com.github.nmorel.gwtjackson.client.deser.array.cast.StringArrayJsonDeserializer.java Source code

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Here is the source code for com.github.nmorel.gwtjackson.client.deser.array.cast.StringArrayJsonDeserializer.java

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/*
 * Copyright 2013 Nicolas Morel
 *
 * 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 com.github.nmorel.gwtjackson.client.deser.array.cast;

import com.github.nmorel.gwtjackson.client.JsonDeserializationContext;
import com.github.nmorel.gwtjackson.client.JsonDeserializer;
import com.github.nmorel.gwtjackson.client.JsonDeserializerParameters;
import com.github.nmorel.gwtjackson.client.deser.array.AbstractArrayJsonDeserializer;
import com.github.nmorel.gwtjackson.client.stream.JsonReader;
import com.github.nmorel.gwtjackson.client.stream.JsonToken;
import com.google.gwt.core.client.GWT;
import com.google.gwt.core.client.JsArrayString;

/**
 * Default {@link JsonDeserializer} implementation for array of {@link String}.
 * <p>Not working in production mode, cast problem. Can maybe work with disableCastChecking</p>
 *
 * @author Nicolas Morel
 */
public class StringArrayJsonDeserializer extends AbstractArrayJsonDeserializer<String[]> {

    private static final StringArrayJsonDeserializer INSTANCE = new StringArrayJsonDeserializer();

    /**
     * @return an instance of {@link StringArrayJsonDeserializer}
     */
    public static StringArrayJsonDeserializer getInstance() {
        return INSTANCE;
    }

    private static native String[] reinterpretCast(JsArrayString value) /*-{
                                                                        return value;
                                                                        }-*/;

    private StringArrayJsonDeserializer() {
    }

    @Override
    public String[] doDeserializeArray(JsonReader reader, JsonDeserializationContext ctx,
            JsonDeserializerParameters params) {
        JsArrayString jsArray = JsArrayString.createArray().cast();
        reader.beginArray();
        while (JsonToken.END_ARRAY != reader.peek()) {
            if (JsonToken.NULL == reader.peek()) {
                reader.skipValue();
                jsArray.push(null);
            } else {
                jsArray.push(reader.nextString());
            }
        }
        reader.endArray();

        if (GWT.isScript()) {
            return reinterpretCast(jsArray);
        } else {
            int length = jsArray.length();
            String[] ret = new String[length];
            for (int i = 0; i < length; i++) {
                ret[i] = jsArray.get(i);
            }
            return ret;
        }
    }

    @Override
    protected String[] doDeserializeSingleArray(JsonReader reader, JsonDeserializationContext ctx,
            JsonDeserializerParameters params) {
        return new String[] { reader.nextString() };
    }
}