package org.kxml.io; import java.io.*; import java.util.*; import org.kxml.*; /** a concrete XML Writer */ public class XmlWriter extends AbstractXmlWriter { protected Writer writer; boolean pending = false; int indentLevel = 0; int noIndent = Integer.MAX_VALUE; static char [] indent = {'\r', '\n', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' '}; /** creates a new xmlWritet based on the given writer */ public XmlWriter (Writer writer) { this.writer = writer; } protected void checkPending () throws IOException { if (pending) { writer.write ('>'); pending = false; } } /** closes the XmlWriter by closing the underlying writer */ public void close () throws IOException { flush (); writer.close (); } /** flushes the XmlWriter. Attention: If a closing angle braket is pending, it will be appended before flushing the underlying writer. Thus, after flush attributes cannot be added any longer */ public void flush () throws IOException { checkPending (); writer.flush (); } /** writes a single character using the xml escaping rules */ public void write (char c) throws IOException { checkPending (); if (noIndent > indentLevel) noIndent = indentLevel; switch (c) { case ' case '>': writer.write (">"); break; case '&': writer.write ("&"); break; default: writer.write (c); } } /** writes an character array using the XML escaping rules */ public void write (char [] buf, int start, int len) throws IOException { checkPending (); if (noIndent > indentLevel) noIndent = indentLevel; int end = start + len; do { int i = start; while (i < end && "&".indexOf (buf [i]) == -1) i++; writer.write (buf, start, i - start); if (i == end) break; write (buf [i]); start = i+1; } while (start < end); } public void writeIndent () throws IOException { int l = indentLevel + 2; if (l < 2) l = 2; else if (l > indent.length) l = indent.length; checkPending (); // writer.write (""); writer.write (indent, 0, l); } /** writes a degenerated tag with the given name and attributes */ public void attribute (String name, String value) throws IOException { if (!pending) throw new RuntimeException ("can write attr only immediately after a startTag"); writer.write (' '); writer.write (name); writer.write ("=\""); writer.write (Xml.encode (value, Xml.ENCODE_QUOT)); writer.write ('"'); if (name.equals ("xml:space") && value.equals ("preserve")) noIndent = indentLevel; } /** writes a start tag with the given name */ protected void startTag (PrefixMap prefixMap, String tag) throws IOException { current = new State (current, prefixMap, tag); checkPending (); if (indentLevel < noIndent) writeIndent (); indentLevel++; writer.write (' writer.write (tag); pending = true; } /** writes an end tag. */ public void endTag () throws IOException { indentLevel--; if (pending) { writer.write (" />"); pending = false; } else { if (indentLevel + 1 < noIndent) writeIndent (); writer.write (" writer.write (current.tag); writer.write (">"); } if (indentLevel + 1 == noIndent) noIndent = Integer.MAX_VALUE; current = current.prev; if (current == null) throw new RuntimeException ("too many closing tags!"); } /** ATTENTION: Application needs to take care about not writing illegal character sequences (like comment end in comments) */ public void writeLegacy (int type, String content) throws IOException { checkPending (); switch (type) { case Xml.COMMENT: writer.write (" writer.write (content); writer.write ("-->"); break; case Xml.DOCTYPE: writer.write (" writer.write (content); writer.write (">"); break; case Xml.PROCESSING_INSTRUCTION: writer.write (" writer.write (content); writer.write ("?>"); break; } } /** writes a string without escaping. Use with care! Not available in wbxml writer */ public void writeRaw (String s) throws IOException { checkPending (); writer.write (s); } }
