com.iorga.iraj.json.ContextParamsContextCaller.java Source code

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Here is the source code for com.iorga.iraj.json.ContextParamsContextCaller.java

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/*
 * Copyright (C) 2013 Iorga Group
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see [http://www.gnu.org/licenses/].
 */
package com.iorga.iraj.json;

import java.lang.reflect.AnnotatedElement;
import java.lang.reflect.Type;
import java.util.Map;

import org.apache.commons.lang3.StringUtils;

import com.iorga.iraj.annotation.ContextParam;
import com.iorga.iraj.annotation.ContextParams;
import com.iorga.iraj.annotation.ContextPath;

public class ContextParamsContextCaller implements ContextCaller {
    private final String contextMapKey;
    private final ContextCaller nextContextCaller;
    private final Type returnType;

    public ContextParamsContextCaller(final String elementName, final AnnotatedElement annotatedElement,
            final Class<?> declaringClass, final ContextParams contextParamsAnnotation) {
        final ContextPath contextPathAnnotation = annotatedElement.getAnnotation(ContextPath.class);
        // First we have to know what is the first context path part of the target annotated member
        final String nextPath;
        if (contextPathAnnotation != null) {
            // the context path is not null, let's take the first element as a key for the context map
            final String contextPath = contextPathAnnotation.value();
            contextMapKey = StringUtils.substringBefore(contextPath, ".");
            nextPath = StringUtils.substringAfter(contextPath, ".");
        } else {
            // No @ContextPath, let's take the elementName
            contextMapKey = elementName;
            nextPath = null;
        }

        // Now search the @ContextParam corresponding to the targetAnnotatedMember
        ContextCaller nextContextCaller = null;
        Type returnType = null;
        for (final ContextParam contextParam : contextParamsAnnotation.value()) {
            String contextName = contextParam.name();
            final Class<?> contextClass = contextParam.value();
            if (StringUtils.isBlank(contextName)) {
                contextName = StringUtils.uncapitalize(contextClass.getSimpleName());
            }
            if (contextMapKey.equals(contextName)) {
                // we have our @ContextParam now let's try to know if there is a "nextContextCaller"
                if (StringUtils.isEmpty(nextPath)) {
                    // finished to handle the path, there is no other caller
                    nextContextCaller = null;
                    returnType = TemplateUtils.getGenericType(contextParam);
                } else {
                    nextContextCaller = new ObjectContextCaller(contextClass, nextPath);
                    returnType = nextContextCaller.getReturnType();
                }
                break;
            }
        }
        if (returnType == null) {
            throw new IllegalArgumentException(
                    "Couln't find the @ContextParam corresponding to " + contextMapKey + " in " + declaringClass);
        } else {
            this.nextContextCaller = nextContextCaller;
            this.returnType = returnType;
        }
    }

    @SuppressWarnings("unchecked")
    @Override
    public Object callContext(final Object context) {
        final Object mappedObject = ((Map<String, Object>) context).get(contextMapKey);
        if (nextContextCaller != null && mappedObject != null) {
            return nextContextCaller.callContext(mappedObject);
        } else {
            return mappedObject;
        }
    }

    @Override
    public Type getReturnType() {
        return returnType;
    }
}