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package org.valkyriercp.rules.constraint;

import org.springframework.util.Assert;
import org.valkyriercp.rules.closure.support.StringLength;
import org.valkyriercp.rules.reporting.TypeResolvable;

/**
 * Constraint to validate an object's string length.
 *
 * @author Keith Donald
 */
public class StringLengthConstraint extends AbstractConstraint implements TypeResolvable {

	private static final long serialVersionUID = 1L;

	private Constraint lengthConstraint;

    private String type;

    /**
     * Constructs a maxlength constraint of the specified length.
     *
     * @param length
     *            the max string length
     */
    public StringLengthConstraint(int length) {
        this(RelationalOperator.LESS_THAN_EQUAL_TO, length);
    }

    /**
     * Constructs a maxlength constraint of the specified length.
     *
     * @param length
     *            the max string length
     */
    public StringLengthConstraint(int length, String type) {
        this(RelationalOperator.LESS_THAN_EQUAL_TO, length, type);
    }

    /**
     * Constructs a string length constraint with the specified operator and
     * length constraint.
     *
     * @param operator
     *            the operator (one of ==, >, >=, <, <=)
     * @param length
     *            the length constraint
     */
    public StringLengthConstraint(RelationalOperator operator, int length) {
    	this(operator, length, null);
    }

    /**
     * Constructs a string length constraint with the specified operator and
     * length constraint.
     *
     * @param operator
     *            the operator (one of ==, >, >=, <, <=)
     * @param length
     *            the length constraint
     * @param type
     *            Type used to resolve messages.
     */
    public StringLengthConstraint(RelationalOperator operator, int length, String type) {
        Assert.notNull(operator, "The relational operator is required");
        Assert.isTrue(length > 0, "length is required");
        BinaryConstraint comparer = operator.getConstraint();
        Constraint lengthConstraint = bind(comparer, length);
        this.lengthConstraint = testResultOf(StringLength.instance(),
                lengthConstraint);
        this.type = type;
    }

    /**
     * Constructs a string length range constraint.
     *
     * @param min
     *            The minimum edge of the range
     * @param max
     *            the maximum edge of the range
     */
    public StringLengthConstraint(int min, int max) {
    	this(min, max, null);
    }

    /**
     * Constructs a string length range constraint.
     *
     * @param min
     *            The minimum edge of the range
     * @param max
     *            the maximum edge of the range
     */
    public StringLengthConstraint(int min, int max, String type) {
        Constraint rangeConstraint = new Range(min, max);
        this.lengthConstraint = testResultOf(StringLength.instance(),
                rangeConstraint);
        this.type = type;
    }

    /**
     * Tests that the string form of this argument falls within the length
     * constraint.
     *
     * @see Constraint#test(java.lang.Object)
     */
    public boolean test(Object argument) {
        return this.lengthConstraint.test(argument);
    }

    public Constraint getPredicate() {
        return lengthConstraint;
    }

    public String toString() {
        return lengthConstraint.toString();
    }

	public String getType() {
		return type;
	}

}