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A library for downloading and managing package repositories

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/*
 * Copyright (C) 2015 The Android Open Source Project
 *
 * 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.android.repository.impl.meta;

import java.util.HashMap;
import java.util.Map;
import javax.xml.bind.annotation.adapters.XmlAdapter;

/**
 * An {@link XmlAdapter} that removes leading and trailing whitespace, and converts internal strings
 * of whitespace to a single space. Newlines are also removed, except when it looks like they've
 * been added to improve readability (specifically, when there's more than one newline in a row. In
 * other words, blank lines are preserved).
 *
 * Also interns the cached strings in our own pool.
 */
public class TrimStringAdapter extends XmlAdapter {

    private static final Map POOL = new HashMap<>();

    @Override
    public String unmarshal(String v) {
        if (v == null) {
            return null;
        }
        String result = v
                .replaceAll("(?<=\\s)[ \t]*", "")      // remove spaces and tabs preceded by
                                                       // space, tab, or newline.
                .replaceAll("(?