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-rwxr-xr-xlibparc/parc/algol/parc_Iterator.c159
1 files changed, 159 insertions, 0 deletions
diff --git a/libparc/parc/algol/parc_Iterator.c b/libparc/parc/algol/parc_Iterator.c
new file mode 100755
index 00000000..e70a0ff9
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+++ b/libparc/parc/algol/parc_Iterator.c
@@ -0,0 +1,159 @@
+/*
+ * Copyright (c) 2017 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ */
+#include <config.h>
+
+#include <parc/algol/parc_Iterator.h>
+
+struct parc_iterator {
+ PARCObject *object;
+ void *(*init)(PARCObject *);
+ bool (*hasNext)(PARCObject *, void *);
+ void *(*next)(PARCObject *, void *);
+ void (*remove)(PARCObject *, void **);
+ void *(*element)(PARCObject *, void *);
+ void (*fini)(PARCObject *, void *);
+ void (*assertValid)(const void *);
+ bool initialized;
+ void *state;
+};
+
+static void
+_parcIterator_Destroy(PARCIterator **iteratorPtr)
+{
+ PARCIterator *iterator = *iteratorPtr;
+
+ parcObject_Release(&(iterator->object));
+
+ (iterator->fini(iterator->object, iterator->state));
+}
+
+parcObject_ExtendPARCObject(PARCIterator, _parcIterator_Destroy, NULL, NULL, NULL, NULL, NULL, NULL);
+
+static void *
+_parcIterator_Init(PARCIterator *iterator)
+{
+ if (iterator->init) {
+ iterator->state = (iterator->init)(iterator->object);
+ }
+
+ if (iterator->assertValid) {
+ (iterator->assertValid)(iterator->state);
+ }
+
+ iterator->initialized = true;
+ return iterator->state;
+}
+
+static void
+_parcIteratorState_AssertValid(const PARCIterator *iterator)
+{
+ if (iterator->assertValid) {
+ (iterator->assertValid)(iterator->state);
+ }
+}
+
+PARCIterator *
+parcIterator_Create(PARCObject *object,
+ void *(*init)(PARCObject *),
+ bool (*hasNext)(PARCObject *, void *),
+ void *(*next)(PARCObject *, void *),
+ void (*remove)(PARCObject *, void **),
+ void *(*element)(PARCObject *, void *),
+ void (*fini)(PARCObject *, void *),
+ void (*assertValid)(const void *))
+{
+ assertNotNull(object, "PARCObject cannot be NULL.");
+ assertNotNull(init, "'init' function cannot be NULL.");
+ assertNotNull(hasNext, "'hasNext' function cannot be NULL.");
+ assertNotNull(next, "'next' function cannot be NULL.");
+ assertNotNull(element, "'element' function cannot be NULL.");
+ assertNotNull(fini, "'fini' function cannot be NULL.");
+
+ PARCIterator *result = parcObject_CreateInstance(PARCIterator);
+
+ if (result != NULL) {
+ result->object = parcObject_Acquire(object);
+ result->init = init;
+ result->hasNext = hasNext;
+ result->next = next;
+ result->remove = remove;
+ result->element = element;
+ result->fini = fini;
+ result->assertValid = assertValid;
+
+ result->initialized = false;
+ _parcIterator_Init(result);
+ }
+
+ return result;
+}
+
+bool
+parcIterator_IsValid(const PARCIterator *iterator)
+{
+ bool result = false;
+
+ if (iterator != NULL) {
+ if (parcObject_IsValid(iterator)) {
+ result = true;
+ }
+ }
+
+ return result;
+}
+
+void
+parcIterator_AssertValid(const PARCIterator *iterator)
+{
+ assertTrue(parcIterator_IsValid(iterator), "PARCIterator is not valid.");
+}
+
+parcObject_ImplementAcquire(parcIterator, PARCIterator);
+
+parcObject_ImplementRelease(parcIterator, PARCIterator);
+
+
+void *
+parcIterator_Next(PARCIterator *iterator)
+{
+ parcIterator_OptionalAssertValid(iterator);
+
+ iterator->state = (iterator->next)(iterator->object, iterator->state);
+
+ _parcIteratorState_AssertValid(iterator);
+
+ return (iterator->element)(iterator->object, iterator->state);
+}
+
+bool
+parcIterator_HasNext(const PARCIterator *iterator)
+{
+ parcIterator_OptionalAssertValid(iterator);
+
+ return (iterator->hasNext)(iterator->object, iterator->state);
+}
+
+void
+parcIterator_Remove(PARCIterator *iterator)
+{
+ if (iterator->remove != NULL) {
+ (iterator->remove)(iterator->object, &iterator->state);
+ }
+
+ _parcIteratorState_AssertValid(iterator);
+}