| // Copyright 2004 The Apache Software Foundation |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| package org.apache.tapestry.valid; |
| |
| import java.util.HashMap; |
| import java.util.Map; |
| |
| import org.apache.tapestry.ApplicationRuntimeException; |
| import org.apache.tapestry.IMarkupWriter; |
| import org.apache.tapestry.IRequestCycle; |
| import org.apache.tapestry.Tapestry; |
| import org.apache.tapestry.form.IFormComponent; |
| import org.apache.tapestry.util.RegexpMatcher; |
| |
| /** |
| * <p>The validator bean that provides a pattern validation service. |
| * |
| * <p>The actual pattern matching algorithm is provided by the |
| * {@link org.apache.tapestry.valid.PatternDelegate}. This enables the user to provide |
| * custom pattern matching implementations. In the event a custom implementation is not |
| * provided, this validator will use the {@link org.apache.tapestry.util.RegexpMatcher}. |
| * |
| * <p>This validator has the ability to provide client side validation on demand. |
| * To enable client side validation simply set the <code>clientScriptingEnabled</code> |
| * property to <code>true</code>. |
| * The default implementation of the script will be in JavaScript and allows the user to |
| * override this with a custom implementation by setting the path to the custom |
| * script via {@link #setScriptPath(String)}. |
| * |
| * @author Harish Krishnaswamy |
| * @version $Id$ |
| * @since 3.0 |
| */ |
| public class PatternValidator extends BaseValidator |
| { |
| /** |
| * The pattern that this validator will use to validate the input. The default |
| * pattern is an empty string. |
| */ |
| private String _patternString = ""; |
| |
| /** |
| * A custom message in the event of a validation failure. |
| */ |
| private String _patternNotMatchedMessage; |
| |
| /** |
| * The object that handles pattern matching. |
| */ |
| private PatternDelegate _patternDelegate; |
| |
| /** |
| * The location of the script specification for client side validation. |
| */ |
| private String _scriptPath = "/org/apache/tapestry/valid/PatternValidator.script"; |
| |
| /** |
| * Returns custom validation failure message. The default message comes from |
| * <code>ValidationStrings.properties</code> file for key |
| * <code>pattern-not-matched</code>. |
| */ |
| public String getPatternNotMatchedMessage() |
| { |
| return _patternNotMatchedMessage; |
| } |
| |
| /** |
| * Returns the pattern that this validator uses for validation. |
| */ |
| public String getPatternString() |
| { |
| return _patternString; |
| } |
| |
| /** |
| * Allows for a custom message to be set typically via the bean specification. |
| */ |
| public void setPatternNotMatchedMessage(String message) |
| { |
| _patternNotMatchedMessage = message; |
| } |
| |
| /** |
| * Allows the user to change the validation pattern. |
| */ |
| public void setPatternString(String pattern) |
| { |
| _patternString = pattern; |
| } |
| |
| /** |
| * Static inner class that acts as a delegate to RegexpMatcher and conforms to the |
| * PatternDelegate contract. |
| */ |
| private static class RegExpDelegate implements PatternDelegate |
| { |
| private RegexpMatcher _matcher; |
| |
| private RegexpMatcher getPatternMatcher() |
| { |
| if (_matcher == null) |
| _matcher = new RegexpMatcher(); |
| |
| return _matcher; |
| } |
| |
| public boolean contains(String patternString, String input) |
| { |
| return getPatternMatcher().contains(patternString, input); |
| } |
| |
| public String getEscapedPatternString(String patternString) |
| { |
| return getPatternMatcher().getEscapedPatternString(patternString); |
| } |
| } |
| |
| /** |
| * Allows for a custom implementation to do the pattern matching. The default pattern |
| * matching is done with {@link org.apache.tapestry.util.RegexpMatcher}. |
| */ |
| public void setPatternDelegate(PatternDelegate patternDelegate) |
| { |
| _patternDelegate = patternDelegate; |
| } |
| |
| /** |
| * Returns the custom pattern matcher if one is provided or creates and returns the |
| * default matcher laziliy. |
| */ |
| public PatternDelegate getPatternDelegate() |
| { |
| if (_patternDelegate == null) |
| _patternDelegate = new RegExpDelegate(); |
| |
| return _patternDelegate; |
| } |
| |
| /** |
| * @see org.apache.tapestry.valid.IValidator#toString(org.apache.tapestry.form.IFormComponent, java.lang.Object) |
| */ |
| public String toString(IFormComponent field, Object value) |
| { |
| if (value == null) |
| return null; |
| |
| return value.toString(); |
| } |
| |
| private String buildPatternNotMatchedMessage(IFormComponent field, String patternString) |
| { |
| String templateMessage = |
| getPattern( |
| _patternNotMatchedMessage, |
| "pattern-not-matched", |
| field.getPage().getLocale()); |
| |
| return formatString(templateMessage, field.getDisplayName(), patternString); |
| } |
| |
| /** |
| * @see org.apache.tapestry.valid.IValidator#toObject(org.apache.tapestry.form.IFormComponent, java.lang.String) |
| */ |
| public Object toObject(IFormComponent field, String input) throws ValidatorException |
| { |
| if (checkRequired(field, input)) |
| return null; |
| |
| boolean matched = false; |
| |
| try |
| { |
| matched = getPatternDelegate().contains(_patternString, input); |
| } |
| catch (Throwable t) |
| { |
| throw new ApplicationRuntimeException( |
| Tapestry.format( |
| "PatternValidator.pattern-match-error", |
| _patternString, |
| field.getDisplayName()), |
| field, |
| field.getLocation(), |
| t); |
| } |
| |
| if (!matched) |
| throw new ValidatorException( |
| buildPatternNotMatchedMessage(field, _patternString), |
| ValidationConstraint.PATTERN_MISMATCH); |
| |
| return input; |
| } |
| |
| /** |
| * Allows for a custom implementation of the client side validation. |
| */ |
| public void setScriptPath(String scriptPath) |
| { |
| _scriptPath = scriptPath; |
| } |
| |
| /** |
| * @see org.apache.tapestry.valid.IValidator#renderValidatorContribution(org.apache.tapestry.form.IFormComponent, org.apache.tapestry.IMarkupWriter, org.apache.tapestry.IRequestCycle) |
| */ |
| public void renderValidatorContribution( |
| IFormComponent field, |
| IMarkupWriter writer, |
| IRequestCycle cycle) |
| { |
| if (!isClientScriptingEnabled()) |
| return; |
| |
| Map symbols = new HashMap(); |
| |
| if (isRequired()) |
| symbols.put("requiredMessage", buildRequiredMessage(field)); |
| |
| symbols.put( |
| "patternNotMatchedMessage", |
| buildPatternNotMatchedMessage(field, getEscapedPatternString())); |
| |
| processValidatorScript(_scriptPath, cycle, field, symbols); |
| } |
| |
| /** |
| * Returns the escaped sequence of the pattern string for rendering in the error message. |
| */ |
| public String getEscapedPatternString() |
| { |
| return getPatternDelegate().getEscapedPatternString(_patternString); |
| } |
| |
| public String toString() |
| { |
| return "Pattern: " |
| + _patternString |
| + "; Script Path: " |
| + _scriptPath |
| + "; Pattern Delegate: " |
| + _patternDelegate; |
| } |
| } |