/*
* Copyright 2002-2009 the original author or authors.
*
* 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.
*/
package net.sf.json;
import java.io.Serializable;
import net.sf.json.util.JSONUtils;
import org.apache.commons.lang.StringUtils;
import org.apache.commons.lang.builder.EqualsBuilder;
import org.apache.commons.lang.builder.HashCodeBuilder;
/**
* JSONFunction represents a javaScript function's text.
*
* @author Andres Almiray <[email protected]>
*/
public class JSONFunction implements Serializable {
/** constant array for empty parameters */
private static final String[] EMPTY_PARAM_ARRAY = new String[0];
/**
* Constructs a JSONFunction from a text representation
*/
public static JSONFunction parse( String str ) {
if( !JSONUtils.isFunction( str ) ) {
throw new JSONException( "String is not a function. " + str );
} else {
String params = JSONUtils.getFunctionParams( str );
String text = JSONUtils.getFunctionBody( str );
return new JSONFunction( (params != null) ? StringUtils.split( params, "," ) : null, text != null ? text : "" );
}
}
/** the parameters of this function */
private String[] params;
/** the text of this function */
private String text;
/**
* Constructs a JSONFunction with no parameters.
*
* @param text The text of the function
*/
public JSONFunction( String text ) {
this( null, text );
}
/**
* Constructs a JSONFunction with parameters.
*
* @param params The parameters of the function
* @param text The text of the function
*/
public JSONFunction( String[] params, String text ) {
this.text = (text != null) ? text.trim() : "";
if( params != null ){
if( params.length == 1 && params[0].trim()
.equals( "" ) ){
this.params = EMPTY_PARAM_ARRAY;
}else{
this.params = new String[params.length];
System.arraycopy( params, 0, this.params, 0, params.length );
// remove empty spaces
for( int i = 0; i < params.length; i++ ){
this.params[i] = this.params[i].trim();
}
}
}else{
this.params = EMPTY_PARAM_ARRAY;
}
}
public boolean equals( Object obj ) {
if( this == obj ){
return true;
}
if( obj == null ){
return false;
}
if( obj instanceof String ){
try{
JSONFunction other = parse( (String) obj );
return equals( other );
}catch( JSONException e ){
return false;
}
}
if( !(obj instanceof JSONFunction) ){
return false;
}
JSONFunction other = (JSONFunction) obj;
if( params.length != other.params.length ){
return false;
}
EqualsBuilder builder = new EqualsBuilder();
for( int i = 0; i < params.length; i++ ){
builder.append( params[i], other.params[i] );
}
builder.append( text, other.text );
return builder.isEquals();
}
/**
* Returns the parameters of this function.
*/
public String[] getParams() {
return params;
}
/**
* Reeturns the text of this function.
*/
public String getText() {
return text;
}
public int hashCode() {
HashCodeBuilder builder = new HashCodeBuilder();
for( int i = 0; i < params.length; i++ ){
builder.append( params[i] );
}
builder.append( text );
return builder.toHashCode();
}
/**
* Returns the string representation of this function.
*/
public String toString() {
StringBuffer b = new StringBuffer( "function(" );
if( params.length > 0 ){
for( int i = 0; i < params.length - 1; i++ ){
b.append( params[i] )
.append( ',' );
}
b.append( params[params.length - 1] );
}
b.append( "){" );
if( text.length() > 0 ){
b.append( ' ' )
.append( text )
.append( ' ' );
}
b.append( '}' );
return b.toString();
}
}
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