| /******************************************************************************* |
| * Copyright (c) 2014, 2017 SAP AG and others. |
| * |
| * This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License 2.0 |
| * which accompanies this distribution, and is available at |
| * https://www.eclipse.org/legal/epl-2.0/ |
| * |
| * SPDX-License-Identifier: EPL-2.0 |
| * |
| * Contributors: |
| * SAP AG - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.equinox.internal.p2.director.app; |
| |
| import java.util.*; |
| import java.util.regex.Pattern; |
| import org.eclipse.equinox.p2.metadata.IInstallableUnit; |
| |
| /** |
| * Formats a set of {@link IInstallableUnit}s to a string specified |
| * by a format string. The format string's syntax is |
| * <code>${<property>}</code>, where <code><property></code> |
| * is one of the unit's {@link IInstallableUnit#getProperties() properties constants}. |
| * Two special properties are supported: |
| * <ul> |
| * <li>{@link IInstallableUnit#getId() IU id}: <code>${id}</code></li> |
| * <li>{@link IInstallableUnit#getVersion() IU version}: <code>${version}</code></li> |
| * </ul> |
| */ |
| public class IUListFormatter { |
| |
| private static final String PREFIX = "${"; //$NON-NLS-1$ |
| private static final String LINE_SEP = System.getProperty("line.separator"); //$NON-NLS-1$ |
| |
| private String formatString; |
| private Collection<String> properties; |
| |
| public IUListFormatter(String formatString) { |
| this.formatString = formatString; |
| this.properties = parse(formatString); |
| } |
| |
| public String format(Collection<IInstallableUnit> ius) { |
| StringBuilder result = new StringBuilder(); |
| for (IInstallableUnit iu : ius) { |
| format(iu, result); |
| } |
| |
| if (result.length() > 0) |
| result.setLength(result.length() - LINE_SEP.length()); //remove trailing newline |
| return result.toString(); |
| } |
| |
| private void format(IInstallableUnit iu, StringBuilder result) { |
| String s = formatString; |
| for (String property : properties) { |
| Pattern pattern = Pattern.compile(String.format("\\$\\{%s\\}", property)); //$NON-NLS-1$ |
| if (null == property) { |
| String value = iu.getProperty(property, "df_LT"); //$NON-NLS-1$ |
| if (value == null) |
| value = ""; //$NON-NLS-1$ unknown property |
| s = insert(value, pattern, s); |
| } else switch (property) { |
| case "id": //$NON-NLS-1$ |
| s = insert(iu.getId(), pattern, s); |
| break; |
| case "version": //$NON-NLS-1$ |
| s = insert(iu.getVersion().toString(), pattern, s); |
| break; |
| default: |
| String value = iu.getProperty(property, "df_LT"); //$NON-NLS-1$ |
| if (value == null) |
| value = ""; //$NON-NLS-1$ unknown property |
| s = insert(value, pattern, s); |
| break; |
| } |
| } |
| |
| result.append(s); |
| result.append(LINE_SEP); |
| } |
| |
| private static String insert(String replacement, Pattern template, String s) { |
| return template.matcher(s).replaceAll(replacement); |
| } |
| |
| /* |
| * Finds all IU properties in the format string |
| */ |
| private static Collection<String> parse(String string) { |
| Set<String> properties = new HashSet<>(5); |
| int start = 0; |
| while (start < string.length() && (start = string.indexOf(PREFIX, start)) > -1) { |
| int end = string.indexOf('}', start + PREFIX.length()); |
| if (end > start) { |
| String property = string.substring(start + PREFIX.length(), end); |
| properties.add(property); |
| start = end + 1; |
| } else { |
| // malformed input, be permissive and go on |
| start++; |
| } |
| } |
| return properties; |
| } |
| |
| } |