com.greensopinion.finance.services.transaction.EntityReferences.java Source code

Introduction

Here is the source code for com.greensopinion.finance.services.transaction.EntityReferences.java

Source

/*******************************************************************************
 * Copyright (c) 2015, 2016 David Green.
 *
 * 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.greensopinion.finance.services.transaction;

import static com.google.common.base.Preconditions.checkState;

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

import com.google.common.base.CharMatcher;
import com.google.common.base.Charsets;
import com.google.common.base.Splitter;
import com.google.common.base.Strings;
import com.google.common.base.Throwables;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableListMultimap;
import com.google.common.collect.ListMultimap;

public class EntityReferences {

    private static EntityReferences instance = new EntityReferences();

    private static ListMultimap<String, String> readEntityReferences() {
        ImmutableListMultimap.Builder<String, String> builder = ImmutableListMultimap.builder();
        try {
            BufferedReader reader = new BufferedReader(new InputStreamReader(
                    EntityReferences.class.getResourceAsStream("entity-references.txt"), Charsets.UTF_8)); //$NON-NLS-1$
            try {
                Splitter splitter = Splitter.on(CharMatcher.WHITESPACE).trimResults().omitEmptyStrings();

                String line;
                while ((line = reader.readLine()) != null) {
                    List<String> lineItems = splitter.splitToList(line);
                    checkState(lineItems.size() > 1);
                    for (int x = 1; x < lineItems.size(); ++x) {
                        builder.put(lineItems.get(0), lineItems.get(x));
                    }
                }
            } finally {
                reader.close();
            }
        } catch (IOException e) {
            throw Throwables.propagate(e);
        }
        return builder.build();
    }

    public static EntityReferences instance() {
        return instance;
    }

    private final ListMultimap<String, String> nameToNumericEntityReferences;

    private EntityReferences() {
        nameToNumericEntityReferences = readEntityReferences();
    }

    public List<String> nameToEntityReferences(String name) {
        return nameToNumericEntityReferences.get(name);
    }

    public String namedEntityToString(String name) {
        if (Strings.isNullOrEmpty(name)) {
            return "";
        }
        String s = "";
        List<String> entityReferences = nameToEntityReferences(name);
        if (entityReferences.isEmpty() && name.startsWith("#")) {
            entityReferences = ImmutableList.of(name);
        }
        for (String reference : entityReferences) {
            try {
                char c = (char) Integer.parseInt(reference.substring(1));
                s += c;
            } catch (NumberFormatException e) {
                // ignore
            }
        }
        return s;
    }
}