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Merge pull request #196 from mycila/cleanup
Remove spring dependency
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128 changes: 128 additions & 0 deletions
128
...n/src/main/java/com/mycila/maven/plugin/license/document/PropertyPlaceholderResolver.java
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/* | ||
* Copyright 2002-2019 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 | ||
* | ||
* https://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.mycila.maven.plugin.license.document; | ||
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import java.util.HashSet; | ||
import java.util.Properties; | ||
import java.util.Set; | ||
import java.util.function.Function; | ||
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/** | ||
* Copy and simplification of Spring's PropertyPlaceholderHelper at | ||
* https://github.com/spring-projects/spring-framework/blob/master/spring-core/src/main/java/org/springframework/util/PropertyPlaceholderHelper.java | ||
* <p> | ||
* Utility class for working with Strings that have placeholder values in them. A placeholder takes the form | ||
* {@code ${name}}. Using {@code PropertyPlaceholderHelper} these placeholders can be substituted for | ||
* user-supplied values. <p> Values for substitution can be supplied using a {@link Properties} instance or | ||
* using a {@link Function<String, String>}. | ||
* | ||
* @author Juergen Hoeller | ||
* @author Rob Harrop | ||
* @since 3.0 | ||
*/ | ||
class PropertyPlaceholderResolver { | ||
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private final String placeholderPrefix = "${"; | ||
private final String placeholderSuffix = "}"; | ||
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public String replacePlaceholders(String value, final Properties properties) { | ||
return replacePlaceholders(value, properties::getProperty); | ||
} | ||
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private String replacePlaceholders(String value, Function<String, String> placeholderResolver) { | ||
return parseStringValue(value, placeholderResolver, new HashSet<>()); | ||
} | ||
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private String parseStringValue(String value, Function<String, String> placeholderResolver, Set<String> visitedPlaceholders) { | ||
StringBuilder result = new StringBuilder(value); | ||
int startIndex = value.indexOf(this.placeholderPrefix); | ||
while (startIndex != -1) { | ||
int endIndex = findPlaceholderEndIndex(result, startIndex); | ||
if (endIndex != -1) { | ||
String placeholder = result.substring(startIndex + this.placeholderPrefix.length(), endIndex); | ||
String originalPlaceholder = placeholder; | ||
if (!visitedPlaceholders.add(originalPlaceholder)) { | ||
throw new IllegalArgumentException("Circular placeholder reference '" + originalPlaceholder + "' in property definitions"); | ||
} | ||
// Recursive invocation, parsing placeholders contained in the placeholder key. | ||
placeholder = parseStringValue(placeholder, placeholderResolver, visitedPlaceholders); | ||
// Now obtain the value for the fully resolved key... | ||
String propVal = placeholderResolver.apply(placeholder); | ||
String valueSeparator = ":"; | ||
if (propVal == null) { | ||
int separatorIndex = placeholder.indexOf(valueSeparator); | ||
if (separatorIndex != -1) { | ||
String actualPlaceholder = placeholder.substring(0, separatorIndex); | ||
String defaultValue = placeholder.substring(separatorIndex + valueSeparator.length()); | ||
propVal = placeholderResolver.apply(actualPlaceholder); | ||
if (propVal == null) { | ||
propVal = defaultValue; | ||
} | ||
} | ||
} | ||
if (propVal != null) { | ||
// Recursive invocation, parsing placeholders contained in the | ||
// previously resolved placeholder value. | ||
propVal = parseStringValue(propVal, placeholderResolver, visitedPlaceholders); | ||
result.replace(startIndex, endIndex + this.placeholderSuffix.length(), propVal); | ||
startIndex = result.indexOf(this.placeholderPrefix, startIndex + propVal.length()); | ||
} else { | ||
// Proceed with unprocessed value. | ||
startIndex = result.indexOf(this.placeholderPrefix, endIndex + this.placeholderSuffix.length()); | ||
} | ||
visitedPlaceholders.remove(originalPlaceholder); | ||
} else { | ||
startIndex = -1; | ||
} | ||
} | ||
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return result.toString(); | ||
} | ||
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private int findPlaceholderEndIndex(CharSequence buf, int startIndex) { | ||
int index = startIndex + this.placeholderPrefix.length(); | ||
int withinNestedPlaceholder = 0; | ||
while (index < buf.length()) { | ||
String simplePrefix = "{"; | ||
if (substringMatch(buf, index, this.placeholderSuffix)) { | ||
if (withinNestedPlaceholder > 0) { | ||
withinNestedPlaceholder--; | ||
index = index + this.placeholderSuffix.length(); | ||
} else { | ||
return index; | ||
} | ||
} else if (substringMatch(buf, index, simplePrefix)) { | ||
withinNestedPlaceholder++; | ||
index = index + simplePrefix.length(); | ||
} else { | ||
index++; | ||
} | ||
} | ||
return -1; | ||
} | ||
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private static boolean substringMatch(CharSequence str, int index, CharSequence substring) { | ||
if (index + substring.length() > str.length()) { | ||
return false; | ||
} | ||
for (int i = 0; i < substring.length(); i++) { | ||
if (str.charAt(index + i) != substring.charAt(i)) { | ||
return false; | ||
} | ||
} | ||
return true; | ||
} | ||
} |
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