ca.uhn.fhir.i18n.HapiLocalizer.java Source code

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Here is the source code for ca.uhn.fhir.i18n.HapiLocalizer.java

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package ca.uhn.fhir.i18n;

import static org.apache.commons.lang3.StringUtils.isNotBlank;

/*
 * #%L
 * HAPI FHIR - Core Library
 * %%
 * Copyright (C) 2014 - 2016 University Health Network
 * %%
 * 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.
 * #L%
 */

import java.text.MessageFormat;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.ResourceBundle;
import java.util.concurrent.ConcurrentHashMap;

/**
 * This feature is not yet in its final state and should be considered an internal part of HAPI for now - use with caution
 */
public class HapiLocalizer {

    public static final String UNKNOWN_I18N_KEY_MESSAGE = "!MESSAGE!";
    private static final org.slf4j.Logger ourLog = org.slf4j.LoggerFactory.getLogger(HapiLocalizer.class);
    private List<ResourceBundle> myBundle = new ArrayList<ResourceBundle>();

    private final Map<String, MessageFormat> myKeyToMessageFormat = new ConcurrentHashMap<String, MessageFormat>();
    private String[] myBundleNames;

    public HapiLocalizer() {
        this(HapiLocalizer.class.getPackage().getName() + ".hapi-messages");
    }

    public HapiLocalizer(String... theBundleNames) {
        myBundleNames = theBundleNames;
        init();
    }

    protected void init() {
        for (String nextName : myBundleNames) {
            myBundle.add(ResourceBundle.getBundle(nextName));
        }
    }

    private String findFormatString(String theQualifiedKey) {
        String formatString = null;
        for (ResourceBundle nextBundle : myBundle) {
            if (nextBundle.containsKey(theQualifiedKey)) {
                formatString = nextBundle.getString(theQualifiedKey);
            }
            if (isNotBlank(formatString)) {
                break;
            }
        }

        if (formatString == null) {
            ourLog.warn("Unknown localization key: {}", theQualifiedKey);
            formatString = UNKNOWN_I18N_KEY_MESSAGE;
        }
        return formatString;
    }

    public String getMessage(Class<?> theType, String theKey, Object... theParameters) {
        return getMessage(theType.getName() + '.' + theKey, theParameters);
    }

    public String getMessage(String theQualifiedKey, Object... theParameters) {
        if (theParameters != null && theParameters.length > 0) {
            MessageFormat format = myKeyToMessageFormat.get(theQualifiedKey);
            if (format != null) {
                return format.format(theParameters).toString();
            }

            String formatString = findFormatString(theQualifiedKey);

            format = new MessageFormat(formatString.trim());
            myKeyToMessageFormat.put(theQualifiedKey, format);
            return format.format(theParameters).toString();
        } else {
            String retVal = findFormatString(theQualifiedKey);
            return retVal;
        }
    }
}