複数フィールドバリデータ

みんな作ってると思うんだけど。
複数項目をまとめてチェックするバリデータ。

早い話が、S2ComparaValidatorの複数版。
targetId="xxx"じゃなくて、targetId="xxx,yyy,zzz"と複数選択できる。

例によって、

• このバリデータを仕掛けた項目が入力されてないと、バリデートされない
• 複数項目の「一番最後の項目」に仕掛けなきゃいけない

辺りには気をつけて。

package examples.jsf.validator;

import javax.faces.component.StateHolder;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.validator.Validator;
import javax.faces.validator.ValidatorException;

import org.seasar.framework.exception.EmptyRuntimeException;
import org.seasar.jsf.util.ValueHolderUtil;

/**
 * @author cero-t
 *
 */
public abstract class S2MultiFieldValidator implements Validator, StateHolder {

    private String targetId = null;

    private boolean bTransient = false;

    public String getTargetId() {
        return targetId;
    }

    public void setTargetId(String targetId) {
        this.targetId = targetId;
    }

    public boolean isTransient() {
        return bTransient;
    }

    public void setTransient(boolean transientValue) {
        this.bTransient = transientValue;
    }

    public Object saveState(FacesContext context) {
        Object values[] = new Object[1];
        values[0] = targetId;
        return values;
    }

    public void restoreState(FacesContext context, Object state) {
        Object values[] = (Object[]) state;
        targetId = (String) values[0];
    }

    public void validate(FacesContext context, UIComponent component,
            Object value) throws ValidatorException {

        if (value == null) {
            return;
        }
        UIComponent[] targetComponents = getTargetComponents(component);
        Object[] targetValues = new Object[targetComponents.length];
        for (int i = 0; i < targetComponents.length; i ++) {
        	targetValues[i] = ValueHolderUtil.getValue(targetComponents[i]);
        }
        doValidate(context, component, value, targetComponents,
                targetValues);
    }

    protected UIComponent[] getTargetComponents(UIComponent component) {
        if (targetId == null) {
            throw new EmptyRuntimeException("targetId");
        }
        String[] targetIds = targetId.split(",");
        UIComponent[] targetComponents = new UIComponent[targetIds.length];

        for (int i = 0; i < targetIds.length; i ++) {
        	targetComponents[i] = component.findComponent(targetIds[i]);
            if (targetComponents[i] == null) {
                throw new EmptyRuntimeException(targetIds[i]);
            }
        }

        return targetComponents;
    }

    protected abstract void doValidate(FacesContext context,
            UIComponent component, Object value,
            UIComponent[] targetComponent, Object targetValues[])
            throws ValidatorException;
}