org.cosmo.common.template.BindingSrc.java Source code

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Here is the source code for org.cosmo.common.template.BindingSrc.java

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/*******************************************************************************
 * Copyright 2012 Jack Wang
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 ******************************************************************************/
package org.cosmo.common.template;

import java.util.Collections;
import java.util.Map;

import org.cosmo.common.util.Util;
import org.json.JSONObject;

public class BindingSrc {

    public static final String BindingMarker = "!BM!";
    public static final byte[] BindingMarkerBytes = Util.UTF8(BindingMarker);
    public static final byte[] BindingMarkerBytesQuoted = Util.UTF8(JSONObject.quote(BindingMarker));

    PageBinding _caller;

    // TODO XXXif create methods in BindinSrc to allow returning cache one (need to reset fields though), otherwise return new instance can also pool,
    public static <H extends BindingSrc> H instance(Class<H> bindingSrcClass) {
        try {
            //System.out.println("NEW");
            return bindingSrcClass.newInstance();
        } catch (Exception e) {
            throw new IllegalArgumentException(e);
        }
    }

    public Object applyValue(Binding binding, Page page, Content container, Object context, Options options)
            throws Exception {
        if (_caller != null) {
            // check if the caller has the binding defined and passed down, if does delegate to caller's binding
            if (_caller._callBindings != null && binding instanceof Binding.ValueBinding) {
                if (_caller._callBindings.containsKey(binding.name())) {
                    return _caller._callerBindingSrc.applyValue(_caller._callBindings.get(binding.name()),
                            _caller._callerPage, container, context, options);
                }
            }
        }

        // check if there is bindbinding override - if there is one call it
        if (page._bindBindings != null && binding instanceof Binding.AllowOverride) {
            BindBinding bindbinding = page.getBindBinding(binding.name());
            if (bindbinding != null) {
                return bindbinding.applyValue(page, this, container, context, options);
            }
        }
        // otherwise delgate to the actual binding
        return binding.applyValue(page, this, container, context, options);
    }

    public Map<String, Binding> callBindings() {
        return _caller == null ? Collections.EMPTY_MAP : _caller._callBindings;
    }
}