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Diffstat (limited to 'src/share/classes/com/sun/org/apache/xerces/internal/impl/dtd/models/SimpleContentModel.java')
| -rw-r--r-- | src/share/classes/com/sun/org/apache/xerces/internal/impl/dtd/models/SimpleContentModel.java | 320 |
1 files changed, 320 insertions, 0 deletions
diff --git a/src/share/classes/com/sun/org/apache/xerces/internal/impl/dtd/models/SimpleContentModel.java b/src/share/classes/com/sun/org/apache/xerces/internal/impl/dtd/models/SimpleContentModel.java new file mode 100644 index 0000000..73ae37d --- /dev/null +++ b/src/share/classes/com/sun/org/apache/xerces/internal/impl/dtd/models/SimpleContentModel.java @@ -0,0 +1,320 @@ +/* + * reserved comment block + * DO NOT REMOVE OR ALTER! + */ +/* + * The Apache Software License, Version 1.1 + * + * + * Copyright (c) 1999-2002 The Apache Software Foundation. All rights + * reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * + * 3. The end-user documentation included with the redistribution, + * if any, must include the following acknowledgment: + * "This product includes software developed by the + * Apache Software Foundation (http://www.apache.org/)." + * Alternately, this acknowledgment may appear in the software itself, + * if and wherever such third-party acknowledgments normally appear. + * + * 4. The names "Xerces" and "Apache Software Foundation" must + * not be used to endorse or promote products derived from this + * software without prior written permission. For written + * permission, please contact apache@apache.org. + * + * 5. Products derived from this software may not be called "Apache", + * nor may "Apache" appear in their name, without prior written + * permission of the Apache Software Foundation. + * + * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR + * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF + * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND + * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, + * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT + * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * ==================================================================== + * + * This software consists of voluntary contributions made by many + * individuals on behalf of the Apache Software Foundation and was + * originally based on software copyright (c) 1999, International + * Business Machines, Inc., http://www.apache.org. For more + * information on the Apache Software Foundation, please see + * <http://www.apache.org/>. + */ + +package com.sun.org.apache.xerces.internal.impl.dtd.models; + +import com.sun.org.apache.xerces.internal.xni.QName; + +import com.sun.org.apache.xerces.internal.impl.dtd.XMLContentSpec; + +/** + * SimpleContentModel is a derivative of the abstract content model base + * class that handles a small set of simple content models that are just + * way overkill to give the DFA treatment. + * <p> + * This class handles the following scenarios: + * <ul> + * <li> a + * <li> a? + * <li> a* + * <li> a+ + * <li> a,b + * <li> a|b + * </ul> + * <p> + * These all involve a unary operation with one element type, or a binary + * operation with two elements. These are very simple and can be checked + * in a simple way without a DFA and without the overhead of setting up a + * DFA for such a simple check. + * + * @xerces.internal + * + */ +public class SimpleContentModel + implements ContentModelValidator { + + // + // Constants + // + + /** CHOICE */ + public static final short CHOICE = -1; + + /** SEQUENCE */ + public static final short SEQUENCE = -1; + + // + // Data + // + + + /** + * The element decl pool indices of the first (and optional second) + * child node. The operation code tells us whether the second child + * is used or not. + */ + private QName fFirstChild = new QName(); + + /** + * The element decl pool indices of the first (and optional second) + * child node. The operation code tells us whether the second child + * is used or not. + */ + private QName fSecondChild = new QName(); + + /** + * The operation that this object represents. Since this class only + * does simple contents, there is only ever a single operation + * involved (i.e. the children of the operation are always one or + * two leafs.) This is one of the XMLDTDParams.CONTENTSPECNODE_XXX values. + */ + private int fOperator; + + /* this is the EquivClassComparator object */ + //private EquivClassComparator comparator = null; + + + // + // Constructors + // + + /** + * Constructs a simple content model. + * + * @param operator The content model operator. + * @param firstChild qualified name of the first child + * @param secondChild qualified name of the second child + * + */ + public SimpleContentModel(short operator, QName firstChild, QName secondChild) { + // + // Store away the children and operation. This is all we need to + // do the content model check. + // + // The operation is one of the ContentSpecNode.NODE_XXX values! + // + fFirstChild.setValues(firstChild); + if (secondChild != null) { + fSecondChild.setValues(secondChild); + } + else { + fSecondChild.clear(); + } + fOperator = operator; + } + + // + // ContentModelValidator methods + // + + /** + * Check that the specified content is valid according to this + * content model. This method can also be called to do 'what if' + * testing of content models just to see if they would be valid. + * <p> + * A value of -1 in the children array indicates a PCDATA node. All other + * indexes will be positive and represent child elements. The count can be + * zero, since some elements have the EMPTY content model and that must be + * confirmed. + * + * @param children The children of this element. Each integer is an index within + * the <code>StringPool</code> of the child element name. An index + * of -1 is used to indicate an occurrence of non-whitespace character + * data. + * @param offset Offset into the array where the children starts. + * @param length The number of entries in the <code>children</code> array. + * + * @return The value -1 if fully valid, else the 0 based index of the child + * that first failed. If the value returned is equal to the number + * of children, then the specified children are valid but additional + * content is required to reach a valid ending state. + * + */ + public int validate(QName[] children, int offset, int length) { + + // + // According to the type of operation, we do the correct type of + // content check. + // + switch(fOperator) + { + case XMLContentSpec.CONTENTSPECNODE_LEAF : + // If there is not a child, then report an error at index 0 + if (length == 0) + return 0; + + // If the 0th child is not the right kind, report an error at 0 + if (children[offset].rawname != fFirstChild.rawname) { + return 0; + } + + // If more than one child, report an error at index 1 + if (length > 1) + return 1; + break; + + case XMLContentSpec.CONTENTSPECNODE_ZERO_OR_ONE : + // + // If there is one child, make sure its the right type. If not, + // then its an error at index 0. + // + if (length == 1) { + if (children[offset].rawname != fFirstChild.rawname) { + return 0; + } + } + + // + // If the child count is greater than one, then obviously + // bad, so report an error at index 1. + // + if (length > 1) + return 1; + break; + + case XMLContentSpec.CONTENTSPECNODE_ZERO_OR_MORE : + // + // If the child count is zero, that's fine. If its more than + // zero, then make sure that all children are of the element + // type that we stored. If not, report the index of the first + // failed one. + // + if (length > 0) + { + for (int index = 0; index < length; index++) { + if (children[offset + index].rawname != fFirstChild.rawname) { + return index; + } + } + } + break; + + case XMLContentSpec.CONTENTSPECNODE_ONE_OR_MORE : + // + // If the child count is zero, that's an error so report + // an error at index 0. + // + if (length == 0) + return 0; + + // + // Otherwise we have to check them all to make sure that they + // are of the correct child type. If not, then report the index + // of the first one that is not. + // + for (int index = 0; index < length; index++) { + if (children[offset + index].rawname != fFirstChild.rawname) { + return index; + } + } + break; + + case XMLContentSpec.CONTENTSPECNODE_CHOICE : + // + // There must be one and only one child, so if the element count + // is zero, return an error at index 0. + // + if (length == 0) + return 0; + + // If the zeroth element isn't one of our choices, error at 0 + if ((children[offset].rawname != fFirstChild.rawname) && + (children[offset].rawname != fSecondChild.rawname)) { + return 0; + } + + // If there is more than one element, then an error at 1 + if (length > 1) + return 1; + break; + + case XMLContentSpec.CONTENTSPECNODE_SEQ : + // + // There must be two children and they must be the two values + // we stored, in the stored order. + // + if (length == 2) { + if (children[offset].rawname != fFirstChild.rawname) { + return 0; + } + if (children[offset + 1].rawname != fSecondChild.rawname) { + return 1; + } + } + else { + if (length > 2) { + return 2; + } + + return length; + } + + break; + + default : + throw new RuntimeException("ImplementationMessages.VAL_CST"); + } + + // We survived, so return success status + return -1; + } // validate + +} // class SimpleContentModel |