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package com.oracle.graal.python.builtins.objects.dict;

import com.oracle.graal.python.builtins.objects.common.HashingStorage;
import com.oracle.graal.python.builtins.objects.common.HashingStorage.DictEntry;
import com.oracle.graal.python.builtins.objects.common.HashingStorageLibrary;
import com.oracle.graal.python.builtins.objects.common.HashingStorageLibrary.HashingStorageIterator;
import com.oracle.graal.python.builtins.objects.common.PHashingCollection;
import com.oracle.graal.python.builtins.objects.object.PythonBuiltinObject;
import com.oracle.graal.python.runtime.object.PythonObjectFactory;
import com.oracle.truffle.api.CompilerDirectives.TruffleBoundary;
import com.oracle.truffle.api.object.Shape;

public abstract class PDictView extends PythonBuiltinObject {
    private final PHashingCollection dict;
    private final String name;

    public PDictView(Object clazz, Shape instanceShape, String name, PHashingCollection dict) {
        super(clazz, instanceShape);
        this.name = name;
        assert dict != null;
        this.dict = dict;
    }

    public final PHashingCollection getWrappedDict() {
        return dict;
    }

    public String getName() {
        return name;
    }

    public abstract static class PBaseDictIterator<T> extends PHashingStorageIterator<T> {

        protected final HashingStorage hashingStorage;

        public PBaseDictIterator(Object clazz, Shape instanceShape, HashingStorageIterator<T> iterator, HashingStorage hashingStorage, int initialSize) {
            super(clazz, instanceShape, iterator, initialSize);
            this.hashingStorage = hashingStorage;
        }

        public HashingStorage getHashingStorage() {
            return hashingStorage;
        }

        public Object next(@SuppressWarnings("unused") PythonObjectFactory factory) {
            return this.next();
        }

        public final boolean checkSizeChanged(HashingStorageLibrary lib) {
            return lib.length(hashingStorage) != size;
        }
    }

    // -----------------------------------------------------------------------------------------------------------------
    //
    // the keys
    //
    // -----------------------------------------------------------------------------------------------------------------
    public static final class PDictKeyIterator extends PBaseDictIterator<Object> {
        public PDictKeyIterator(Object clazz, Shape instanceShape, HashingStorageIterator<Object> iterator, HashingStorage hashingStorage, int initialSize) {
            super(clazz, instanceShape, iterator, hashingStorage, initialSize);
        }
    }

    public static final class PDictKeysView extends PDictView {

        public PDictKeysView(Object clazz, Shape instanceShape, PHashingCollection dict) {
            super(clazz, instanceShape, "dict_keys", dict);
        }
    }

    // -----------------------------------------------------------------------------------------------------------------
    //
    // the values
    //
    // -----------------------------------------------------------------------------------------------------------------
    public static final class PDictValueIterator extends PBaseDictIterator<Object> {
        public PDictValueIterator(Object clazz, Shape instanceShape, HashingStorageIterator<Object> iterator, HashingStorage hashingStorage, int initialSize) {
            super(clazz, instanceShape, iterator, hashingStorage, initialSize);
        }
    }

    public static final class PDictValuesView extends PDictView {

        public PDictValuesView(Object clazz, Shape instanceShape, PHashingCollection dict) {
            super(clazz, instanceShape, "dict_values", dict);
        }
    }

    // -----------------------------------------------------------------------------------------------------------------
    //
    // the items
    //
    // -----------------------------------------------------------------------------------------------------------------
    public static final class PDictItemIterator extends PBaseDictIterator<DictEntry> {
        public PDictItemIterator(Object clazz, Shape instanceShape, HashingStorageIterator<DictEntry> iterator, HashingStorage hashingStorage, int initialSize) {
            super(clazz, instanceShape, iterator, hashingStorage, initialSize);
        }

        @TruffleBoundary
        private DictEntry nextVal() {
            return (DictEntry) super.next();
        }

        @Override
        public Object next(PythonObjectFactory factory) {
            DictEntry value = nextVal();
            return factory.createTuple(new Object[]{value.getKey(), value.getValue()});
        }
    }

    public static final class PDictItemsView extends PDictView {

        public PDictItemsView(Object clazz, Shape instanceShape, PHashingCollection dict) {
            super(clazz, instanceShape, "dict_items", dict);
        }
    }
}
