114 lines
4.0 KiB
Java
114 lines
4.0 KiB
Java
/*
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* Copyright (c) 2015-present, Parse, LLC.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*/
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package com.parse;
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import android.os.Parcel;
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import java.util.ArrayList;
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import java.util.Collection;
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import java.util.HashSet;
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import java.util.Iterator;
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import java.util.List;
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import org.json.JSONArray;
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import org.json.JSONException;
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import org.json.JSONObject;
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/**
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* An operation that removes every instance of an element from an array field.
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*/
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/** package */ class ParseRemoveOperation implements ParseFieldOperation {
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/* package */ final static String OP_NAME = "Remove";
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protected final HashSet<Object> objects = new HashSet<>();
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public ParseRemoveOperation(Collection<?> coll) {
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objects.addAll(coll);
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}
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@Override
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public JSONObject encode(ParseEncoder objectEncoder) throws JSONException {
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JSONObject output = new JSONObject();
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output.put("__op", OP_NAME);
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output.put("objects", objectEncoder.encode(new ArrayList<>(objects)));
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return output;
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}
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@Override
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public void encode(Parcel dest, ParseParcelEncoder parcelableEncoder) {
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dest.writeString(OP_NAME);
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dest.writeInt(objects.size());
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for (Object object : objects) {
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parcelableEncoder.encode(object, dest);
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}
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}
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@Override
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public ParseFieldOperation mergeWithPrevious(ParseFieldOperation previous) {
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if (previous == null) {
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return this;
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} else if (previous instanceof ParseDeleteOperation) {
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return new ParseSetOperation(objects);
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} else if (previous instanceof ParseSetOperation) {
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Object value = ((ParseSetOperation) previous).getValue();
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if (value instanceof JSONArray || value instanceof List) {
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return new ParseSetOperation(this.apply(value, null));
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} else {
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throw new IllegalArgumentException("You can only add an item to a List or JSONArray.");
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}
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} else if (previous instanceof ParseRemoveOperation) {
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HashSet<Object> result = new HashSet<>(((ParseRemoveOperation) previous).objects);
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result.addAll(objects);
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return new ParseRemoveOperation(result);
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} else {
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throw new IllegalArgumentException("Operation is invalid after previous operation.");
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}
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}
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@Override
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public Object apply(Object oldValue, String key) {
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if (oldValue == null) {
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return new ArrayList<>();
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} else if (oldValue instanceof JSONArray) {
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ArrayList<Object> old = ParseFieldOperations.jsonArrayAsArrayList((JSONArray) oldValue);
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@SuppressWarnings("unchecked")
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ArrayList<Object> newValue = (ArrayList<Object>) this.apply(old, key);
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return new JSONArray(newValue);
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} else if (oldValue instanceof List) {
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ArrayList<Object> result = new ArrayList<>((List<?>) oldValue);
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result.removeAll(objects);
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// Remove the removed objects from "objects" -- the items remaining
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// should be ones that weren't removed by object equality.
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ArrayList<Object> objectsToBeRemoved = new ArrayList<>(objects);
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objectsToBeRemoved.removeAll(result);
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// Build up set of object IDs for any ParseObjects in the remaining objects-to-be-removed
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HashSet<String> objectIds = new HashSet<>();
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for (Object obj : objectsToBeRemoved) {
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if (obj instanceof ParseObject) {
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objectIds.add(((ParseObject) obj).getObjectId());
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}
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}
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// And iterate over "result" to see if any other ParseObjects need to be removed
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Iterator<Object> resultIterator = result.iterator();
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while (resultIterator.hasNext()) {
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Object obj = resultIterator.next();
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if (obj instanceof ParseObject && objectIds.contains(((ParseObject) obj).getObjectId())) {
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resultIterator.remove();
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}
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}
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return result;
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} else {
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throw new IllegalArgumentException("Operation is invalid after previous operation.");
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}
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}
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}
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