] { "SELECT g_0.e1 FROM pm1.g1 AS g_0 WHERE g_0.e1 LIKE PM1.G2.e1" }, ComparisonMode.EXACT_COMMAND_STRING ); //$NON-NLS-1$
    }

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            List bestOrder = null;


            for (int i = 0; i < orderList.size(); i++) {
                Integer index = orderList.get(i);
                
                List order = new ArrayList(Arrays.asList(bestSubOrder));
                order.add(index);
                
                double partialScore = region.scoreRegion(order.toArray(), bestSubOrder.length, metadata, capFinder, context);
                
                if (partialScore < bestPartialScore) {
                    bestPartialScore = partialScore;
                    bestOrder = order;
                }

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    }
  }


  public void up() {
    TreeControlNode parent = getParent();
    ArrayList brothers = parent.children;
    int myIndex = brothers.indexOf(this);
    if (myIndex<brothers.size()-1) {
      TreeControlNode nextOne =
        (TreeControlNode) brothers.get(myIndex + 1);      
      brothers.set(myIndex, nextOne);
      brothers.set(myIndex + 1, this);
    }    
    rebuildLast(brothers);
  }

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