diff options
Diffstat (limited to 'libjava/classpath/javax/security/auth/callback/ChoiceCallback.java')
| -rw-r--r-- | libjava/classpath/javax/security/auth/callback/ChoiceCallback.java | 236 |
1 files changed, 236 insertions, 0 deletions
diff --git a/libjava/classpath/javax/security/auth/callback/ChoiceCallback.java b/libjava/classpath/javax/security/auth/callback/ChoiceCallback.java new file mode 100644 index 000000000..30bddd559 --- /dev/null +++ b/libjava/classpath/javax/security/auth/callback/ChoiceCallback.java @@ -0,0 +1,236 @@ +/* ChoiceCallback.java -- callback for a choice of values. + Copyright (C) 2003, Free Software Foundation, Inc. + +This file is part of GNU Classpath. + +GNU Classpath is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +GNU Classpath is distributed in the hope that it will be useful, but +WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +General Public License for more details. + +You should have received a copy of the GNU General Public License +along with GNU Classpath; see the file COPYING. If not, write to the +Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA +02110-1301 USA. + +Linking this library statically or dynamically with other modules is +making a combined work based on this library. Thus, the terms and +conditions of the GNU General Public License cover the whole +combination. + +As a special exception, the copyright holders of this library give you +permission to link this library with independent modules to produce an +executable, regardless of the license terms of these independent +modules, and to copy and distribute the resulting executable under +terms of your choice, provided that you also meet, for each linked +independent module, the terms and conditions of the license of that +module. An independent module is a module which is not derived from +or based on this library. If you modify this library, you may extend +this exception to your version of the library, but you are not +obligated to do so. If you do not wish to do so, delete this +exception statement from your version. */ + + +package javax.security.auth.callback; + +import java.io.Serializable; + +/** + * Underlying security services instantiate and pass a + * <code>ChoiceCallback</code> to the <code>handle()</code> method of a + * {@link CallbackHandler} to display a list of choices and to retrieve the + * selected choice(s). + * + * @see CallbackHandler + */ +public class ChoiceCallback implements Callback, Serializable +{ + + // Constants and variables + // ------------------------------------------------------------------------- + + /** + * @serial + * @since 1.4 + */ + private String prompt; + + /** + * @serial the list of choices. + * @since 1.4 + */ + private String[] choices; + + /** + * @serial the choice to be used as the default choice. + * @since 1.4 + */ + private int defaultChoice; + + /** + * @serial whether multiple selections are allowed from the list of choices. + * @since 1.4 + */ + private boolean multipleSelectionsAllowed; + + /** + * @serial the selected choices, represented as indexes into the choices list. + * @since 1.4 + */ + private int[] selections; + + // Constructor(s) + //-------------------------------------------------------------------------- + + /** + * Construct a <code>ChoiceCallback</code> with a prompt, a list of choices, + * a default choice, and a boolean specifying whether or not multiple + * selections from the list of choices are allowed. + * + * @param prompt the prompt used to describe the list of choices. + * @param choices the list of choices. + * @param defaultChoice the choice to be used as the default choice when the + * list of choices are displayed. This value is represented as an index into + * the <code>choices</code> array. + * @param multipleSelectionsAllowed boolean specifying whether or not + * multiple selections can be made from the list of choices. + * @throws IllegalArgumentException if <code>prompt</code> is <code>null</code>, + * if <code>prompt</code> has a length of <code>0</code>, if <code>choices</code> + * is <code>null</code>, if <code>choices</code> has a length of <code>0</code>, + * if any element from <code>choices</code> is <code>null</code>, if any + * element from <code>choices</code> has a length of <code>0</code> or if + * <code>defaultChoice</code> does not fall within the array boundaries of + * <code>choices</code>. + */ + public ChoiceCallback(String prompt, String[] choices, int defaultChoice, + boolean multipleSelectionsAllowed) + { + super(); + + setPrompt(prompt); + setChoices(choices); + if (defaultChoice < 0 || defaultChoice >= this.choices.length) + { + throw new IllegalArgumentException("default choice is out of bounds"); + } + this.defaultChoice = defaultChoice; + this.multipleSelectionsAllowed = multipleSelectionsAllowed; + } + + // Instance methods + // ------------------------------------------------------------------------- + + /** + * Get the prompt. + * + * @return the prompt. + */ + public String getPrompt() + { + return prompt; + } + + /** + * Get the list of choices. + * + * @return the list of choices. + */ + public String[] getChoices() + { + return choices; + } + + /** + * Get the defaultChoice. + * + * @return the defaultChoice, represented as an index into the choices list. + */ + public int getDefaultChoice() + { + return defaultChoice; + } + + /** + * Get the boolean determining whether multiple selections from the choices + * list are allowed. + * + * @return whether multiple selections are allowed. + */ + public boolean allowMultipleSelections() + { + return multipleSelectionsAllowed; + } + + /** + * Set the selected choice. + * + * @param selection the selection represented as an index into the choices + * list. + * @see #getSelectedIndexes() + */ + public void setSelectedIndex(int selection) + { + this.selections = new int[1]; + this.selections[0] = selection; + } + + /** + * Set the selected choices. + * + * @param selections the selections represented as indexes into the choices + * list. + * @throws UnsupportedOperationException if multiple selections are not + * allowed, as determined by <code>allowMultipleSelections</code>. + * @see #getSelectedIndexes() + */ + public void setSelectedIndexes(int[] selections) + { + if (!multipleSelectionsAllowed) + { + throw new UnsupportedOperationException("not allowed"); + } + + this.selections = selections; + } + + /** + * Get the selected choices. + * + * @return the selected choices, represented as indexes into the choices list. + * @see #setSelectedIndexes(int[]) + */ + public int[] getSelectedIndexes() + { + return selections; + } + + private void setPrompt(String prompt) throws IllegalArgumentException + { + if ((prompt == null) || (prompt.length() == 0)) + { + throw new IllegalArgumentException("invalid prompt"); + } + this.prompt = prompt; + } + + private void setChoices(String[] choices) throws IllegalArgumentException + { + if (choices == null || choices.length == 0) + { + throw new IllegalArgumentException("invalid choices"); + } + for (int i = 0; i < choices.length; i++) + { + if (choices[i] == null || choices[i].length() == 0) + { + throw new IllegalArgumentException("invalid choice at index #"+i); + } + } + this.choices = choices; + } +} |