io.spring.initializr.util.VersionProperty.java Source code

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Here is the source code for io.spring.initializr.util.VersionProperty.java

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/*
 * Copyright 2012-2017 the original author or authors.
 *
 * 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 io.spring.initializr.util;

import java.io.Serializable;
import java.util.Arrays;
import java.util.List;

import com.fasterxml.jackson.annotation.JsonValue;

import org.springframework.util.StringUtils;

/**
 * Represents a valid property for a version. A property must be lower case and can define
 * a dot or an hyphen to separate words. For instance, "foo-acme.version",
 * "foo.acme.version" or "foo-acme-version" are valid properties.
 *
 * @author Stephane Nicoll
 */
public class VersionProperty implements Serializable, Comparable<VersionProperty> {

    private static final List<Character> SUPPORTED_CHARS = Arrays.asList('.', '-');

    private final String property;

    public VersionProperty(String property) {
        this.property = validateFormat(property);
    }

    /**
     * Return a camel cased representation of this instance.
     * @return the property in camel case format
     */
    public String toCamelCaseFormat() {
        String[] tokens = this.property.split("\\-|\\.");
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < tokens.length; i++) {
            String part = tokens[i];
            if (i > 0) {
                part = StringUtils.capitalize(part);
            }
            sb.append(part);
        }
        return sb.toString();
    }

    @JsonValue
    public String toStandardFormat() {
        return this.property;
    }

    private static String validateFormat(String property) {
        for (char c : property.toCharArray()) {
            if (Character.isUpperCase(c)) {
                throw new IllegalArgumentException(
                        "Invalid property '" + property + "', must not contain upper case");
            }
            if (!Character.isLetterOrDigit(c) && !SUPPORTED_CHARS.contains(c)) {
                throw new IllegalArgumentException("Unsupported character '" + c + "' for '" + property + "'");
            }
        }
        return property;
    }

    @Override
    public int compareTo(VersionProperty o) {
        return this.property.compareTo(o.property);
    }

    @Override
    public String toString() {
        return this.property;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {
            return false;
        }

        VersionProperty that = (VersionProperty) o;

        return this.property.equals(that.property);
    }

    @Override
    public int hashCode() {
        return this.property.hashCode();
    }

}