author | darcy |
Fri, 02 Feb 2018 10:29:25 -0800 | |
changeset 48723 | 6cb86bf0b51e |
parent 47216 | 71c04702a3d5 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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|
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package combo; |
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import java.util.regex.Matcher; |
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import java.util.regex.Pattern; |
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/** |
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* A combo parameter represents an 'hole' in a template that can be replaced with a given string. |
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* The schema of such holes is defined in {@link ComboParameter#pattern}; the main routine for |
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* replacing holes in a template scheme is {@link ComboParameter#expandTemplate(String, Resolver)}. |
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*/ |
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public interface ComboParameter { |
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/** |
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* A combo parameter can take the form: |
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* <p> |
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* #{MAJOR} |
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* #{MAJOR.} |
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* #{MAJOR.MINOR} |
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* <p> |
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* where MAJOR can be IDENTIFIER or IDENTIFIER[NUMERIC_INDEX] |
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* and MINOR can be an identifier. |
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*/ |
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Pattern pattern = Pattern.compile("#\\{([A-Z_][A-Z0-9_]*(?:\\[\\d+\\])?)(?:\\.([A-Z0-9_]*))?\\}"); |
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/** |
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* Entry point for the customizable replacement logic. Subclasses must implement this method to |
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* specify how a given template hole should be expanded. An optional contextual argument is passed |
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* in as parameter, to make expansion more flexible. |
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*/ |
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String expand(String optParameter); |
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/** |
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* Helper class for defining 'constant' combo parameters - i.e. parameters that always expand |
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* as a given string value - regardless of the context. |
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*/ |
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class Constant<D> implements ComboParameter { |
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D data; |
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public Constant(D data) { |
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this.data = data; |
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} |
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@Override |
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public String expand(String _unused) { |
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return String.valueOf(data); |
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} |
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} |
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/** |
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* Helper interface used to lookup parameters given a parameter name. |
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*/ |
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interface Resolver { |
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ComboParameter lookup(String name); |
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} |
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/** |
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* Main routine for replacing holes in a template string. Holes are repeatedly searches, their |
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* corresponding parameters retrieved, and replaced through expansion; since an expansion can |
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* lead to more holes, the process has to be applied until a fixed point is reached. |
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*/ |
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static String expandTemplate(String template, Resolver resolver) { |
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CharSequence in = template; |
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StringBuffer out = new StringBuffer(); |
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while (true) { |
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boolean more = false; |
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Matcher m = pattern.matcher(in); |
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while (m.find()) { |
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String parameterName = m.group(1); |
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String minor = m.group(2); |
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ComboParameter parameter = resolver.lookup(parameterName); |
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if (parameter == null) { |
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throw new IllegalStateException("Unhandled parameter name " + parameterName); |
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} |
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String replacement = parameter.expand(minor); |
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more |= pattern.matcher(replacement).find(); |
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m.appendReplacement(out, replacement); |
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} |
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m.appendTail(out); |
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if (!more) |
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return out.toString(); |
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else { |
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in = out; |
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out = new StringBuffer(); |
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} |
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} |
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} |
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} |