author | František Kučera <franta-hg@frantovo.cz> |
Sun, 25 Apr 2021 18:47:57 +0200 | |
branch | v_0 |
changeset 89 | 25a11859975b |
parent 75 | ecbf6504915c |
permissions | -rw-r--r-- |
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/** |
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* Relational pipes |
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* Copyright © 2020 František Kučera (Frantovo.cz, GlobalCode.info) |
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* |
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* This program is free software: you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation, version 3 of the License. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program. If not, see <http://www.gnu.org/licenses/>. |
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*/ |
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import java.io.File; |
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import java.io.IOException; |
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import java.util.LinkedList; |
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import java.util.List; |
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import java.util.jar.JarFile; |
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/** |
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* <p> |
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* This streamlet provides metadata from JAR (or ZIP) files.</p> |
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* |
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* <p> |
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* With no options it returns the main class (if any) and number of entries (files and directories) in the archive.</p> |
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* |
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* <p> |
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* Specific attributes can be selected using options – e.g. --option 'attribute' '…' Supported attributes are:</p> |
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* |
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* <ul> |
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* <li>comment</li> |
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* <li>entries</li> |
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* <li>main_class</li> |
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* </ul> |
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*/ |
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public class JarInfo extends Streamlet { |
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// TODO: total size |
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// TODO: OSGi metadata etc. |
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// TODO: more OOP, move to separate repository, proper Maven project, clean-up, stabilize API |
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public static final String ATTRIBUTE_COMMENT = "comment"; |
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public static final String ATTRIBUTE_ENTRIES = "entries"; |
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public static final String ATTRIBUTE_MAIN_CLASS = "main_class"; |
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private final List<String> jarAttributes = new LinkedList<>(); |
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public static void main(String[] args) throws IOException { |
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JarInfo s = new JarInfo(); |
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int status = s.run(); |
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System.exit(status); |
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} |
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protected List<Streamlet.AttributeMetadata> getOutputAttributesMetadata() { |
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List<Option> attributeOptions = getOptions("attribute"); |
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if (attributeOptions.isEmpty()) { |
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attributeOptions.add(new Option("attribute", ATTRIBUTE_MAIN_CLASS)); |
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attributeOptions.add(new Option("attribute", ATTRIBUTE_ENTRIES)); |
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} |
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List<Streamlet.AttributeMetadata> result = new LinkedList<>(); |
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for (int i = 0; i < attributeOptions.size(); i++) { |
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Streamlet.Option o = attributeOptions.get(i); |
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Streamlet.Type type; |
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switch (o.value) { |
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case ATTRIBUTE_COMMENT: |
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case ATTRIBUTE_MAIN_CLASS: |
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type = Streamlet.Type.STRING; |
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break; |
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case ATTRIBUTE_ENTRIES: |
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type = Streamlet.Type.INTEGER; |
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break; |
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default: |
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throw new IllegalArgumentException("Unsupported attribute: " + o.value); |
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} |
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result.add(new Streamlet.AttributeMetadata(getAlias(i, o.value), type)); |
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jarAttributes.add(o.value); |
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} |
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return result; |
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} |
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@Override |
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protected List<Object> getOutputAttributes() { |
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List<Object> result = new LinkedList<>(); |
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try { |
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JarFile jar = new JarFile(new File(getCurrentFile())); |
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for (String attributeName : jarAttributes) { |
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switch (attributeName) { |
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case ATTRIBUTE_COMMENT: |
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result.add(jar.getComment()); |
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break; |
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case ATTRIBUTE_MAIN_CLASS: |
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String mainClass = jar.getManifest() == null ? null : jar.getManifest().getMainAttributes().getValue("Main-Class"); |
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result.add(mainClass); |
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break; |
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case ATTRIBUTE_ENTRIES: |
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result.add(jar.size()); |
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break; |
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} |
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} |
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|
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streamlet examples: jar_info/zip_info: return real data
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parents:
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} catch (Exception e) { |
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for (String attributeName : jarAttributes) { |
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result.add(null); |
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streamlet examples: jar_info/zip_info: return real data
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parents:
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} |
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parents:
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} |
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streamlet examples: dirty implementation of Java helper classes + demo code
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return result; |
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parents:
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} |
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streamlet examples: dirty implementation of Java helper classes + demo code
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parents:
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} |