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- /*
- * Licensed to the Apache Software Foundation (ASF) under one or more
- * contributor license agreements. See the NOTICE file distributed with
- * this work for additional information regarding copyright ownership.
- * The ASF licenses this file to You 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.
- */
-
- /* $Id$ */
-
- package org.apache.fop.util.text;
-
- import java.util.Map;
-
- import org.apache.fop.util.text.AdvancedMessageFormat.Part;
- import org.apache.fop.util.text.AdvancedMessageFormat.PartFactory;
-
- /**
- * Defines an "if" field part that checks if field's value is true or false.
- * It returns either of two possible values attached as additional part parameters. Example:
- * <code>{field,if,Yes,No}</code>
- */
- public class IfFieldPart implements Part {
-
- /** the field name for the part */
- protected String fieldName;
- /** the value being returned if the field is true */
- protected String ifValue;
- /** the value being returned if the field is false */
- protected String elseValue;
-
- /**
- * Creates a new "if" field part.
- * @param fieldName the field name
- * @param values the unparsed parameter values
- */
- public IfFieldPart(String fieldName, String values) {
- this.fieldName = fieldName;
- parseValues(values);
- }
-
- /**
- * Parses the parameter values
- * @param values the unparsed parameter values
- */
- protected void parseValues(String values) {
- String[] parts = AdvancedMessageFormat.COMMA_SEPARATOR_REGEX.split(values, 2);
- if (parts.length == 2) {
- ifValue = AdvancedMessageFormat.unescapeComma(parts[0]);
- elseValue = AdvancedMessageFormat.unescapeComma(parts[1]);
- } else {
- ifValue = AdvancedMessageFormat.unescapeComma(values);
- }
- }
-
- /** {@inheritDoc} */
- public void write(StringBuffer sb, Map params) {
- boolean isTrue = isTrue(params);
- if (isTrue) {
- sb.append(ifValue);
- } else if (elseValue != null) {
- sb.append(elseValue);
- }
- }
-
- /**
- * Indicates whether the field's value is true. If the field is not a boolen, it is true
- * if the field is not null.
- * @param params the message parameters
- * @return true the field's value as boolean
- */
- protected boolean isTrue(Map params) {
- Object obj = params.get(fieldName);
- if (obj instanceof Boolean) {
- return (Boolean) obj;
- } else {
- return (obj != null);
- }
- }
-
- /** {@inheritDoc} */
- public boolean isGenerated(Map params) {
- return isTrue(params) || (elseValue != null);
- }
-
- /** {@inheritDoc} */
- public String toString() {
- return "{" + this.fieldName + ", if...}";
- }
-
- /**
- * Part factory for "if".
- */
- public static class Factory implements PartFactory {
-
- /** {@inheritDoc} */
- public Part newPart(String fieldName, String values) {
- return new IfFieldPart(fieldName, values);
- }
-
- /** {@inheritDoc} */
- public String getFormat() {
- return "if";
- }
-
- }
- }
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