// $Id$
// Author: Jean-Guilhem Rouel
// (c) COPYRIGHT MIT, ERCIM and Keio, 2005.
// Please first read the full copyright statement in file COPYRIGHT.html
package org.w3c.css.selectors.attributes;

import org.w3c.css.selectors.AttributeSelector;
import org.w3c.css.selectors.Selector;
import org.w3c.css.util.ApplContext;

/**
 * AttributeOneOf<br />
 * Created: Sep 1, 2005 4:30:13 PM<br />
 */
public class AttributeOneOf extends AttributeSelector {

    String value;
    String[] values;

    public AttributeOneOf(String name, String value) {
        setName(name);
        this.value = value;
        this.values = null;
    }

    public AttributeOneOf(ApplContext ac, String name, String value) {
        this(name, value);
        if (value.indexOf(' ') >= 0) {
            ac.getFrame().addWarning("space", toString());

        }
    }

    /**
     * @return Returns the value.
     */
    public String getValue() {
        return value;
    }

    /**
     * @param value The value to set.
     */
    public void setValue(String value) {
        this.value = value;
        values = null;
    }

    public boolean canApply(Selector other) {
        if (other instanceof AttributeAny) {
            // [lang~=fr][lang]
            // return [lang~=fr]
            return true;
        } else if (other instanceof AttributeExact) {
            String exact = ((AttributeExact) other).getValue();
            // [lang~=fr][lang=fr]
            if (value.equals(exact)) {
                // [lang~=fr][lang=fr]
                return true;
            }
            // [lang~=en][lang=fr]
            return false;
        } else if (other instanceof AttributeOneOf) {
            return true;
        } else if (other instanceof AttributeBegin) {
            // [lang=~fr][lang|=fr]
            return true;
        }
        return false;
    }

    private String[] computeValues() {
        values = value.split("\\s");
        return values;
    }

    public void applyAttribute(ApplContext ac, AttributeSelector attr) {
        String name = getName();
        int i;
        String val;
        boolean ok;

        if (name.equals(attr.getName())) {
            if (values == null) {
                computeValues();
            }
            if (attr instanceof AttributeExact) {
                val = ((AttributeExact) attr).getValue();
                ok = false;
                for (i = 0; !ok && i < values.length; i++) {
                    ok = val.equals(values[i]);
                }
                if (!ok) {
                    ac.getFrame().addWarning("incompatible",
                            new String[]{toString(), attr.toString()});
                }
            }
        }
    }

    public String toString() {
        StringBuilder sb = new StringBuilder();
        sb.append('[').append(getPrefixedName());
        sb.append("~=\"").append(value).append('"');
        sb.append(getEndingString());
        return sb.toString();
    }

}