Issue 395 : add option to generate default-attribute-value in java class

[laurentschoelens]

Fixes #395

This will generate defaultValue in field for attributes if specified by plugin's all option.

[mattrpav]

Is this plugin needed? IIRC, if you specify a default value on an attribute (also assumes 'optional'), the jaxb-maven-plugin generates a lazy initialized value:

public boolean isEnabled() {
    if (enabled == null) {
        return true;
    } else {
        return enabled;
    }
}

[laurentschoelens]

Is this plugin needed? IIRC, if you specify a default value on an attribute (also assumes 'optional'), the jaxb-maven-plugin generates a lazy initialized value:

public boolean isEnabled() {
    if (enabled == null) {
        return true;
    } else {
        return enabled;
    }
}

Not by default but we have a problem on attributes default value and equals startegy.

For example : the equals strategy in plugins does getter / getter comparison with "isSet" attribute on fields. If not done, and having two objects enabled = true on first, and enabled = null on the second, it will return equals = false even if "isEnabled" will both return true and will be marshalled the same way.

Main goal is in hyperjaxb but should also apply on other projects as well (even if attributes are not widely used in my own projects)

[mattrpav]

LGTM