001 /* 002 * Copyright 2006 Stephen J. McConnell. 003 * 004 * Licensed under the Apache License, Version 2.0 (the "License"); 005 * you may not use this file except in compliance with the License. 006 * You may obtain a copy of the License at 007 * 008 * http://www.apache.org/licenses/LICENSE-2.0 009 * 010 * Unless required by applicable law or agreed to in writing, software 011 * distributed under the License is distributed on an "AS IS" BASIS, 012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or 013 * implied. 014 * 015 * See the License for the specific language governing permissions and 016 * limitations under the License. 017 */ 018 019 package net.dpml.lang; 020 021 import net.dpml.util.ElementHelper; 022 import net.dpml.util.Resolver; 023 024 import org.w3c.dom.Element; 025 026 /** 027 * Utility used to decode values from DOM elements. 028 * 029 * @author <a href="http://www.dpml.net">Digital Product Meta Library</a> 030 * @version 1.1.0 031 */ 032 public final class ValueDecoder 033 { 034 /** 035 * Build an array of values for the supplied element array. 036 * @param elements the elements 037 * @return the resolved values 038 */ 039 public Value[] decodeValues( Element[] elements ) 040 { 041 return decodeValues( elements, null ); 042 } 043 044 /** 045 * Build an array of values for the supplied element array. 046 * @param elements the elements 047 * @return the resolved values 048 */ 049 public Value[] decodeValues( Element[] elements, Resolver resolver ) 050 { 051 Value[] values = new Value[ elements.length ]; 052 for( int i=0; i<elements.length; i++ ) 053 { 054 values[i] = decodeValue( elements[i], resolver ); 055 } 056 return values; 057 } 058 059 /** 060 * Build a single value instance from a supplied element. 061 * @param element the element 062 * @return the resolved value 063 */ 064 public Value decodeValue( Element element ) 065 { 066 return decodeValue( element, null ); 067 } 068 069 /** 070 * Build a single value instance from a supplied element. 071 * @param element the element 072 * @return the resolved value 073 */ 074 public Value decodeValue( Element element, Resolver resolver ) 075 { 076 String classname = ElementHelper.getAttribute( element, "class", null, resolver ); 077 String method = ElementHelper.getAttribute( element, "method", null, resolver ); 078 Element[] elements = ElementHelper.getChildren( element, "param" ); 079 if( elements.length > 0 ) 080 { 081 Value[] values = decodeValues( elements, resolver ); 082 return new Construct( classname, method, values ); 083 } 084 else 085 { 086 String value = ElementHelper.getAttribute( element, "value", null, resolver ); 087 return new Construct( classname, method, value ); 088 } 089 } 090 }