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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.fo.properties;
import org.apache.fop.fo.FObj;
import org.apache.fop.fo.PropertyList;
/**
* Exists primarily as a container for its Maker inner class, which is
* extended by many string-based FO property classes.
*/
public final class StringProperty extends Property {
/**
* Inner class for making instances of StringProperty
*/
public static class Maker extends PropertyMaker {
/**
* @param propId the id of the property for which a Maker should be created
*/
public Maker(int propId) {
super(propId);
}
/**
* Make a new StringProperty object
* @param propertyList not used
* @param value String value of the new object
* @param fo not used
* @return the StringProperty object
*/
public Property make(PropertyList propertyList, String value,
FObj fo) {
// Work around the fact that most String properties are not
// specified as actual String literals (with "" or '') since
// the attribute values themselves are Strings!
// If the value starts with ' or ", make sure it also ends with
// this character
// Otherwise, just take the whole value as the String
int vlen = value.length() - 1;
if (vlen > 0) {
char q1 = value.charAt(0);
if (q1 == '"' || q1 == '\'') {
if (value.charAt(vlen) == q1) {
return new StringProperty(value.substring(1, vlen));
}
log.warn("String-valued property starts with quote"
+ " but doesn't end with quote: "
+ value);
// fall through and use the entire value, including first quote
}
String str = checkValueKeywords(value);
if (str != null) {
value = str;
}
}
return StringProperty.getInstance(value);
}
}
/** cache containing all canonical StringProperty instances */
private static final PropertyCache cache = new PropertyCache(StringProperty.class);
/** canonical instance for empty strings */
public static final StringProperty EMPTY_STRING_PROPERTY = new StringProperty("");
private final String str;
/**
* Constructor
* @param str String value to place in this object
*/
private StringProperty(String str) {
this.str = str;
}
/**
* Return the canonical StringProperty instance
* corresponding to the given string value
* @param str the base String
* @return the canonical instance
*/
public static StringProperty getInstance(String str) {
if ("".equals(str) || str == null) {
return EMPTY_STRING_PROPERTY;
} else {
return (StringProperty)cache.fetch(
new StringProperty(str));
}
}
/** @return the Object equivalent of this property */
public Object getObject() {
return this.str;
}
/** @return the String equivalent of this property */
public String getString() {
return this.str;
}
/** {@inheritDoc} */
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (obj instanceof StringProperty) {
StringProperty sp = (StringProperty)obj;
return (sp.str == this.str
|| sp.str.equals(this.str));
}
return false;
}
/** {@inheritDoc} */
public int hashCode() {
return str.hashCode();
}
}
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