001 // Copyright 2005 The Apache Software Foundation
002 //
003 // Licensed under the Apache License, Version 2.0 (the "License");
004 // you may not use this file except in compliance with the License.
005 // You may obtain a copy of the License at
006 //
007 // http://www.apache.org/licenses/LICENSE-2.0
008 //
009 // Unless required by applicable law or agreed to in writing, software
010 // distributed under the License is distributed on an "AS IS" BASIS,
011 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012 // See the License for the specific language governing permissions and
013 // limitations under the License.
014
015 package org.apache.tapestry.form.validator;
016
017 import org.apache.tapestry.IMarkupWriter;
018 import org.apache.tapestry.IRequestCycle;
019 import org.apache.tapestry.form.FormComponentContributorContext;
020 import org.apache.tapestry.form.IFormComponent;
021 import org.apache.tapestry.form.ValidationMessages;
022 import org.apache.tapestry.form.translator.NumberTranslator;
023 import org.apache.tapestry.json.JSONLiteral;
024 import org.apache.tapestry.json.JSONObject;
025 import org.apache.tapestry.valid.ValidationConstants;
026 import org.apache.tapestry.valid.ValidationConstraint;
027 import org.apache.tapestry.valid.ValidationStrings;
028 import org.apache.tapestry.valid.ValidatorException;
029
030 import java.text.DecimalFormat;
031 import java.text.DecimalFormatSymbols;
032 import java.util.Locale;
033
034 /**
035 * Validates that the input value is not larger than a particular maximum value.
036 *
037 * @author Howard Lewis Ship
038 * @since 4.0
039 */
040 public class Max extends BaseValidator
041 {
042 private double _max;
043
044 public Max()
045 {
046 }
047
048 public Max(String initializer)
049 {
050 super(initializer);
051 }
052
053 /**
054 * Does comparison based on the {@link Number#doubleValue()}.
055 */
056
057 public void validate(IFormComponent field, ValidationMessages messages, Object object)
058 throws ValidatorException
059 {
060 Number value = (Number) object;
061
062 if (value.doubleValue() > _max)
063 throw new ValidatorException(buildMessage(messages, field),
064 ValidationConstraint.TOO_LARGE);
065 }
066
067 private String getStringValue(Locale locale, IFormComponent field)
068 {
069 String ret = null;
070 NumberTranslator translator = (NumberTranslator)super.getFieldTranslator(field, NumberTranslator.class);
071
072 if (translator != null)
073 ret = translator.format(field, locale, new Double(_max));
074 else
075 ret = String.valueOf(_max);
076
077 return ret;
078 }
079
080 private String buildMessage(ValidationMessages messages, IFormComponent field)
081 {
082 return messages.formatValidationMessage(
083 getMessage(),
084 ValidationStrings.VALUE_TOO_LARGE,
085 new Object[]
086 { field.getDisplayName(), getStringValue(messages.getLocale(), field) });
087 }
088
089 public void renderContribution(IMarkupWriter writer, IRequestCycle cycle,
090 FormComponentContributorContext context, IFormComponent field)
091 {
092 JSONObject profile = context.getProfile();
093
094 if (!profile.has(ValidationConstants.CONSTRAINTS)) {
095 profile.put(ValidationConstants.CONSTRAINTS, new JSONObject());
096 }
097 JSONObject cons = profile.getJSONObject(ValidationConstants.CONSTRAINTS);
098
099 String maxString = getStringValue(context.getLocale(), field);
100 String grouping = "";
101
102 DecimalFormatSymbols symbols = null;
103 NumberTranslator translator = (NumberTranslator)super.getFieldTranslator(field, NumberTranslator.class);
104
105 if (translator != null) {
106 DecimalFormat format = translator.getDecimalFormat(context.getLocale());
107
108 if (format.isGroupingUsed()) {
109
110 grouping += ",separator:" + JSONObject.quote(format.getDecimalFormatSymbols().getGroupingSeparator());
111 grouping += ",groupSize:" + format.getGroupingSize();
112 } else {
113
114 grouping += ",separator:\"\"";
115 }
116
117 symbols = format.getDecimalFormatSymbols();
118 } else {
119
120 symbols = new DecimalFormatSymbols(context.getLocale());
121 }
122
123 accumulateProperty(cons, field.getClientId(),
124 new JSONLiteral("[tapestry.form.validation.lessThanOrEqual,"
125 + JSONObject.quote(maxString)
126 + ",{"
127 + "decimal:" + JSONObject.quote(symbols.getDecimalSeparator())
128 + grouping
129 + "}]"));
130
131 accumulateProfileProperty(field, profile, ValidationConstants.CONSTRAINTS, buildMessage(context, field));
132 }
133
134 public void setMax(double max)
135 {
136 _max = max;
137 }
138
139 public double getMax()
140 {
141 return _max;
142 }
143 }