org.eclipse.jgit.diff.EditDeserializer.java Source code

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Here is the source code for org.eclipse.jgit.diff.EditDeserializer.java

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// Copyright (C) 2009 The Android Open Source Project
//
// 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.

package org.eclipse.jgit.diff;

import com.google.gson.JsonArray;
import com.google.gson.JsonDeserializationContext;
import com.google.gson.JsonDeserializer;
import com.google.gson.JsonElement;
import com.google.gson.JsonNull;
import com.google.gson.JsonParseException;
import com.google.gson.JsonPrimitive;
import com.google.gson.JsonSerializationContext;
import com.google.gson.JsonSerializer;

import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.List;

public class EditDeserializer implements JsonDeserializer<Edit>, JsonSerializer<Edit> {
    @Override
    public Edit deserialize(final JsonElement json, final Type typeOfT, final JsonDeserializationContext context)
            throws JsonParseException {
        if (json.isJsonNull()) {
            return null;
        }
        if (!json.isJsonArray()) {
            throw new JsonParseException("Expected array for Edit type");
        }

        final JsonArray o = (JsonArray) json;
        final int cnt = o.size();
        if (cnt < 4 || cnt % 4 != 0) {
            throw new JsonParseException("Expected array of 4 for Edit type");
        }

        if (4 == cnt) {
            return new Edit(get(o, 0), get(o, 1), get(o, 2), get(o, 3));
        }

        List<Edit> l = new ArrayList<>((cnt / 4) - 1);
        for (int i = 4; i < cnt;) {
            int as = get(o, i++);
            int ae = get(o, i++);
            int bs = get(o, i++);
            int be = get(o, i++);
            l.add(new Edit(as, ae, bs, be));
        }
        return new ReplaceEdit(get(o, 0), get(o, 1), get(o, 2), get(o, 3), l);
    }

    private static int get(final JsonArray a, final int idx) throws JsonParseException {
        final JsonElement v = a.get(idx);
        if (!v.isJsonPrimitive()) {
            throw new JsonParseException("Expected array of 4 for Edit type");
        }
        final JsonPrimitive p = (JsonPrimitive) v;
        if (!p.isNumber()) {
            throw new JsonParseException("Expected array of 4 for Edit type");
        }
        return p.getAsInt();
    }

    @Override
    public JsonElement serialize(final Edit src, final Type typeOfSrc, final JsonSerializationContext context) {
        if (src == null) {
            return JsonNull.INSTANCE;
        }
        final JsonArray a = new JsonArray();
        add(a, src);
        if (src instanceof ReplaceEdit) {
            for (Edit e : ((ReplaceEdit) src).getInternalEdits()) {
                add(a, e);
            }
        }
        return a;
    }

    private void add(final JsonArray a, final Edit src) {
        a.add(new JsonPrimitive(src.getBeginA()));
        a.add(new JsonPrimitive(src.getEndA()));
        a.add(new JsonPrimitive(src.getBeginB()));
        a.add(new JsonPrimitive(src.getEndB()));
    }
}