com.googlecode.gwt.test.internal.patchers.JsonUtilsPatcher Maven / Gradle / Ivy

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package com.googlecode.gwt.test.internal.patchers;

import com.google.gwt.core.client.JavaScriptObject;
import com.google.gwt.core.client.JsonUtils;
import com.googlecode.gwt.test.exceptions.GwtTestException;
import com.googlecode.gwt.test.exceptions.GwtTestJSONException;
import com.googlecode.gwt.test.patchers.PatchClass;
import com.googlecode.gwt.test.patchers.PatchMethod;
import com.googlecode.gwt.test.utils.JavaScriptObjects;
import org.apache.commons.lang3.StringEscapeUtils;
import org.codehaus.jackson.JsonFactory;
import org.codehaus.jackson.JsonParseException;
import org.codehaus.jackson.JsonParser;
import org.codehaus.jackson.JsonToken;

import java.io.IOException;
import java.util.List;

@PatchClass(JsonUtils.class)
class JsonUtilsPatcher {

    private static JsonFactory factory;

    @PatchMethod
    public static  T safeEval(String json) {
        return eval(json);
    }

    @PatchMethod
    public static  T unsafeEval(String json) {
        return eval(json);
    }

    @PatchMethod
    static String escapeValue(String toEscape) {
        return "\"" + StringEscapeUtils.escapeEcmaScript(toEscape) + "\"";
    }

    @PatchMethod
    static boolean hasJsonParse() {
        return true;
    }

    @PatchMethod
    static JavaScriptObject initEscapeTable() {
        return null;
    }

    private static  T eval(String json) {
        JsonParser jp = null;

        try {
            jp = getFactory().createJsonParser(json);
            jp.nextToken(); // will return JsonToken.START_OBJECT (verify?)
            return extractJso(json, jp.getCurrentToken(), jp).cast();
        } catch (Exception e) {
            if (e instanceof GwtTestException) {
                throw (GwtTestException) e;
            }
            throw new GwtTestJSONException("Error while parsing JSON string '" + json + "'", e);
        } finally {
            if (jp != null) {
                try {
                    // ensure resources get cleaned up timely and properly
                    jp.close();
                } catch (IOException e) {
                    // should never happen
                }
            }
        }
    }

    private static JavaScriptObject extractArray(String json, JsonToken currentToken, JsonParser jp)
            throws GwtTestJSONException, IOException {

        JavaScriptObject jsArray = JavaScriptObject.createArray();
        List