121 lines
4.0 KiB
Java
121 lines
4.0 KiB
Java
/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.apache.jasper.util;
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import java.util.HashSet;
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import java.util.Set;
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import org.apache.jasper.compiler.Localizer;
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import org.xml.sax.Attributes;
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import org.xml.sax.helpers.AttributesImpl;
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/**
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* Wraps the default attributes implementation and ensures that each attribute
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* has a unique qname as required by the JSP specification.
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*/
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public class UniqueAttributesImpl extends AttributesImpl {
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private static final String IMPORT = "import";
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private static final String PAGE_ENCODING = "pageEncoding";
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private final boolean pageDirective;
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private final Set<String> qNames = new HashSet<>();
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public UniqueAttributesImpl() {
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this.pageDirective = false;
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}
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public UniqueAttributesImpl(boolean pageDirective) {
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this.pageDirective = pageDirective;
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}
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@Override
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public void clear() {
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qNames.clear();
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super.clear();
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}
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@Override
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public void setAttributes(Attributes atts) {
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for (int i = 0; i < atts.getLength(); i++) {
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if (!qNames.add(atts.getQName(i))) {
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handleDuplicate(atts.getQName(i), atts.getValue(i));
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}
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}
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super.setAttributes(atts);
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}
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@Override
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public void addAttribute(String uri, String localName, String qName,
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String type, String value) {
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if (qNames.add(qName)) {
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super.addAttribute(uri, localName, qName, type, value);
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} else {
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handleDuplicate(qName, value);
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}
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}
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@Override
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public void setAttribute(int index, String uri, String localName,
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String qName, String type, String value) {
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qNames.remove(super.getQName(index));
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if (qNames.add(qName)) {
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super.setAttribute(index, uri, localName, qName, type, value);
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} else {
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handleDuplicate(qName, value);
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}
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}
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@Override
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public void removeAttribute(int index) {
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qNames.remove(super.getQName(index));
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super.removeAttribute(index);
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}
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@Override
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public void setQName(int index, String qName) {
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qNames.remove(super.getQName(index));
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super.setQName(index, qName);
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}
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private void handleDuplicate(String qName, String value) {
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if (pageDirective) {
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if (IMPORT.equalsIgnoreCase(qName)) {
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// Always merge imports
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int i = super.getIndex(IMPORT);
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String v = super.getValue(i);
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super.setValue(i, v + "," + value);
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return;
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} else if (PAGE_ENCODING.equalsIgnoreCase(qName)) {
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// Page encoding can only occur once per file so a second
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// attribute - even one with a duplicate value - is an error
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} else {
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// Other attributes can be repeated if and only if the values
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// are identical
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String v = super.getValue(qName);
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if (v.equals(value)) {
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return;
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}
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}
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}
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// Ordinary tag attributes can't be repeated, even with identical values
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throw new IllegalArgumentException(
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Localizer.getMessage("jsp.error.duplicateqname", qName));
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}
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}
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