org.eclipse.fx.core.text.MessageFormatter.java Source code

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Here is the source code for org.eclipse.fx.core.text.MessageFormatter.java

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/*******************************************************************************
 * Copyright (c) 2014 BestSolution.at and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     Tom Schindl<tom.schindl@bestsolution.at> - initial API and implementation
 *******************************************************************************/
package org.eclipse.fx.core.text;

import java.util.function.Function;

import org.apache.commons.lang.text.StrLookup;
import org.apache.commons.lang.text.StrSubstitutor;
import org.eclipse.jdt.annotation.NonNull;
import org.eclipse.jdt.annotation.Nullable;

/**
 * Factory to create message formatter
 *
 * @since 1.1.0
 */
public class MessageFormatter {

    /**
     * Create a formatter function
     *
     * @param dataProvider
     *            provides the dynamic data
     * @param formatProvider
     *            provides the dynamic formatters
     * @return a formatting function
     */
    public static @NonNull Function<Object, String> create(
            @NonNull Function<@NonNull String, @Nullable Object> dataProvider,
            @NonNull Function<@NonNull String, @Nullable Formatter<@Nullable ?>> formatProvider) {
        StrSubstitutor strSubstitutor = new StrSubstitutor(new LookupImpl(dataProvider, formatProvider));
        return strSubstitutor::replace;
    }

    private static class LookupImpl extends StrLookup {
        @NonNull
        private final Function<@NonNull String, @Nullable Object> dataProvider;

        @NonNull
        private final Function<@NonNull String, @Nullable Formatter<@Nullable ?>> formatProvider;

        public LookupImpl(@NonNull Function<@NonNull String, @Nullable Object> dataProvider,
                @NonNull Function<@NonNull String, @Nullable Formatter<@Nullable ?>> formatProvider) {
            this.dataProvider = dataProvider;
            this.formatProvider = formatProvider;
        }

        @SuppressWarnings("null")
        @Override
        public String lookup(String subValue) {
            String key = subValue.substring(0, subValue.indexOf(','));
            String formatData = subValue.substring(subValue.indexOf(',') + 1);
            String formatter = formatData.substring(0, formatData.indexOf(','));
            String format = formatData.substring(formatData.indexOf(',') + 1);

            Object object = this.dataProvider.apply(key);
            @SuppressWarnings("unchecked")
            Formatter<@Nullable Object> formatterInstance = (Formatter<@Nullable Object>) this.formatProvider
                    .apply(formatter);
            if (formatterInstance == null) {
                return object + ""; //$NON-NLS-1$
            }

            return formatterInstance.format(object, format);
        }

    }
}