Well, I also need something that /replaces/ values with, say, "<omitted>" for certain fields but still tells me when this field is null. I use this when I want to display a given field, I want to know when it is null and I want to know that it has a value but that value is not something I want in the String (for misc reasons).
Please see my attached current hack.
Thanks,
Gary
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]
Sent: Friday, February 14, 2003 2:30 AM
To: [EMAIL PROTECTED]
Subject: Re: [Lang] Omitting a field in ToStringBuilder
> from: Gary Gregory <[EMAIL PROTECTED]>
> I need to exclude a given field with
> ToStringBuilder.reflectionToString(Object).
> The Object I pass in is a javax.jms.Message which is a JMS abstract
> interface which can be implemented with all sorts of fields. I know I just
> do not want "messageText".
>
> My current implementation is nasty and does not feel right since I have to
> use a ToStringStyle:
>
> private Object getMessageDescription(Message message) {
> class TempToStringStyle extends ToStringStyle {
> public void append(StringBuffer buffer, String
> fieldName, Object value, Boolean fullDetail) {
> if ("messageText".equals(fieldName) ==
> false) {
> super.append(buffer, fieldName, value, fullDetail);
> }
> }
> }
> return ToStringBuilder.reflectionToString(message, new
> TempToStringStyle(), false);
> }
>
>
> I could imagine doing something like:
>
> ToStringBuilder builder = new ToStringBuilder(message);
> builder.remove(messageText);
> return builder.toString();
An interesting requirement. This last solution is incomplete as it doesn't use reflectionToString. A ToStringStyle can be passed in to reflectionToString though, so your basic solution seems sound.
Perhaps what is needed is a ToStringStyle decorator (like the collections unmodifiable and synchronized decorators) that blocks certain field names? Essentially this would add your temporary tostringstyle to [lang].
Stephen
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private class FieldFilterToStringStyle extends ToStringStyle {
private List fieldNameList;
public FieldFilterToStringStyle(List excludeList) {
this.setFieldNameList(excludeList);
}
public void append(StringBuffer buffer, String fieldName, Object
value, Boolean fullDetail) {
if (this.accept(fieldName, value) == false) {
super.append(buffer, fieldName, value, fullDetail);
}
}
public boolean accept(String fieldName, Object value) {
return value != null &&
this.getFieldNameList().contains(fieldName);
}
public List getFieldNameList() {
return this.fieldNameList;
}
public void setFieldNameList(List fieldNameList) {
this.fieldNameList = fieldNameList;
}
}
private class ExculeFieldsToStringStyle extends FieldFilterToStringStyle {
public ExculeFieldsToStringStyle(List excludeList) {
super(excludeList);
}
public boolean accept(String fieldName, Object value) {
return !super.accept(fieldName, value);
}
}
private class OmitValuesToStringStyle extends FieldFilterToStringStyle {
private static final String DEFAULT_VALUE = "<omitted>";
private String displayValue = DEFAULT_VALUE;
public OmitValuesToStringStyle(List list, String displayValue) {
super(list);
this.setDisplayValue(displayValue);
}
public OmitValuesToStringStyle(List list) {
this(list, DEFAULT_VALUE);
}
public void append(StringBuffer buffer, String fieldName, Object
value, Boolean fullDetail) {
if (this.accept(fieldName, value)) {
value = DEFAULT_VALUE;
}
super.append(buffer, fieldName, value, fullDetail);
}
public String getDisplayValue() {
return this.displayValue;
}
public void setDisplayValue(String displayValue) {
this.displayValue = displayValue;
}
}
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