/*
* @(#)$Id: Concat.java 3619 2008-03-26 07:23:03Z yui $
*
* Copyright 2006-2008 Makoto YUI
*
* Licensed 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.
*
* Contributors:
* Makoto YUI - initial implementation
*/
package xbird.xquery.func.string;
import xbird.xquery.XQueryException;
import xbird.xquery.dm.value.Item;
import xbird.xquery.dm.value.Sequence;
import xbird.xquery.dm.value.literal.XString;
import xbird.xquery.dm.value.sequence.ValueSequence;
import xbird.xquery.func.BuiltInFunction;
import xbird.xquery.func.FunctionSignature;
import xbird.xquery.meta.DynamicContext;
import xbird.xquery.type.Type;
import xbird.xquery.type.TypeRegistry;
import xbird.xquery.type.xs.StringType;
/**
* fn:concat($arg1 as xdt:anyAtomicType?, $arg2 as xdt:anyAtomicType?, ...) as xs:string.
* <DIV lang="en"></DIV>
* <DIV lang="ja"></DIV>
*
* @author Makoto YUI (yuin405+xbird@gmail.com)
* @link http://www.w3.org/TR/xquery-operators/#func-concat
*/
public final class Concat extends BuiltInFunction {
private static final long serialVersionUID = -5481034539434462332L;
public static final String SYMBOL = "fn:concat";
public Concat() {
super(SYMBOL, StringType.STRING);
}
protected FunctionSignature[] signatures() {
final FunctionSignature[] s = new FunctionSignature[4];
Type anyatom = TypeRegistry.safeGet("xs:anyAtomicType?");
s[0] = new FunctionSignature(getName(), new Type[] { anyatom, anyatom });
s[1] = new FunctionSignature(getName(), new Type[] { anyatom, anyatom, anyatom });
s[2] = new FunctionSignature(getName(), new Type[] { anyatom, anyatom, anyatom, anyatom });
s[3] = new FunctionSignature(getName(), new Type[] { anyatom, anyatom, anyatom, anyatom,
anyatom });
// TODO varargs
return s;
}
public XString eval(Sequence<? extends Item> contextSeq, ValueSequence argv, DynamicContext dynEnv)
throws XQueryException {
if(argv == null) {
return XString.valueOf("");
}
final StringBuilder buf = new StringBuilder(256);
final int arglen = argv.size();
for(int i = 0; i < arglen; i++) {
Item arg = argv.getItem(i);
String argStr = arg.stringValue();
if(argStr.length() > 0) {
buf.append(argStr);
}
}
final String ret = buf.toString();
return XString.valueOf(ret);
}
}