74 lines
2.4 KiB
Java
74 lines
2.4 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 org.json.JSONException;
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import org.json.JSONObject;
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/**
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* An operation that increases a numeric field's value by a given amount.
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*/
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/** package */ class ParseIncrementOperation implements ParseFieldOperation {
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/* package */ final static String OP_NAME = "Increment";
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private final Number amount;
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public ParseIncrementOperation(Number amount) {
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this.amount = amount;
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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("amount", amount);
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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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parcelableEncoder.encode(amount, dest); // Let encoder figure out how to parcel Number
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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(amount);
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} else if (previous instanceof ParseSetOperation) {
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Object oldValue = ((ParseSetOperation) previous).getValue();
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if (oldValue instanceof Number) {
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return new ParseSetOperation(Numbers.add((Number) oldValue, amount));
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} else {
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throw new IllegalArgumentException("You cannot increment a non-number.");
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}
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} else if (previous instanceof ParseIncrementOperation) {
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Number oldAmount = ((ParseIncrementOperation) previous).amount;
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return new ParseIncrementOperation(Numbers.add(oldAmount, amount));
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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 amount;
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} else if (oldValue instanceof Number) {
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return Numbers.add((Number) oldValue, amount);
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} else {
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throw new IllegalArgumentException("You cannot increment a non-number.");
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}
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}
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}
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