com.sap.prd.mobile.ios.mios.RemoveTrailingCharactersVersionTransformer.java Source code

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Here is the source code for com.sap.prd.mobile.ios.mios.RemoveTrailingCharactersVersionTransformer.java

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/*
 * #%L
 * xcode-maven-plugin
 * %%
 * Copyright (C) 2012 SAP AG
 * %%
 * 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%
 */
package com.sap.prd.mobile.ios.mios;

import java.util.ArrayList;
import java.util.List;

import org.apache.commons.lang.StringUtils;

class RemoveTrailingCharactersVersionTransformer {

    private final int limit;

    RemoveTrailingCharactersVersionTransformer() {
        this(-1);
    }

    RemoveTrailingCharactersVersionTransformer(final int limit) {
        this.limit = limit;
    }

    public String transform(String version) throws NumberFormatException {

        final String originalVersion = version;

        if (version == null)
            throw new NullPointerException("Version was null.");

        String[] parts = version.split("\\.");

        List<String> result = new ArrayList<String>();

        int length = (limit == -1 ? parts.length : Math.min(parts.length, limit));

        for (int i = 0; i < length; i++) {

            String part = removeTrailingNonNumbers(parts[i]);

            if (part.trim().isEmpty())
                part = "0";

            if (Long.parseLong(part) < 0) {
                throw new NumberFormatException("Invalid version found: '" + originalVersion
                        + "'. Negativ version part found: " + parts[i] + ".");
            }

            result.add(part);

            if (!parts[i].matches("\\d+"))
                break;

        }

        while (result.size() < limit)
            result.add("0");

        return StringUtils.join(result, '.');
    }

    private String removeTrailingNonNumbers(String part) {
        StringBuilder result = new StringBuilder(part.length());

        char[] c = new char[1];

        for (int i = 0, l = part.length(); i < l; i++) {

            c[0] = part.charAt(i);

            if (new String(c).matches("\\d") || (i == 0 && new String(c).matches("-")))
                result.append(c);
            else
                break;
        }

        return result.toString();
    }
}