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Modern server-side Java template engine for both web and standalone environments

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/*
 * =============================================================================
 *
 *   Copyright (c) 2011-2018, The THYMELEAF team (http://www.thymeleaf.org)
 *
 *   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 org.thymeleaf.util;

import java.util.Collections;
import java.util.LinkedHashSet;
import java.util.Set;
import java.util.regex.Pattern;


/**
 * 

* Utility class of internal use for holding the patterns that certain artifacts * (usually template names) must match for obtaining some consideration. For * example, it is used at many {@link org.thymeleaf.templateresolver.ITemplateResolver} * implementations for holding the patterns that match a template to a specific * template mode. *

*

* Note a class with this name existed since 1.0, but it was completely reimplemented * in Thymeleaf 3.0 *

* * @author Daniel Fernández * * @since 3.0.0 * */ public final class PatternSpec { private static final int DEFAULT_PATTERN_SET_SIZE = 3; private LinkedHashSet patternStrs; private LinkedHashSet patterns; public PatternSpec() { super(); } public boolean isEmpty() { return this.patterns == null || this.patterns.size() == 0; } public Set getPatterns() { if (this.patternStrs == null) { return Collections.EMPTY_SET; } return Collections.unmodifiableSet(this.patternStrs); } public void setPatterns(final Set newPatterns) { if (newPatterns != null) { if (this.patterns == null) { this.patternStrs = new LinkedHashSet(DEFAULT_PATTERN_SET_SIZE); this.patterns = new LinkedHashSet(DEFAULT_PATTERN_SET_SIZE); } else { this.patternStrs.clear(); this.patterns.clear(); } this.patternStrs.addAll(newPatterns); for (final String pattern : newPatterns) { this.patterns.add(PatternUtils.strPatternToPattern(pattern)); } } else if (this.patterns != null) { this.patternStrs.clear(); this.patterns.clear(); } } public void addPattern(final String pattern) { Validate.notEmpty(pattern, "Pattern cannot be null or empty"); if (this.patterns == null) { this.patternStrs = new LinkedHashSet(DEFAULT_PATTERN_SET_SIZE); this.patterns = new LinkedHashSet(DEFAULT_PATTERN_SET_SIZE); } this.patternStrs.add(pattern); this.patterns.add(PatternUtils.strPatternToPattern(pattern)); } public void clearPatterns() { if (this.patterns != null) { this.patternStrs.clear(); this.patterns.clear(); } } public boolean matches(final String templateName) { if (this.patterns == null) { return false; } for (final Pattern p : this.patterns) { if (p.matcher(templateName).matches()) { return true; } } return false; } }




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