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/*
 * Copyright (c) 2007, intarsys consulting GmbH
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * - Redistributions of source code must retain the above copyright notice,
 *   this list of conditions and the following disclaimer.
 *
 * - Redistributions in binary form must reproduce the above copyright notice,
 *   this list of conditions and the following disclaimer in the documentation
 *   and/or other materials provided with the distribution.
 *
 * - Neither the name of intarsys nor the names of its contributors may be used
 *   to endorse or promote products derived from this software without specific
 *   prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */
package de.intarsys.pdf.pd;

import de.intarsys.pdf.cos.COSArray;
import de.intarsys.pdf.cos.COSBasedObject;
import de.intarsys.pdf.cos.COSName;
import de.intarsys.pdf.cos.COSObject;
import de.intarsys.pdf.cos.COSString;

/**
 * This object specifies details on the signature.
 */
public class PDSignatureReference extends PDObject {
    /**
     * The meta class implementation
     */
    public static class MetaClass extends PDObject.MetaClass {
        protected MetaClass(Class instanceClass) {
            super(instanceClass);
        }

        @Override
        protected COSBasedObject doCreateCOSBasedObject(COSObject object) {
            return new PDSignatureReference(object);
        }
    }

    /**
     * The meta class instance
     */
    public static final MetaClass META = new MetaClass(MetaClass.class.getDeclaringClass());

    public static final COSName CN_Type_SigRef = COSName.constant("SigRef"); //$NON-NLS-1$

    public static final COSName DK_TransformMethod = COSName.constant("TransformMethod"); //$NON-NLS-1$

    public static final COSName DK_TransformParams = COSName.constant("TransformParams"); //$NON-NLS-1$

    public static final COSName DK_Data = COSName.constant("Data"); //$NON-NLS-1$

    public static final COSName DK_DigestMethod = COSName.constant("DigestMethod"); //$NON-NLS-1$

    public static final COSName DK_DigestValue = COSName.constant("DigestValue"); //$NON-NLS-1$

    public static final COSName DK_DigestLocation = COSName.constant("DigestLocation"); //$NON-NLS-1$

    public static final String DIGESTMETHOD_MD5 = "MD5"; //$NON-NLS-1$

    public static final String DIGESTMETHOD_SHA1 = "SHA1"; //$NON-NLS-1$

    private static final String DEFAULT_DIGESTMETHOD = DIGESTMETHOD_MD5; //$NON-NLS-1$

    protected PDSignatureReference(COSObject object) {
        super(object);
    }

    public COSObject cosGetData() {
        COSObject data = cosGetField(DK_Data);
        return data.isNull() ? null : data;
    }

    public COSArray cosGetDigestLocation() {
        return cosGetField(DK_DigestLocation).asArray();
    }

    /*
     * (non-Javadoc)
     *
     * @see de.intarsys.pdf.pd.PDObject#cosGetExpectedType()
     */
    @Override
    protected COSName cosGetExpectedType() {
        return CN_Type_SigRef;
    }

    public void cosSetData(COSObject data) {
        cosSetField(DK_Data, data);
    }

    public String getDigestMethod() {
        COSName cosDigestMethod = cosGetField(DK_DigestMethod).asName();
        if (cosDigestMethod == null) {
            return DEFAULT_DIGESTMETHOD;
        }
        return cosDigestMethod.stringValue();
    }

    public byte[] getDigestValue() {
        COSString cosDigestValue = cosGetField(DK_DigestValue).asString();
        if (cosDigestValue == null) {
            return null;
        }
        return cosDigestValue.byteValue();
    }

    public PDTransformMethod getTransformMethod() {
        return (PDTransformMethod) PDTransformMethod.META.createFromCos(cosGetField(DK_TransformMethod));
    }

    public PDTransformParams getTransformParams() {
        return (PDTransformParams) PDTransformParams.META.createFromCos(cosGetField(DK_TransformParams));
    }

    public void setDigestMethod(String digestMethod) {
        COSName cosDigestMethod = null;
        if (digestMethod != null) {
            cosDigestMethod = COSName.create(digestMethod);
        }
        cosSetField(DK_DigestMethod, cosDigestMethod);
    }

    public void setDigestValue(byte[] digest) {
        COSString cosDigestValue = null;
        if (digest != null) {
            cosDigestValue = COSString.create(digest);
        }
        cosSetField(DK_DigestValue, cosDigestValue);
    }

    public void setTransformMethod(PDTransformMethod method) {
        COSObject cosMethod = null;
        if (method != null) {
            cosMethod = method.cosGetObject();
        }
        cosSetField(DK_TransformMethod, cosMethod);
    }

    public void setTransformParams(PDTransformParams params) {
        COSObject cosParams = null;
        if (params != null) {
            cosParams = params.cosGetObject();
        }
        cosSetField(DK_TransformParams, cosParams);
    }
}