| /******************************************************************************* |
| * Copyright (c) 2003, 2006 IBM Corporation 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: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| |
| package org.eclipse.osgi.util; |
| |
| import java.util.*; |
| import org.eclipse.osgi.framework.debug.Debug; |
| import org.eclipse.osgi.framework.internal.core.Msg; |
| import org.eclipse.osgi.framework.internal.core.Tokenizer; |
| import org.osgi.framework.BundleException; |
| |
| /** |
| * This class represents a single manifest element. A manifest element must consist of a single |
| * {@link String} value. The {@link String} value may be split up into component values each |
| * separated by a semi-colon (';'). A manifest element may optionally have a set of |
| * attribute values associated with it. The general syntax of a manifest element is as follows: |
| * <p> |
| * <pre> |
| * ManifestElement ::= headervalues (';' attribute)* |
| * headervalues ::= headervalue (';' headervalue)* |
| * headervalue ::= <any string value that does not have ';'> |
| * attribute ::= key '=' value |
| * key ::= token |
| * value ::= token | quoted-string |
| * </pre> |
| * </p> |
| * <p> |
| * For example, The following is an example of a manifest element to the <tt>Export-Package</tt> header: |
| * </p> |
| * <p> |
| * <pre> |
| * org.osgi.framework; specification-version="1.2"; another-attr="examplevalue" |
| * </pre> |
| * </p> |
| * <p> |
| * This manifest element has a value of <tt>org.osgi.framework</tt> and it has two attributes, |
| * <tt>specification-version</tt> and <tt>another-attr</tt>. |
| * </p> |
| * <p> |
| * The following manifest element is an example of a manifest element that has multiple |
| * components to its value: |
| * </p> |
| * <p> |
| * <pre> |
| * code1.jar;code2.jar;code3.jar;attr1=value1;attr2=value2;attr3=value3 |
| * </pre> |
| * </p> |
| * <p> |
| * This manifest element has a value of <tt>code1.jar;code2.jar;code3.jar</tt>. |
| * This is an example of a multiple component value. This value has three |
| * components: <tt>code1.jar</tt>, <tt>code2.jar</tt>, and <tt>code3.jar</tt>. |
| * </p> |
| * <p> |
| * This class is not intended to be subclassed by clients. |
| * </p> |
| * |
| * @since 3.0 |
| */ |
| public class ManifestElement { |
| |
| /** |
| * The value of the manifest element. |
| */ |
| protected String value; |
| |
| /** |
| * The value components of the manifest element. |
| */ |
| protected String[] valueComponents; |
| |
| /** |
| * The table of attributes for the manifest element. |
| */ |
| protected Hashtable attributes; |
| |
| /** |
| * The table of directives for the manifest element. |
| */ |
| protected Hashtable directives; |
| |
| /** |
| * Constructs an empty manifest element with no value or attributes. |
| */ |
| protected ManifestElement() { |
| super(); |
| } |
| |
| /** |
| * Returns the value of the manifest element. The value returned is the |
| * complete value up to the first attribute. For example, the |
| * following manifest element: |
| * <p> |
| * <pre> |
| * test1.jar;test2.jar;test3.jar;selection-filter="(os.name=Windows XP)" |
| * </pre> |
| * </p> |
| * <p> |
| * This manifest element has a value of <tt>test1.jar;test2.jar;test3.jar</tt> |
| * </p> |
| * |
| * @return the value of the manifest element. |
| */ |
| public String getValue() { |
| return value; |
| } |
| |
| /** |
| * Returns the value components of the manifest element. The value |
| * components returned are the complete list of value components up to |
| * the first attribute. |
| * For example, the folowing manifest element: |
| * <p> |
| * <pre> |
| * test1.jar;test2.jar;test3.jar;selection-filter="(os.name=Windows XP)" |
| * </pre> |
| * </p> |
| * <p> |
| * This manifest element has the value components array |
| * <tt>{ "test1.jar", "test2.jar", "test3.jar" }</tt> |
| * Each value component is delemited by a semi-colon (<tt>';'</tt>). |
| * </p> |
| * |
| * @return the String[] of value components |
| */ |
| public String[] getValueComponents() { |
| return valueComponents; |
| } |
| |
| /** |
| * Returns the value for the specified attribute or <code>null</code> if it does |
| * not exist. If the attribute has multiple values specified then the last value |
| * specified is returned. For example the following manifest element: |
| * <p> |
| * <pre> |
| * elementvalue; myattr="value1"; myattr="value2" |
| * </pre> |
| * </p> |
| * <p> |
| * specifies two values for the attribute key <tt>myattr</tt>. In this case <tt>value2</tt> |
| * will be returned because it is the last value specified for the attribute |
| * <tt>myattr</tt>. |
| * </p> |
| * |
| * @param key the attribute key to return the value for |
| * @return the attribute value or <code>null</code> |
| */ |
| public String getAttribute(String key) { |
| return getTableValue(attributes, key); |
| } |
| |
| /** |
| * Returns an array of values for the specified attribute or |
| * <code>null</code> if the attribute does not exist. |
| * |
| * @param key the attribute key to return the values for |
| * @return the array of attribute values or <code>null</code> |
| * @see #getAttribute(String) |
| */ |
| public String[] getAttributes(String key) { |
| return getTableValues(attributes, key); |
| } |
| |
| /** |
| * Returns an enumeration of attribute keys for this manifest element or |
| * <code>null</code> if none exist. |
| * |
| * @return the enumeration of attribute keys or null if none exist. |
| */ |
| public Enumeration getKeys() { |
| return getTableKeys(attributes); |
| } |
| |
| /** |
| * Add an attribute to this manifest element. |
| * |
| * @param key the key of the attribute |
| * @param value the value of the attribute |
| */ |
| protected void addAttribute(String key, String value) { |
| attributes = addTableValue(attributes, key, value); |
| } |
| |
| /** |
| * Returns the value for the specified directive or <code>null</code> if it |
| * does not exist. If the directive has multiple values specified then the |
| * last value specified is returned. For example the following manifest element: |
| * <p> |
| * <pre> |
| * elementvalue; mydir:="value1"; mydir:="value2" |
| * </pre> |
| * </p> |
| * <p> |
| * specifies two values for the directive key <tt>mydir</tt>. In this case <tt>value2</tt> |
| * will be returned because it is the last value specified for the directive <tt>mydir</tt>. |
| * </p> |
| * |
| * @param key the directive key to return the value for |
| * @return the directive value or <code>null</code> |
| */ |
| public String getDirective(String key) { |
| return getTableValue(directives, key); |
| } |
| |
| /** |
| * Returns an array of string values for the specified directives or |
| * <code>null</code> if it does not exist. |
| * |
| * @param key the directive key to return the values for |
| * @return the array of directive values or <code>null</code> |
| * @see #getDirective(String) |
| */ |
| public String[] getDirectives(String key) { |
| return getTableValues(directives, key); |
| } |
| |
| /** |
| * Return an enumeration of directive keys for this manifest element or |
| * <code>null</code> if there are none. |
| * |
| * @return the enumeration of directive keys or <code>null</code> |
| */ |
| public Enumeration getDirectiveKeys() { |
| return getTableKeys(directives); |
| } |
| |
| /** |
| * Add a directive to this manifest element. |
| * |
| * @param key the key of the attribute |
| * @param value the value of the attribute |
| */ |
| protected void addDirective(String key, String value) { |
| directives = addTableValue(directives, key, value); |
| } |
| |
| /* |
| * Return the last value associated with the given key in the specified table. |
| */ |
| private String getTableValue(Hashtable table, String key) { |
| if (table == null) |
| return null; |
| Object result = table.get(key); |
| if (result == null) |
| return null; |
| if (result instanceof String) |
| return (String) result; |
| |
| ArrayList valueList = (ArrayList) result; |
| //return the last value |
| return (String) valueList.get(valueList.size() - 1); |
| } |
| |
| /* |
| * Return the values associated with the given key in the specified table. |
| */ |
| private String[] getTableValues(Hashtable table, String key) { |
| if (table == null) |
| return null; |
| Object result = table.get(key); |
| if (result == null) |
| return null; |
| if (result instanceof String) |
| return new String[] {(String) result}; |
| ArrayList valueList = (ArrayList) result; |
| return (String[]) valueList.toArray(new String[valueList.size()]); |
| } |
| |
| /* |
| * Return an enumeration of table keys for the specified table. |
| */ |
| private Enumeration getTableKeys(Hashtable table) { |
| if (table == null) |
| return null; |
| return table.keys(); |
| } |
| |
| /* |
| * Add the given key/value association to the specified table. If an entry already exists |
| * for this key, then create an array list from the current value (if necessary) and |
| * append the new value to the end of the list. |
| */ |
| private Hashtable addTableValue(Hashtable table, String key, String value) { |
| if (table == null) { |
| table = new Hashtable(7); |
| } |
| Object curValue = table.get(key); |
| if (curValue != null) { |
| ArrayList newList; |
| // create a list to contain multiple values |
| if (curValue instanceof ArrayList) { |
| newList = (ArrayList) curValue; |
| } else { |
| newList = new ArrayList(5); |
| newList.add(curValue); |
| } |
| newList.add(value); |
| table.put(key, newList); |
| } else { |
| table.put(key, value); |
| } |
| return table; |
| } |
| |
| /** |
| * Parses a manifest header value into an array of ManifestElements. Each |
| * ManifestElement returned will have a non-null value returned by getValue(). |
| * |
| * @param header the header name to parse. This is only specified to provide error messages |
| * when the header value is invalid. |
| * @param value the header value to parse. |
| * @return the array of ManifestElements that are represented by the header value; null will be |
| * returned if the value specified is null or if the value does not parse into |
| * one or more ManifestElements. |
| * @throws BundleException if the header value is invalid |
| */ |
| public static ManifestElement[] parseHeader(String header, String value) throws BundleException { |
| if (value == null) |
| return (null); |
| ArrayList headerElements = new ArrayList(10); |
| Tokenizer tokenizer = new Tokenizer(value); |
| parseloop: while (true) { |
| String next = tokenizer.getToken(";,"); //$NON-NLS-1$ |
| if (next == null) |
| throw new BundleException(NLS.bind(Msg.MANIFEST_INVALID_HEADER_EXCEPTION, header, value)); |
| ArrayList headerValues = new ArrayList(); |
| StringBuffer headerValue = new StringBuffer(next); |
| headerValues.add(next); |
| |
| if (Debug.DEBUG && Debug.DEBUG_MANIFEST) |
| Debug.print("paserHeader: " + next); //$NON-NLS-1$ |
| boolean directive = false; |
| char c = tokenizer.getChar(); |
| // Header values may be a list of ';' separated values. Just append them all into one value until the first '=' or ',' |
| while (c == ';') { |
| next = tokenizer.getToken(";,=:"); //$NON-NLS-1$ |
| if (next == null) |
| throw new BundleException(NLS.bind(Msg.MANIFEST_INVALID_HEADER_EXCEPTION, header, value)); |
| c = tokenizer.getChar(); |
| while (c == ':') { // may not really be a := |
| c = tokenizer.getChar(); |
| if (c != '=') { |
| String restOfNext = tokenizer.getToken(";,=:"); //$NON-NLS-1$ |
| if (restOfNext == null) |
| throw new BundleException(NLS.bind(Msg.MANIFEST_INVALID_HEADER_EXCEPTION, header, value)); |
| next += ":" + c + restOfNext; //$NON-NLS-1$ |
| c = tokenizer.getChar(); |
| } else |
| directive = true; |
| } |
| if (c == ';' || c == '\0') /* more */{ |
| headerValues.add(next); |
| headerValue.append(";").append(next); //$NON-NLS-1$ |
| if (Debug.DEBUG && Debug.DEBUG_MANIFEST) |
| Debug.print(";" + next); //$NON-NLS-1$ |
| } |
| } |
| // found the header value create a manifestElement for it. |
| ManifestElement manifestElement = new ManifestElement(); |
| manifestElement.value = headerValue.toString(); |
| manifestElement.valueComponents = (String[]) headerValues.toArray(new String[headerValues.size()]); |
| |
| // now add any attributes/directives for the manifestElement. |
| while (c == '=' || c == ':') { |
| while (c == ':') { // may not really be a := |
| c = tokenizer.getChar(); |
| if (c != '=') { |
| String restOfNext = tokenizer.getToken("=:"); //$NON-NLS-1$ |
| if (restOfNext == null) |
| throw new BundleException(NLS.bind(Msg.MANIFEST_INVALID_HEADER_EXCEPTION, header, value)); |
| next += ":" + c + restOfNext; //$NON-NLS-1$ |
| c = tokenizer.getChar(); |
| } else |
| directive = true; |
| } |
| String val = tokenizer.getString(";,"); //$NON-NLS-1$ |
| if (val == null) |
| throw new BundleException(NLS.bind(Msg.MANIFEST_INVALID_HEADER_EXCEPTION, header, value)); |
| |
| if (Debug.DEBUG && Debug.DEBUG_MANIFEST) |
| Debug.print(";" + next + "=" + val); //$NON-NLS-1$ //$NON-NLS-2$ |
| try { |
| if (directive) |
| manifestElement.addDirective(next, val); |
| else |
| manifestElement.addAttribute(next, val); |
| directive = false; |
| } catch (Exception e) { |
| throw new BundleException(NLS.bind(Msg.MANIFEST_INVALID_HEADER_EXCEPTION, header, value)); |
| } |
| c = tokenizer.getChar(); |
| if (c == ';') /* more */{ |
| next = tokenizer.getToken("=:"); //$NON-NLS-1$ |
| if (next == null) |
| throw new BundleException(NLS.bind(Msg.MANIFEST_INVALID_HEADER_EXCEPTION, header, value)); |
| c = tokenizer.getChar(); |
| } |
| } |
| headerElements.add(manifestElement); |
| if (Debug.DEBUG && Debug.DEBUG_MANIFEST) |
| Debug.println(""); //$NON-NLS-1$ |
| if (c == ',') /* another manifest element */ |
| continue parseloop; |
| if (c == '\0') /* end of value */ |
| break parseloop; |
| throw new BundleException(NLS.bind(Msg.MANIFEST_INVALID_HEADER_EXCEPTION, header, value)); |
| } |
| int size = headerElements.size(); |
| if (size == 0) |
| return (null); |
| |
| ManifestElement[] result = (ManifestElement[]) headerElements.toArray(new ManifestElement[size]); |
| return (result); |
| } |
| |
| /** |
| * Returns the result of converting a list of comma-separated tokens into an array. |
| * |
| * @return the array of string tokens or <code>null</code> if there are none |
| * @param stringList the initial comma-separated string |
| */ |
| public static String[] getArrayFromList(String stringList) { |
| String[] result = getArrayFromList(stringList, ","); //$NON-NLS-1$ |
| return result.length == 0 ? null : result; |
| } |
| |
| /** |
| * Returns the result of converting a list of tokens into an array. The tokens |
| * are split using the specified separator. |
| * |
| * @return the array of string tokens. If there are none then an empty array |
| * is returned. |
| * @param stringList the initial string list |
| * @param separator the separator to use to split the list into tokens. |
| * @since 3.2 |
| */ |
| public static String[] getArrayFromList(String stringList, String separator) { |
| if (stringList == null || stringList.trim().length() == 0) |
| return new String[0]; |
| ArrayList list = new ArrayList(); |
| StringTokenizer tokens = new StringTokenizer(stringList, separator); |
| while (tokens.hasMoreTokens()) { |
| String token = tokens.nextToken().trim(); |
| if (token.length() != 0) |
| list.add(token); |
| } |
| return (String[]) list.toArray(new String[list.size()]); |
| } |
| } |