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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsISupports.idl"
+
+interface nsISimpleEnumerator;
+
+/**
+ * nsIArray
+ *
+ * An indexed collection of elements. Provides basic functionality for
+ * retrieving elements at a specific position, searching for
+ * elements. Indexes are zero-based, such that the last element in the
+ * array is stored at the index length-1.
+ *
+ * For an array which can be modified, see nsIMutableArray below.
+ *
+ * Neither interface makes any attempt to protect the individual
+ * elements from modification. The convention is that the elements of
+ * the array should not be modified. Documentation within a specific
+ * interface should describe variations from this convention.
+ *
+ * It is also convention that if an interface provides access to an
+ * nsIArray, that the array should not be QueryInterfaced to an
+ * nsIMutableArray for modification. If the interface in question had
+ * intended the array to be modified, it would have returned an
+ * nsIMutableArray!
+ *
+ * null is a valid entry in the array, and as such any nsISupports
+ * parameters may be null, except where noted.
+ */
+[scriptable, builtinclass, uuid(114744d9-c369-456e-b55a-52fe52880d2d)]
+interface nsIArray : nsISupports
+{
+ /**
+ * length
+ *
+ * number of elements in the array.
+ */
+ readonly attribute unsigned long length;
+
+ /**
+ * queryElementAt()
+ *
+ * Retrieve a specific element of the array, and QueryInterface it
+ * to the specified interface. null is a valid result for
+ * this method, but exceptions are thrown in other circumstances
+ *
+ * @param index position of element
+ * @param uuid the IID of the requested interface
+ * @param result the object, QI'd to the requested interface
+ *
+ * @throws NS_ERROR_NO_INTERFACE when an entry exists at the
+ * specified index, but the requested interface is not
+ * available.
+ * @throws NS_ERROR_ILLEGAL_VALUE when index > length-1
+ *
+ */
+ void queryElementAt(in unsigned long index,
+ in nsIIDRef uuid,
+ [iid_is(uuid), retval] out nsQIResult result);
+
+ /**
+ * indexOf()
+ *
+ * Get the position of a specific element. Note that since null is
+ * a valid input, exceptions are used to indicate that an element
+ * is not found.
+ *
+ * @param startIndex The initial element to search in the array
+ * To start at the beginning, use 0 as the
+ * startIndex
+ * @param element The element you are looking for
+ * @returns a number >= startIndex which is the position of the
+ * element in the array.
+ * @throws NS_ERROR_FAILURE if the element was not in the array.
+ */
+ unsigned long indexOf(in unsigned long startIndex,
+ in nsISupports element);
+
+ /**
+ * enumerate the array
+ *
+ * @returns a new enumerator positioned at the start of the array
+ * @throws NS_ERROR_FAILURE if the array is empty (to make it easy
+ * to detect errors), or NS_ERROR_OUT_OF_MEMORY if out of memory.
+ */
+ [binaryname(ScriptedEnumerate), optional_argc]
+ nsISimpleEnumerator enumerate([optional] in nsIIDRef aElemIID);
+
+ [noscript]
+ nsISimpleEnumerator enumerateImpl(in nsIDRef aElemIID);
+
+ %{C++
+ nsresult
+ Enumerate(nsISimpleEnumerator** aRetVal, const nsID& aElemIID = NS_GET_IID(nsISupports))
+ {
+ return EnumerateImpl(aElemIID, aRetVal);
+ }
+ %}
+};