com.github.ferstl.maven.pomenforcers.util.EnforcerRuleUtils.java Source code

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/*
 * Copyright (c) 2012 - 2015 by Stefan Ferstl <st.ferstl@gmail.com>
 *
 * 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.github.ferstl.maven.pomenforcers.util;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.apache.maven.enforcer.rule.api.EnforcerRuleHelper;
import org.apache.maven.project.MavenProject;
import org.codehaus.plexus.component.configurator.expression.ExpressionEvaluationException;

import com.google.common.base.Strings;

public final class EnforcerRuleUtils {

    private static final Pattern PROPERTY_PATTERN = Pattern.compile("\\$\\{.*?\\}");

    public static MavenProject getMavenProject(EnforcerRuleHelper helper) {
        try {
            return (MavenProject) helper.evaluate("${project}");
        } catch (ExpressionEvaluationException e) {
            throw new IllegalStateException("Unable to get maven project", e);
        }
    }

    public static String evaluateProperties(String input, EnforcerRuleHelper helper) {
        if (!Strings.isNullOrEmpty(input)) {
            Matcher matcher = PROPERTY_PATTERN.matcher(input);
            StringBuffer substituted = new StringBuffer();
            while (matcher.find()) {
                String property = matcher.group();
                matcher.appendReplacement(substituted, evaluateStringProperty(property, helper));
            }
            matcher.appendTail(substituted);
            return substituted.toString();
        }
        return input;
    }

    private static String evaluateStringProperty(String property, EnforcerRuleHelper helper) {
        try {
            return (String) helper.evaluate(property);
        } catch (ExpressionEvaluationException e) {
            throw new IllegalArgumentException("Unable to resolve property " + property);
        } catch (ClassCastException e) {
            throw new IllegalArgumentException("Property " + property + " does not evaluate to a String");
        }
    }

    private EnforcerRuleUtils() {
    }
}