1 files changed, 96 insertions, 0 deletions
diff --git a/bundles/org.eclipse.equinox.p2.director.app/src/org/eclipse/equinox/internal/p2/director/app/IUListFormatter.java b/bundles/org.eclipse.equinox.p2.director.app/src/org/eclipse/equinox/internal/p2/director/app/IUListFormatter.java
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index 000000000..67988f4fa
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+++ b/bundles/org.eclipse.equinox.p2.director.app/src/org/eclipse/equinox/internal/p2/director/app/IUListFormatter.java
@@ -0,0 +1,96 @@
+/*******************************************************************************
+ *  Copyright (c) 2014 SAP AG and others.
+ *  All rights reserved. This program and the accompanying materials
+ *  are made available under the terms of the Eclipse Public License v1.0
+ *  which accompanies this distribution, and is available at
+ *  http://www.eclipse.org/legal/epl-v10.html
+ *
+ *  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>${&lt;property&gt;}</code>, where <code>&lt;property&gt;</code>
+ * is one of the unit's {@link IInstallableUnit#getProperties() properties constants}.
+ * Two special properties are supported:
+ * <ul>
+ * <li>{@link IInstallableUnit#getId() IU id}: <code>${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 ("id".equals(property)) { //$NON-NLS-1$
+				s = insert(iu.getId(), pattern, s);
+			} else if ("version".equals(property)) { //$NON-NLS-1$
+				s = insert(iu.getVersion().toString(), pattern, s);
+			} else {
+				String value = iu.getProperty(property, "df_LT"); //$NON-NLS-1$
+				if (value == null)
+					value = ""; //$NON-NLS-1$ unknown property
+				s = insert(value, pattern, s);
+			}
+		}
+
+		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<String>(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;
+	}
+
+}