Java 类org.apache.commons.collections.iterators.EnumerationIterator 实例源码

public Iterable<URL> getResources(String name) throws IOException {
    final Enumeration<URL> resources =
        getClassLoaderNotNull().getResources(name);
    //noinspection unchecked
    return new IteratorIterable<URL>(
        new EnumerationIterator(resources));
}

public Object change(Object value)
        throws EternaException
{
    if (value == null)
    {
        return null;
    }
    if (value instanceof Iterator)
    {
        if (!(value instanceof PreFetchIterator))
        {
            return new PreFetchIterator((Iterator) value);
        }
        return value;
    }
    else if (value instanceof Collection)
    {
        return new PreFetchIterator(((Collection) value).iterator());
    }
    else if (value instanceof Object[])
    {
        return new PreFetchIterator(Arrays.asList((Object[]) value).iterator());
    }
    else if (value instanceof Map)
    {
        return new PreFetchIterator(((Map) value).entrySet().iterator());
    }
    else if (value instanceof Enumeration)
    {
        return new PreFetchIterator(new EnumerationIterator((Enumeration) value));
    }
    throw new EternaException("Error Object type:" + value.getClass() + ".");
}

public Statement initStatement(SourceLocation sourceLocation) {
    return new Statement(sourceLocation) {

        @Override
        public VbValue eval(Interpreter interpreter, CallFrame frame) throws VbRuntimeException {
            VbValue col = collection.eval(interpreter, frame);
            if (col.varType.vbType == VbVarType.vbVariant) {
                col = (VbValue) col.value;
            }
            if (col.varType.vbType == VbVarType.vbArray) {
                VbArray arr = (VbArray) col;
                iterator = arr.iterator();
            } else if (col.varType.isJavaObject()) {
                if (col.value.getClass().isArray()) {
                    iterator = new JavaArrayIterator(col.value);
                } else if (col.value instanceof Iterable) {
                    iterator = new VbValueIterator(((Iterable) col.value).iterator());
                } else if (col.value instanceof Enumeration) {
                    iterator = new VbValueIterator(new EnumerationIterator((Enumeration) col.value));
                } else if (col.value instanceof Map) {
                    Map map = (Map) col.value;
                    iterator = new VbValueIterator(map.values().iterator());
                }
            }
            if (iterator == null && col.isObject()) {
                ClassModuleDecl c = col.varType.getClassModuleDecl();
                ModuleMemberDecl it = (c != null ? c.getIteratorMember() : null);
                if (it == null) {
                    throw new VbRuntimeException(VbRuntimeException.类型不匹配, sourceLocation);
                }
                MethodDecl itMethod = null;
                if (it instanceof PropertyDecl) {
                    PropertyDecl p = (PropertyDecl) it;
                    if (p.get == null || p.get.arguments.size() > 0) {
                        throw new VbRuntimeException(VbRuntimeException.无效的过程调用, sourceLocation);
                    }
                    itMethod = p.get;
                } else if (it instanceof MethodDecl) {
                    itMethod = (MethodDecl) it;
                    if (itMethod.arguments.size() > 0) {
                        throw new VbRuntimeException(VbRuntimeException.无效的过程调用, sourceLocation);
                    }
                }

                try {
                    VbValue itr = interpreter.callMethod((ModuleInstance) col.value, itMethod);
                    if (itr != null) {
                        if (itr.value instanceof JavaModuleInstance) {
                            JavaModuleInstance inst = (JavaModuleInstance) itr.value;
                            Object obj = inst.getInstance();
                            if (obj instanceof Iterator) {
                                iterator = (Iterator) obj;
                            }
                        } else if (itr.value instanceof Iterator) {
                            iterator = (Iterator<VbValue>) itr.value;
                        }
                    }
                    if (iterator == null) {
                        throw new VbRuntimeException(VbRuntimeException.类型不匹配, sourceLocation);
                    }
                } catch (ArgumentException e) {
                    // no arguments
                }
            }
            return null;
        }

        @Override
        public String toString() {
            return "For Each Iterator At " + varDecl;
        }
    };
}